Pi brohure

a new generation of instruments
Company Overview

Own Products
•Dissolved Oxygen
•Suspended Solids
•Residual Chlorine
•Residual Ozone
•Chlorine Dioxide
•pH/ORP(Redox)
•Swimming Pool and Spa
Controllers
•De-watering Polymer Control
•Biofilm Control
•Conductivity

CRIUS®
HaloSense
• High Quality and Multilingual
• Low Cost
• Colour Display and Keypad
• Sophisticated Comms and Control
• All CRONOS options plus:
– texting alarms
– remote internet access
– datalogging
– PID control
– automatic cleaning
– automatic calibration
– up to 6 sensors and outputs
– integrated flow control
OxySense - Dissolved Oxygen Meter
The OxySense range of online DO meters utilises the very latest and best optical DO sensor available in the world today. It is
an optical luminescent device which is extremely resistant to abrasion, extremely stable, and has greatly reduced
maintenance and whole life costs.
● No chemicals or moving parts
● Optional self-cleaning sensor and self-verification
● Stable and reliable - excellent process control
● Suitable for all Dissolved Oxygen applications
● Up to 12 months between maintenance
● Up to 12 months between calibration
The OxySense optical sensor is available with different controllers giving you the same great performance with different
communication, display, and control options. With the OxySense range of online DO meters, you get everything that you need
- and nothing that you don't.
For more information please see
the individual brochure -
CRONOS®
, CRIUS®
and CRATOS
CRONOS®
OxySense
• Lowest Purchase Cost
• Up to 3 sensors
• Options include:
– up to 3 4-20mA outputs
– up to 4 relays (solid state or
mechanical)
– modbus TCP
– modbus ASCII/RTU
– profibus
– HART
– flow switch input
– PID control
CRATOS OxySense
• Medium Cost
• Colour Touchscreen
• Up to 12 sensors
• Datalogging
• All CRONOS® and CRIUS® options
plus:
– lowest cost per point
CRIUS®
OxySense
• Low Cost
• Datalogging
• Up to 6 sensors
• All CRONOS® options plus:
– texting alarms
"Simply the best DO
sensor I've used"
Jon Shan, USA

Specification
Type: Lumiphore Optical Dissolved Oxygen
Measurand: Dissolved Oxygen
Range: 0-20mg/l or 0-450% Saturation
Resolution: 0.01mg/l
Accuracy and Precision: ±0.1mg/l from 0-8mg/l (1.25%) and ±0.2mg/l from 8-20mg/l
Stability: Better than 1% per month (without calibration)
Temperature Range: >0 up to 50°c
pH-range: pH2 up to pH10
Salinity Range: 0-42ppt
Temperature Compensation: Automatically by an integrated thermistor
Permissible Overpressure: 0.5 bar
Typical Response Limited: >25mg/l
Response Time: T90=30s, T95=37s
Zero-point Adjustment: Not necessary
Calibration: Manual using water saturated air
Material of Construction: PVC, silicone, polycarbonate, stainless steel
Dimensions: Diameter approx. 43.7mm OD, length 203mm
Maintenance intervals: Manual calibration 3-12 months, lumiphore change 12 months
Warranty: The shorter of 24 months from the date of manufacture or 12 months from date of first use
Interferences: High levels of hypochlorite
®RDO is a registered trademark of In Situ Inc. Boulder Colorado
Principle of Operation
The sensing element (lumiphore) is activated, or excited
when illuminated with a blue light. When activated, the
lumiphore then emits blue light in an intensity that is
inversely proportional to the amount of oxygen present in
the water. There is also a time delay between the peak
emission of blue light and peak response of fluoresced red
light. The amount of delay is inversely proportional to the
amount of oxygen present. This time delay can be
expressed as a phase shift between the wave patterns of
incident blue light and the fluoresced red light. This is in
turn reported by the electronics into a ppm or mg/l reading
of Dissolved Oxygen. The advantages of this technology
are that it is more stable than traditional electrochemical
devices and far more resistant to abrasion. By using the
state of the art sensor and electronics together the
reliability, accuracy, and flexibility of the OxySense Meter is
far superior to that of its competitors.
Autoclean and Auto-verification
The OxySense Meter is the first of its kind in the world to
offer automatic in situ sensor verification as an option. The
OxySense is able to reduce maintenance by automatically
checking it’s sensor operation at user defined time
intervals. Calibration on the In-Situ sensor is normally
required only once per annum so with the automatic sensor
verification option and the self clean option the sensor may
not need to be inspected at all for a full year.

CRIUS®
HaloSense
• Low Cost
– texting alarms
– datalogging
– PID control
SoliSense®
- Turbidity and Suspended Solids Monitor
With the SoliSense® range of Suspended Solids/Turbidity analyzers you get a world's first sensor. The first sensor to
successfully incorporate four measuring technologies. For multiple measuring ranges the one sensor can monitor Turbidity
and Suspended Solids from 0.02 NTU to 8% solids in one sensor. A less expensive SoliSense® is available for 0-10 NTU.
● Autoclean optical sensor
● Suitable for all potable, waste and process waters
● From 0.02 NTU to 8% Solids
The SoliSense® sensors are available with different controllers giving you the same great performance with different
communication, display, and control options. With the SoliSense range of suspended solids meters, you get everything that
you need - and nothing that you don't, without sacrificing the quality of measurement.
CRONOS®
, CRIUS®
and CRATOS
CRONOS®
SoliSense®
• Up to 3 sensors
mechanical)
– modbus TCP
– profibus
– HART
– PID control
CRATOS SoliSense®
• Medium Cost
• Datalogging
plus:
CRIUS®
SoliSense®
• Low Cost
• Datalogging
• Up to 6 sensors
– texting alarms via GSM
– remote internet access via
GPRS

Multi-beam Technology
Each probe is equipped with 2 light sources and 4
detectors. Each light source uses long-life emitters (at least
20,000 operating hours), and these are turned off when not
required to conserve energy and extend the life.
By using multiple light emitters and detectors in a single
probe it is possible to:
• Measure solids from 0.02 NTU to 8% solids
• Monitor and compensate for fouling of the optics
• Monitor and compensate for aging of the optics
• Measure the forward scattering of light (low NTU
values)
• Measure the side scattering of light
(ISO7027 requires a 90° side scatter
measurement). (NTU)
• Measure transmitted light (low % solids)
• Measure the back scatter of light (higher % solids)
The electronics provide a fully scalable output allowing the
CRIUS® SoliSense® to measure any part, or the whole of
the scale from 0.02 NTU to 8% solids. The sensor probe
comes equipped with the capability of having a water jet
regularly sweep over the optical lenses keeping them clean.
If you have an application that ranges from low NTU all the
way to %age solids then the CRIUS® SoliSense® is
certainly the monitor for you! With only 3 or 4 calibration
points you can accurately monitor your process all the way
from low NTU to 8% solids.
Specification
Signal: The SoliSense® sensor provides up to four user selectable
outputs, which are proportional to the measured concentration
range selected
Range: Selectable
Accuracy: < 1% of measuring range end value
Reproducibility: 0.5 %
Weight: Installation type ca. 1.5kg Immersion type ca. 0.5kg
Comms: TCP/IP, Modbus, RS232, RS485, 4-20mA
Power supply: 100-250 V AC, 50/60 Hz 8-36 V DC
Ambient temperature: -20 to +50°C
Process temperature: 0-50°C
Lamp Source: IR LED
Housing Materials: Wetted parts, stainless steel, quartz glass, and polypropylene
Cleaning Cycles: User settable cleaning cycle time and cleaning time
Cleaning: Autoclean water or air jet
Reliability: Simplified design with no moving parts
Durability: Hard-wearing stainless steel/epoxy/quartz glass
Pipe Options: Pipe connection, pipe insertion or immersion versions to
suit individual applications
Enclosure rating: IP65
Display: Value and Alarms at the same time, controller dependent
SoliSense Installation
The probes are stainless steel and are built to work in the
demanding environment of a WwTW. If you want to monitor
solids at any point in your waste water treatment plant, this
instrument has the self cleaning sensor and accessories to
do it, even if other instruments have failed.
By Pass
Insertion
Dip

CRIUS®
HaloSense
• Low Cost
– texting alarms
– datalogging
– PID control
HaloSense - Total and Free Chlorine Analyzer
CRONOS®
, CRIUS®
and CRATOS
CRONOS®
HaloSense
• Up to 3 sensors
– pH compensation
– optical isolation for I/O
mechanical)
– modbus TCP
– profibus
– HART
– PID control
CRATOS HaloSense
• Medium Cost
• Datalogging
plus:
CRIUS®
HaloSense
• Low Cost
• Datalogging
• Up to 6 sensors
– texting alarms via GSM
– remote internet access via
GPRS
"In my opinion the Pi chlorine
analysers are simply the best in the
world" John Clark, USA
The HaloSense range of Chlorine Analysers, Residual Chlorine Controllers and Chlorine Monitors utilise the very latest and
best chlorine sensors available in the world today. They are membrane devices which are insensitive to changing pH, use no
reagents, are extremely stable, and have reduced maintenance and reduced whole life costs.
● Amperometric sensors - accepted under US EPA method 334.0
● No chemical reagents - lower cost of ownership
● Suitable for all potable, process and salt waters
The HaloSense sensors and flow cells are available with different controllers giving you the same great performance with
different communication, display, and control options. With the HaloSense range of residual chlorine analyzers, you get
everything that you need - and nothing that you don't.

Specification
Chlorine Sensor Probe
Type: Membrane covered potentiostatic chrono amperometric three-electrode system
Measurand: Total Chlorine or Free Chlorine
Range: 0.01-1, 0.01-2, 0.01-5, 0.01-10mg/l (ppm 0-200mg/lppm)*2
Resolution: 0.01mg/l (ppm)
Reproducibility: ±5 %
Stability: -2 % per month (without calibration)
Working electrode: Gold
Counter electrode: Stainless Steel
Reference electrode: Silver / silver halide
Membrane material: Micro-porous hydrophillic membrane
Flow rate: Approximately 0.5l/min (min 0.2l/min)
Temperature range: >0 to <50°c
Temperature compensation: Automatically by an integrated thermistor
pH-range: pH 4 up to pH 9
First-polarisation time: 120 min
Re-polarisation time: 30 min
Response time: T90: approx.120 seconds
Zero-point adjustment: Not necessary
Calibration: Manual using DPD or Automatic
Housing material: PVC, silicone, polycarbonate stainless steel
Dimensions: Diameter approx. 25mm, length 175mm
Maintenance intervals:
Membrane: 12-18 months
Electrolyte: 3-6 months
Interferences: High levels of other oxidants such as Ozone and Chlorine Dioxide
*2 The 0-200mg/l sensor is a 2 electrode sensor that is sensitive to pH variation
The membraned amperometric chlorine sensors, are
enhanced with a third, reference electrode*1 which
eliminates zero drift. Its unique design means that pH
correction is not usually required at all, completely
eliminating reagents.
In addition to the state of the art potentiostatic chrono-
amperometric free chlorine and total chlorine sensors, the
HaloSense range of residual chlorine analyzers has all the
functionality that you need, and more. Simply choose the
CRONOS, CRIUS® or CRATOS controller to give you the
highest quality chlorine monitor, with all the functionality you
need at the lowest price possible. This means that you pay
for everything that you need and nothing you don't, without
sacrificing the quality of measurement!
Autoflush and AutoCal
As described in seperate brochures, the HaloSense can
come equipped to automatically clean itself or calibrate at
user defined intervals with all the benefits of no operator
intervention for 6 months. The Autoflush is particularly useful
in food preparation, pulp and paper, and many applications
where there is likely to be a build up of solids in the sample.
The AutoCal is used to give completely operator free
operation for up to 6 months.
Water Treatment
• Chlorine Dosing
• Remote Sites
• Cooling Towers
• Food Preparation
• Paper Mills
• Secondary Chlorination
Anywhere you have a requirement to measure residual free
or total chlorine is a suitable application for the HaloSense.
The HaloSense chlorine monitor range is particularly suited
to working in sites where reliability and ease of use are most
important.
pH Compensation
For some applications with high and variable pH, pH
compensation can improve the accuracy of the chlorine
readings. For pH compensation to be valid it must be done
with the highest quality pH sensors and with chlorine
sensors that have a reduced susceptibility to varying pH,
such as those used in the HaloSense range of chlorine
analyzers.*1
*1 For more details please see technical notes

CRIUS®
HaloSense
• Low Cost
– texting alarms
– datalogging
– PID control
OzoSense - Residual Ozone Analyzer
The OzoSense range of Ozone Analyzers, Ozone Controllers and Ozone Monitors utilise the very latest and best ozone
sensors available in the world today. They are membrane devices which are insensitive to changing pH, use no reagents, are
extremely stable, and have reduced maintenance and reduced whole life costs.
● Suitable for all potable, process and salt waters
● Does not respond to residual chlorine
● Resistant to detergents in the water
The OzoSense sensors and flow cells are available with different controllers giving you the same great performance with
different communication, display, and control options. With the OzoSense range of residual ozone analyzers, you get
everything that you need - and nothing that you don't, saving money without compromising the quality of measurement.
CRONOS®
, CRIUS®
and CRATOS
CRONOS®
OzoSense
• Up to 3 sensors
mechanical)
– modbus TCP
– profibus
– HART
– PID control
CRATOS OzoSense
• Medium Cost
• Datalogging
plus:
CRIUS®
OzoSense
• Low Cost
• Datalogging
• Up to 6 sensors
– texting alarms
"We have had excellent success with Pi's Ozone
Analysers" Kahraman Kalyoncu, Turkey

Specifications
Ozone Sensor Probe
Type: Membraned covered amperometric
polarographic two-electrode system
Measurand: Residual Ozone O3
Range: 0-05-0.2, 0.05-2, 0.05-5, 0.05-10
mg/l(ppm)
Resolution: 0.01mg/l (1 ppb)
Reproducibility: ±5%
Stability: -1% per month (without calibration)
Working Electrode: Cathode made of gold
Counter Electrode: Silver /silver halide
Membrane Material: Micro-porous hydrophillic membrane
Flow Rate: Approx 0.5 l/min (min 0.2 l/min)
Temperature Range: >0 up to 50°c
Temperature Comp: Automatically by an integrated
thermistor (temp changes <5°c p/hr)
pH Range: pH 2 up to pH 11
Permissible Overpressure: 0.5 bar
First-polarisation Time: 120mins
Re-polarisation Time: 30mins
Zero-point Adjustment: Not Necessary
Calibration: Manual using a suitable ozone test kit
Every 1 week to 3 months, application
dependent
Housing Material: PVC, silicone, polycarbonate,
stainless steel
Maintenance intervals: Membrane: Yearly
Electrolyte: Every 3 to 6 months
Interference: Cl2 negligible, ClO2 6%
The membraned amperometric ozone sensors are two
electrode sensors which operates at an elevated applied
potential which in turn eliminates zero drift. Its unique
design means that no reagents or buffers are required at
all.
In addition to the state of the art amperometric chlorine
dioxide sensors the OzoSense range of ozone analyzers
has all the functionality that you need, and more. Simply
choose the CRONOS, CRIUS® or CRATOS controller to
give you the highest quality ozone monitor, with all the
functionality you need, at the lowest price possible. This
means that you pay for everything that you need and
nothing you don't, without sacrificing the quality of
measurement.
Autoflush
As described in a seperate brochure, the OzoSense can
come equipped to automatically clean itself at user defined
intervals with all the benefits of no operator intervention for
6 months. The Autoflush is particularly useful in food
preparation, pulp and paper, and many applications where
there is likely to be a build up of solids in the sample.
Water Treatment
• Ozone Dosing Control
• Remote Sites
• Cooling Towers
• Hospitals
• Secondary Ozonation
Anywhere you have a requirement to measure residual
ozone is a suitable application for the OzoSense. The
OzoSense ozone monitor range is particularly suited to
working in sites where reliability and ease of use are most
important. The sensor is resistant to the presence of
tensides making it suitable for use in many washing
applications.
Multi-Sensor Systems
The whole range of OzoSense Ozone Monitors and
Controllers can be fitted with additional sensors such as
more ozone sensors, chlorine, pH and many others. Please
ask your local distributor for more details.

CRIUS®
HaloSense
• Low Cost
– texting alarms
– datalogging
– PID control
DioSense - Chlorine Dioxide Analyzer
The DioSense range of Chlorine Dioxide Analyzers, and Chlorine Dioxide Monitors utilise the very latest and best chlorine
dioxide sensor available in the world today. It is a membraned device which is insensitive to chlorine, uses no reagents, is
extremely stable, and has reduced maintenance and reduced whole life costs.
● Amperometric sensors - continuous online ClO2 analyzer
● No chemical reagents - lower cost of ownership
● Suitable for all potable and process waters
● No interference from residual chlorine
● Tolerant of water containing detergents
The DioSense sensors and flow cells are available with different controllers giving you the same great performance with
different communication, display, and control options. With the DioSense range of residual chlorine dioxide analyzers, you get
CRONOS®,
CRIUS®
and CRATOS
CRONOS®
DioSense
• Up to 3 sensors
mechanical)
– modbus TCP
– profibus
– HART
– PID control
CRATOS DioSense
• Medium Cost
• Datalogging
plus:
CRIUS®
DioSense
• Low Cost
• Datalogging
• Up to 6 sensors
– texting alarms
"These are the best chlorine dioxide sensors
we've ever used and we've tested most"
Alistair Cameron, UK

The membraned amperometric chlorine dioxide sensor is a
two electrode sensor which operates at an elevated applied
potential which in turn eliminates zero drift. Its unique
design means that no reagents or buffers are required at all
and calibration is a simple one point (no zero required)
operation.
In addition to the state of the art amperometric chlorine
dioxide sensor the DioSense range of controllers has all
the functionality that you need. Choose from the CRONOS,
CRIUS® or CRATOS controller to give you the highest
quality chlorine dioxide monitor, with all the functionality
you need, at the lowest price possible. This means that you
pay for everything that you need, and nothing you don't,
without sacrificing the quality of measurement.
Autoflush
As described in a seperate brochure, the DioSense can
come equipped to automatically clean itself at user defined
intervals. The Autoflush is particularly useful in food
preparation, pulp and paper, and many applications where
there is likely to be a build up of solids in the sample. The
DioSense range of chlorine dioxide monitors are
particularly resistant to tensides and are therefore
particularly useful in food washing applications.
Water Treatment
• Chlorine Dioxide Dosing Control
• Remote Sites
• Cooling Towers
• Hospitals
• Secondary Chlorination
Anywhere you have a requirement to measure residual ClO2
is a suitable application for the DioSense. The DioSense
chlorine dioxide monitor range is particularly suited to
working in sites where reliability and ease of use are most
important.
The whole range of DioSense Residual Chlorine Dioxide
Monitors and Controllers can be fitted with additional sensors
such as chlorite or pH. Please ask your local distributor for
more details.
Cost of Ownership
With its reduced maintenance, reduced calibration and
reduced spares requirements the DioSense ClO2 analyzers
are undeniably the most cost effective ClO2 analyzers
available.
Specification
Chlorine Dioxide Sensor Probe
Application: All kinds of water treatment (e.g. bottle washing machine, CIP-plants)
Type: Membrane covered, amperometric 2-electrode system
Measurand: Chlorine Dioxide
Sensor ranges: 0 - 0.15 mg/l ; 0-2 mg/l; 0-5 mg/l; 0-10 mg/l; 0-20 mg/l
Resolution: 0 - 01 mg/l
Repeatability: < 1%
Working Temperature: >0 up to 50°c
Temperature Compensation: Automatically, by an integral temperature sensor (temp changes <5°c)
Max. allowed Working Pressure: 1,0 bar, no pressure impulses and/or vibrations
Flow Rate: Approx. 0.5 l/min (min 0.2 l/min)
pH Range: pH1 to pH11
Run-in Time: First start-up approx. 1h
Response Time: T90: approx. 1.5mins.
Zero Point Adjustment: Not necessary
Calibration: Manual using a suitable ClO2 test kit
Every 1 week to 3 months, application dependent
Interferences: Cl2: does not interfere
O3: is measured with a sensitivity 25 times higher than ClO2
1% sulfuric acid or 1% nitric acid in the water have no
influence to the measuring behaviour
Dimensions: Diameter: approx. 25mm; Length: approx. 175mm (4-pole screw connector)
approx. 220mmm (4-20mA, 2-pole terminal)
Storage: Frost-protected, dry and without electrolyte no limit
Used membrane caps can not be stored!
Maintenance: Monitor measuring signal regularly.
Change of membrane cap: Yearly (depending on the water quality)
Electrolyte: Every 3 - 6 months

CRIUS®
HaloSense
• Low Cost
– texting alarms
– datalogging
– PID control
pHSense - Continuous Online pH Meter
The pHSense range of pH Analysers from Pi utilise the very latest and best pH sensors available in the world today for
measuring the online pH of any aqueous solution. They are patented polymer filled sensors with integral reference which uses
no reagents, are extremely stable, and have reduced maintenance and reduced whole life costs.
● Up to 3 years continuous operation
● 2 years warranty
● Suitable for very low conductivity waters
● Integral temperature compensation
The pHSense sensors and flow cells are available with different controllers giving you the same great performance with
different communication, display, and control options. With the pHSense range of online pH meters, you get everything that
you need - and nothing that you don't.
CRONOS®,
CRIUS®
and CRATOS
CRONOS®
pHSense
• Long Life
• Up to 3 sensors (1 pH)
mechanical)
– modbus TCP
– profibus
– HART
– PID control
CRATOS pHSense
• Medium Cost
• Datalogging
plus:
CRIUS®
pHSense
• Low Cost
• Datalogging
– texting alarms
– PID Control
"The pH sensors from Pi are much more stable
than others we've tried and they seem to last
forever" Tom Haslehurst, UK

Specification
pH Electrodes
Type: Combined reference, and measuring
electrode
Reference Type: Patented electrochemically active solid
polymer junction
pH Range: 0-14
Slope: 95-102%
Pressure range: 0-10Bar
Long Term Stability
(drift): <0.01 pH/Hour
Reproducibility: <0.01 pH
EO: -25mV to +25mV
Electrode Resistance: 100-500 Mega Ohms
Response Time: 95% of step pH2 to pH12 <5s
Temperature Range: 0-90°C
Cable length: 6m (any length optional, max. 10 m)
Shelf Life: 12 Months
ATC: PT100
Estimated life: 12-24 months application dependent
Warranty: 1 year
At the Heart of the CRONOS pHSense are the pH
electrodes. These electrodes are patented and have a
large area electrochemically active solid polymer junction.
This innovative design makes the electrodes more
responsive and with a longer life than ordinary electrodes
(typically 3 years). Although they command a higher price
in the market place these sensors are more than cost
effective with their longer life and considerably lower
maintenance requirements, typically only needing
calibration once per two or three months.
Despite all of the additional functionality that this unit has to
offer, the purchase costs are less than or comparable to, its
competitors.
As described in seperate brochures, the pHSense can
intervention for 6 months. The Autoflush is particularly
useful in food preparation, pulp and paper, and many
applications where there is likely to be a build up of solids
in the sample. The AutoCal is used to give completely
operator free operation for up to 12 months.
Water Treatment
• Remote Sites
• Cooling Towers
• Paper Mills
Anywhere you have a requirement to measure pH is a
suitable application for the pHSense. The pHSense pH
meter range is particularly suited to working in sites where
reliability and ease of use are most important. One area
where the pHSense excels is in the measurement of pH in
very low or ultra clean water.
The whole range of pHSense pH meters can be fitted with
additional sensors such as chlorine or ORP. Please ask
your local distributor for more details.
"Multi-sensor systems can save considerable sums
without compromising measurement integrity"
Dr Craig Stracey, UK

CRIUS®
HaloSense
• Low Cost
– texting alarms
– datalogging
– PID control
ORPSense - Continuous Online ORP Meter
The ORPSense range of ORP Meters from Pi utilise the very latest and best ORP sensors available in the world today for
measuring the online Redox potential of any aqueous solution. They are platinum ball based sensors with integral reference
electrodes which use no reagents, are extremely stable, and have reduced maintenance and reduced whole life costs.
● Up to 3 years continuous operation
● 2 years warranty
● Suitable for very low conductivity waters
● Integral temperature compensation
The ORPSense sensors and flow cells are available with different controllers giving you the same great performance with
different communication, display, and control options. With the ORPSense range of residual chlorine analyzers, you get
CRONOS®,
CRIUS®
and CRATOS
CRONOS®
ORPSense
• Long life
• Up to 3 sensors
mechanical)
– modbus TCP
– profibus
– HART
– PID control
CRATOS ORPSense
• Medium Cost
• Datalogging
plus:
CRIUS®
ORPSense
• Low Cost
• Datalogging
• Up to 6 sensors
– texting alarms
"The ORP sensors from Pi are much more
reliable than others and they have a very
long life" Bhupendra Patel, Africa

Specification
ORP Electrodes
Type: Platinum Ball
Reference Type: Patented, solid state reference
ORP Range: -1999 to 1999mV
Slope: 95-102%
Pressure range: 0-10Bar
Long Term Stability(drift):<0.1 mV/Hour
Reproducibility: <0.1 mV
Electrode Resistance: 150 mega Ohms
Response Time: 95% of step <5s
Cable length: 6m (any length optional - max 10m, -
1500mV to +15mV)
Shelf Life: 12 Months
ATC: None
Estimated life: 12-18 months application dependent
Temperature: 0-90 C
Lenght: 145mm (5,7")
Dyameter: 26.5 mm (")
Water Treatment
• Remote Sites
• Cooling Towers
• Paper Mills
Anywhere you have a requirement to measure ORP is a
suitable application for the ORPSense. The ORPSense ORP
meter range is particularly suited to working in sites where
reliability and ease of use are most important.
The whole range of ORPSense ORP meters can be fitted with
additional sensors such as chlorine or pH. Please ask your
local distributor for more details.
"Multi-sensor systems can save considerable sums without
compromising measurement integrity"
At the Heart of the CRONOS ORPSense are the ORP
electrodes. These electrodes are patented and are filled
with a polymeric gel. This innovative design makes the
electrodes more responsive and with a longer life than
ordinary electrodes (up to 3 years). Although they
command a higher price in the market place these sensors
are more than cost effective with their longer life and
considerably lower maintenance requirements, typically
only needing calibration once per two or three months.
Despite all of the additional functionality that this unit has to
offer, the purchase costs are less than or comparable to, its
competitors!
As described in seperate brochures, the ORPSense can
intervention for 6 months. The Autoflush is particularly
useful in food preparation, pulp and paper, and many
applications where there is likely to be a build up of solids
in the sample. The AutoCal is used to give completely
operator free operation for up to 12 months.

AquaSense - Pool and Spa Controllers
Key Benefits
► Significant Cost Savings
► Better Sensors
► Better Control
► Better Bathing Experience
► Reduced CO2 Emissions
► Reduced Electricity Usage
► Reduced Chemical Usage
find us at www.processinstruments.net

Introduction
The AquaSense range of pool controllers has been designed
to three criteria:-
• Improved Safety - better sensors lead to better
process control which leads to less variation in
chlorine residuals even with highly variable bathing
load.
• Improved Control - better process control leads to
reduced chemical usage, lower costs and an
improved bathing experience.
• Reduced Costs - lower chemical costs, less
expensive controllers, hugely reduced electrical usage
costs are just a few of the ways that the AquaSense
can save you money which can pay for a new
controller in just a few months.
Sensors
Traditionally pool chemistry has been controlled by using
ORP (Redox) or Residual Chlorine Sensors. The quality of
the sensors has a huge effect on the ability of the controller
to maintain a safe and pleasant bathing water. The sensors
used in AquaSense controllers are the best available in the
world today and are exactly the same sensors that are used
to monitor and control drinking water in many municipal
drinking water plants worldwide.
Chlorine Sensors
Three sensors are available to measure; free chlorine, total
chlorine, or chlorine in the presence of cyanuric acid. All of
these sensors have a long life (10 years) with reduced
maintenance and calibration requirements. they are very
high quality and very easy to own. Being able to accurately
measure the chlorine and respond to varying bathing loads
means that pools and spas can operate at lower chlorine
levels, reducing the formation of unpleasant combined
chlorines and reducing the chemical usage, thereby reducing
costs and reducing emissions, all while providing a better
bathing experience.
pH and ORP Sensors
The pH and ORP sensors are made specifically for the
AquaSense controllers and come with either a 12 or 18
month warranty. These AquaSense pH and ORP sensors are
also exactly the same as those used in the water industry
and are not the low cost, low quality sensors that are often
supplied into the Pool Industry.
Remote Access & Text Alarms
More and more pools are maintained by service
professionals that are based off-site and the ability of these
engineers to respond quickly and effectively to a process
upset at a pool depends on them getting the correct
information as soon as possible. The CRIUS® AquaSense
and the CRATOS AquaSense can come equipped with their
own integral GSM, GPRS or CDMA modem. This in turn
allows anyone with the appropriate security level to receive
text alarms relating to the chemistry in the pool or spa and
also allows them to log in to the controller over the internet
and perform almost any action that they could do if they were
standing in front of the instrument.
(For an online demonstration of this please go to
www.processinstruments.net/products/remote-access-
demo.php)
The highly sophisticated pro-active text alarms and remote
access capability of the CRIUS® AquaSense and CRATOS
AquaSense, means that:-
• Improved Communication - the right people know as
soon as something happens.
• Improved Control - your expert is in your pool room
no matter where they are.
• Less Time to Fix Problems - the time taken to fix
any problems is greatly reduced.
• Reduced Costs - time, cost and car exhaust
emissions are reduced.
"Since installing two CRIUS AquaSense
in 2008, our control over the pool chemistry has
greatly improved, leading to a better bathing experience
for our customers"
Ron Sykes, UK
"I have installed many pool controllers over the
years and the quality of the AquaSense sensors is the
best there is"
Lester Simmonds, UK
"Being able to remotely access and
control the AquaSense pool controller allows us to
provide a better service to our customers and a better
bathing experience to theirs' "
Steve Murphy, UK

BMS
Many leisure facilities are now fitted with sophisticated BMS
(Building Management Systems) and all three Pool and Spa
controllers are able to communicate directly to the BMS
whatever system it might be. Each of the Pool and Spa
controllers from Pi can come equipped with a range of
communication protocols including LAN, Profibus, Modbus
and more traditional analogue and digital outputs.
Save Money and the Planet!
Most pool recirculating pumps are over specified for the duty
required and as such there is scope to turn them down and
save considerable amounts of money on the electricity
usage. Whenever you save electricity you are reducing the
CO2 emissions and carbon footprint of your pool and spa and
for many organisation reducing CO2 emissions is a
significant factor in choosing which equipmrnt to purchase. It
might not save the planet but it is a good start! In order to
turn down the pool recirculating pump the pump motor must
be fitted with an invertor. The question then arises - on what
basis do we turn the motor down?
Each pool has a minimum turnover set by the manufacturer
or consultant at the time of installation. The CRIUS® or
CRATOS AquaSense allows the user to turn down the
recirculating pump during periods of non pool use (overnight)
to the minimum level. While the pool is being used the
recirculating pump motor is set based on chlorine demand
which is proportional to bathing load. This ability to control
the recirculating pump based on chlorine demand means
that pool operators can save significant sums of money on
electricity during the day when electricity costs the most.
CRIUS®
AquaSense
• Up to 2 Pools
• Low Cost
• Datalogging
– texting alarms
– invertor control
– integrated flow control or flow
regulation
CRATOS AquaSense
• Up to 4 Pools
• Medium Cost
• Datalogging
• All CRONOS® and CRIUS® options:
CRONOS®
AquaSense
• Single Pool
• Up to 3 sensors typically chlorine
and pH or Redox and pH
– 4-20mA outputs
– relays (solid state or
mechanical)
– modbus TCP/ASCII/RTU
– profibus
– HART
– flow switch
– on/off control
– analogue control
– PID control
"The invertor control on the CRIUS AquaSense is
saving our customers considerable sums of money, often
paying for the controller within a year."
John Moffatt, UK

High quality sensors
Multilingual
Set up wizard
System logger
Datalogger
Event logger
PID controls
Single pool
Up to 2 pools
Up to 4 pools
Analogue outputs V and mA
Isolated universal inputs & outputs
Multi line display
Coloured backlight
Colour screen
Touch screen
Integrated modem and text alarms
Up to 4 relays
Up to 8 relays
Up to 16 relays
Remote internet access GSM/GPRS
Remote Access LAN
Profibus
Modbus ASCII/RTU serial
Modbus TCP (LAN enabled)
HART
AC & DC versions
Invertor Control
CRONOS®
●
●
●
●
Opt
●
●
Opt
●
●
●
Opt
Opt
Opt
Opt
●
CRIUS®
●
●
●
●
●
●
Opt
●
●
●
●
N/A
●
Opt
Opt
●
Opt
Opt
Opt
Opt
Opt
Opt
●
Opt
CRATOS
●
●
●
●
●
●
Opt
●
●
●
●
N/A
●
●
Opt
●
Opt
Opt
Opt
Opt
Opt
Opt
●
Opt
Texting via GSM
Modem
Remote Access via GPRS/CDMA Modem

PolySense - Polymer Control for Sludge Dewatering
The PolySense utilizes an online measurement of the cake dry solids and an online measurement of the solids in the
centrate/filtrate to control the polymer addition and the sludge feed rate, in order to optimise the process.
This gives you:
• Typically 25% reduction in polymer usage
• Increased cake solids
• Reduced transportation costs
• Less foaming
• Reduced solids in the centrate/filtrate
• Reduced operator reliance
• Capital payback, often in less than 18 months
"PolySense has revolutionised the
dewatering of our sludge, we get drier
cake, less cost and less process
upsets", David Bennett, UK
Why the Need for Automatic Polymer Control?
The Problem
The consequences of overdosing polymer to a dewatering device such as a centrifuge are much less than the
consequences of underdosing and with time pressures on operators, this inevitably leads to overdosing on most
centrifuges and belt filters. This overdosing gives the operator a time ‘buffer’ against process variations.
Overdosing of the polymer can lead to:-
• increased polymer costs
• increased solids in the centrate
• increased foaming in the centrate
• decreased solids in the cake
• increased transport costs per tonne of waste
• increased load on the works
• reduced efficiency of driers and digesters
The Solution
The PolySense is a simple, but effective and reliable method of controlling the polymer dosing via the polymer dosing
pump and in some cases the feed rate to the centrifuge. It does this by making reliable online measurements of the dry
solids of the cake, and of the suspended solids in the centrate/filtrate, and in some cases the feed solids. These
measurements are the key to the success of the PolySense and the suspended solids instrument includes debubbling
technology and self-cleaning where required. Essentially the PolySense measures the suspended solids in the centrate
(or sludge feed) and the dry solids in the cake and adjusts the polymer dosing pump, (and in some cases the feed
pump), to maintain those ranges of cake solids and centrate suspended solids that produce the best outcomes for the
plant. Whilst the PolySense does not monitor or control all aspects of the sludge dewatering equipment such as the
speed of the centrifuge, it provides a reliable and much improved process control to the more traditional manual control.

Case History
In late 2008 a compliance engineer for one of the UK
Waste Water Utilities contacted Pi in order to start the
process of determining the best instrumentation to control
his Alfa Laval dewatering centrifuge. He had determined
that by manually controlling the centrifuge and constantly
making small adjustments to the poly dose he could
significantly reduce his poly usage whilst maintaining the
cake solids. Having determined this manually he
approached Pi seeking to automate the process. This was
a perfect application for the PolySense.
In consultation with the engineer, it was determined that
he could achieve his goals using a two point
measurement system (online cake solids and online
suspended solids in the centrate), with the appropriate
control algorithm feeding back to the DCS that would in
turn control the polymer feed pump. His total cost
including installation and commissioning was £26,000 and
his average reduction in poly usage was 25% giving a
payback inside 18 months.
“Although the financial justification for the project was
based on polymer savings alone the additional benefits
were significant. The reduction in Carbon Footprint is as
yet unquantified but significant, and the improved
consistency of cake solids has resulted in higher average
cake solids and a reduction in transportation costs. The
operators have all bought in to the system and are happy
that they are freed up to carry out their other duties secure
in the knowledge that if anything should go wrong they will
be informed via the alarms generated from the control
signals. The company are now beginning the process of
rolling the system out across other sites.”
Multiple Control Options
During normal operation the PolySense will control the polymer to keep the Dry Solids in the cake and the Suspended
Solids in the centrate to within user selectable ranges. These ranges are set up on commissioning and are likely to give
a good compromise on polymer usage, cake solids and loading on the works. There are occasions, however, when
reduced polymer isn’t the most important outcome. It may be that there is pressure on the works and reduced loading
going back to the head of the works is more important, or perhaps the cake is being transported off-site so the driest
possible cake solids is the most important outcome.
Each PolySense is equipped with five sets of control settings that can be set up on commissioning to allow the operator
to easily select the appropriate control setup for the plant requirements at the time. e.g.
• Normal operation
• Driest cake
• Cleanest centrate
• Most consistent cake solids
• Least polymer usage
GPRS Remote Access is
included as standard with
CRIUS® PolySense

CRIUS®
HaloSense
• Low Cost
– texting alarms
– datalogging
– PID control
BioSense - Biofilm Monitor
The BioSense range of qualitative biofouling monitors provide a relative measure of how much biofilm is building up in your
process, allowing you to dose your biocide accordingly or take other appropriate remedial action.
● Legionella control
● Automatic Biocide control
● Can be combined with other sensors
● No maintenance
● Monitor the development of Biofilm
● Shows cleanliness
● Reduced chemical costs
The BioSense sensors are available with different controllers to give you the same great performance with different
communication, display, and control options. With the BioSense range of biofilm analyzers, you get everything that you need -
and nothing that you don't.
CRONOS®
, CRIUS®
and CRATOS
CRONOS®
BioSense
• Up to 3 sensors
mechanical)
– modbus TCP
– profibus
– HART
– PID control
CRATOS BioSense
• Medium Cost
• Datalogging
plus:
CRIUS®
BioSense
• Low Cost
• Datalogging
• Up to 6 sensors
– texting alarms
"Using the BioSense allows
us to monitor for biofilm
development and then to
dose the appropriate biocide"

Legionella Risk Management
Cooling systems and heating systems in e.g. hospitals, airports, government buildings, hotels and very large office blocks
can be a source of the Legionella bacterium. The bacteria often grow in biofilms that adhere to the walls of a pipe or other
vessel. The BioSense allows you to monitor for the development of this buildup and dose the appropriate chemical to
reduce and disperse the biofilm prior to building up a dangerous level of Legionella.
Automatic Biocide Control
Measuring the residual biocide in a body of water only tells half the story. It tells you that there is little or no biological
activity in the bulk water. This doesn't necessarily mean that biofilm isn't building up on the walls of pipes and vessels with
the possibility of the development of harmful bacterial colonies. The BioSense allows you to monitor the build up of that
biofilm and in turn take the appropriate action AUTOMATICALLY to return the system to a clean condtion. This could be as
simple as triggering an alarm for a manual intervention or as complex as increasing biocide levels or shock dosing, all
controlled by the BioSense. The BioSense gives you:
• Control of system surface biological activity
• Treatment effectiveness monitoring
• Biocide program optimisation
• Indication of a "clean" state
Biofilm - The solution
The BioSense sensor was developed to provide on-line and real-time indication of biofilm activity on typical metallic
surfaces. The probe is designed and operated so that microorganisms in the environment will settle on probe surfaces
before they settle on vessel walls or piping. This gives an early warning of potentially dangerous biological activity in the
process. By closely tracking biofilm activity on the probe, the BioSense can take remedial action such as increasing the
dosing of a biocide or dispersant. The BioSense biofilm controller can also be used to assess the effectiveness of a
treatment, or to schedule maintenance activities. By monitoring biofilm activity on surfaces very precisely, costly over-
treatment can be avoided and chemical treatments can be optimised, therefore BioSense can:
• Reduce the risk of Legionella growth
• Reduce the cost of chemical treatment
• Reduce maintenance
• Increase the efficiency of process equipment
The controller applies a potential between the
probe electrodes that causes microorganisms
to settle on the surface of the probe before
they would settle on the surfaces of a pipe or
a vessel. The biological activity of the biofilm
creates a signal.
A BioSense controller collects and monitors
that signal continually. An increasing trend in
the signal indicates the onset of biofilm activity
on the probe. The controller can then take
remedial action automatically by, for example,
increasing or decreasing the biocide levels.
The CRONOS BioSense is a simple controller
capable of automatically changing, dosing
regimes etc. With the more sophisticated
CRIUS® and CRATOS controllers providing,
data logging, remote access and control via
GSM.

CRIUS®
HaloSense
• Low Cost
– texting alarms
– datalogging
– PID control
ConductiSense - Online Conductivity Meter
The ConductiSense range of Conductivity meters from Pi utilise the very latest and best conductivity sensors available in the
world today for measuring the conductivity from 0 to 2,000,000 uS/cm (range selectable) . You can chose between a standard
graphite sensor and a more sophisticated toroidal sensor, or stainless steel boiler specific sensors.
● Low purchase cost
● Low cost of ownership
● Resists coating, corrosion and fouling
● Durable Noryl construction
● Easy installation
● Custom tee for in-line mounting
The ConductiSense sensors and accessories are available with different controllers giving you the same great performance
with different communication, display, and control options. With the ConductiSense range of Conductivity Monitors, you get
CRONOS®
, CRIUS®
and CRATOS
CRONOS®
ConductiSense
• Mix and match sensors
• Up to 3 sensors
– up to 4 alarm relays (solid state
or mechanical)
– Modbus TCP/ASCII/RTU
– Profibus DP
– HART
– PID control
CRATOS ConductiSense
• Medium Cost
• Datalogging
plus:
CRIUS®
ConductiSense
• Low Cost
• Up to 6 sensors
• Datalogging
– texting alarms

Specification
Advanced Toroidal Sensor
Type: Toroidal
Measuring Range: Min 0-20uS; max 0-2,000,000uS
selectable
Body Material: Noryl
Max Temperature: 105 Degrees C
Max Pressure: 10 Bar
Temp Comp: Optional
Cable Length : 6 meters, 6 conductor plus shields
Process Connection : 3/4" MNPT for submersion, 2"
standard tee with adapter
Graphite
Our light industrial conductivity sensor utilises Graphite
technology. The durable epoxy body construction provides a
rugged and dependable sensor for potable water and clean
water. Mount them in-line, in a pipe "T" fitting, or submerse
them into a tank. For many applications, the epoxy body
conductivity sensors are the lowest cost, most reliable
conductivity sensor to use, especially for process
applications. Rugged epoxy bodies make the sensors
virtually unbreakable. These are an excellent choice to use
as standard online conductivity electrodes in the water and
related industries.
Specification
Standard Epoxy Sensor
Type: Graphite
Measuring range: All ranges from 0 – 199.9 mS/cm
Cell Constants: k=0.1
Measuring Surface: Graphite
Body Material: Epoxy
Max Temperature: 70 Degrees C
Max Pressure: 7.5 Bar
Temp Comp: Optional
Cable: 22 AWG 2-wire or 4-wire, for
temperature compensated
type. 6 m standard unless
otherwise specified
Toroidal
The toroidal inductive conductivity sensors features a wide
measurement range and dependable toroidal technology
over the range 0-2,000,000uS/cm . Resistant to corrosion,
coatings and fouling common to contacting conductivity
sensors, this probe is designed for a trouble free and long
service life. Noryl is the standard material of construction
and has a wide solvent tolerance and temperature stability
to 105 degrees C. All models can be submersed by utilizing
the 3/4” MNPT threads on the sensor or installed in 2” NPT
tees for in-line deployment. A temperature sensor is built
into the conductivity sensor for automatic temperature
compensation.

CRIUS®
HaloSense
• Low Cost
– texting alarms
– datalogging
– PID control
Autocalibrator - for free and total chlorine
The HaloSense Residual Chlorine Analyzer is the first of its kind in the world to offer automatic calibration as an option.
Cleverly engineered and using state of the art electronics the HaloSense Autocalibrator for free and total residual chlorine is
able to save customers considerable sums of money by autocalibrating at user-defined timed intervals, without the presence
of an operator.
• No maintenance for up to 6 months
• No calibration for up to 6 months
• Low cost of ownership
• Optional email/SMS text alarms
• Optional remote control via GSM/GPRS modem
"The HaloSense Autocalibrator is reliable, dependable and
saves a fortune on travelling to remote sites. I am very happy
with the ones I've installed." Wayne Burton, UK
The HaloSense membraned potentiostatic chrono
amperometric chlorine sensor, is housed within the
Autocalibrator. Its unique design means that pH effects are
small and pH correction or compensation is not usually
required.
The Autocalibrator enables the HaloSense Chlorine
Analyzer to be operated completely unattended for up to 6
months. At user defined intervals the Autocalibrator takes a
sample, removes the chlorine from it by passing it through
an activated carbon filter, and then adds the appropriate
amount of a chlorine solution to a fixed volume of chlorine
free water. This solution of a known chlorine concentration is
then passed over the sensor which is allowed to equilibrate
and then the sensor is calibrated by the electronics.
In addition to the state of the art sensors the HaloSense
range of controllers offers an impressive range of
communication protocols including Modbus, Profibus,
TCP/IP (with webserver), RS485, Relays and 4-20mA
outputs. Added to the cost savings of a truly automatic (no
operator present), calibration system, some will achieve a
replacement payback of only a few months.
Autocalibration
Whenever a chlorine analyser is calibrated by an operator
or technician there is a cost involved and risk of human
error. With the HaloSense Autocalibrator the costs of getting
to and from a remote site, or the risk of an operator
calibrating an analyser incorrectly are eliminated.
• Calibration at unsocial hours
• When reproducibility is paramount
• Remote sites
• Skilled personnel not required
Water Treatment
• Remote sites
• Automatic calibration
• Chlorine dosing control
• Secondary chlorination

What Safeguards are Built-in?
In the event of a problem with the calibration, the system will
attempt a second calibration. If that too fails then a system
fail alarm is given out and the analyser will not accept the
new calibration. A system fail alarm will result from any of
the following;
• A change in calibration of more than 10% from
the previous calibration.
• An unstable signal from the probe (the rate of
change of the signal is monitored thus ensuring
that any fault in the calibration process does not
produce large errors in the Chlorine Residual
reading).
• A sensor that doesn’t get within 5% of zero
indicates a failed filter or a failing sensor.
• A low sample flow or low sample pressure will
trigger an alarm.
An optional, integral GSM/GPRS modem allows the
operator to be advised of an alarm immediately, and the in-
built PID control provides flexible chlorine dosing control
options.
Specification
Chlorine Sensor
Type: Membrane covered potentiostatic chrono amperometric three-electrode system
Measurand: Total Chlorine or Free Chlorine
Range: 0.01-1, 0.01-2, 0.01-5, 0.01-10mg/l
Resolution: 0.01mg/l (ppm)
Reproducibility: ±5 %
Stability: -2 % per month (without calibration)
Working electrode: Gold
Counter electrode: Stainless Steel
Reference electrode: Silver / silver halide
Membrane material: Micro-porous hydrophillic membrane
Flow rate: Approximately 0.5l/min (min 0.2l/min)
Temperature range: >0 up to 40°c
Temperature compensation: Automatically by an integrated thermistor
pH-range: pH 4 up to pH 9,5
First-polarisation time: 120 min
Re-polarisation time: 30 min
Zero-point adjustment: Not necessary
Calibration: Manual using DPD or Automatic
Housing material: PVC, silicone, polycarbonate stainless steel
Maintenance intervals:
Membrane: 12-18 months
Electrolyte: 3-6 months
Calibration reagent: 6 months
Interferences: High levels of other oxidants such as Ozone and Chlorine Dioxide
The CRIUS® HaloSense Controller offers:
• Remote access via GPRS
• Text alarms
• PID control
• Automatic cleaning
• Up to 6 sensors and outputs
• Integrated flow control
• Autocalibration
• Profibus
• Modbus

Autoflush - keeping sensors cleaner for longer
Key Benefits
• Frequent flushing prevents build-up of
solids
• Reduced maintenance
• Prolonged sensor life
• Suitable for pH/ORP/Cl2/O3/ClO2
• User selectable flush duration
• User selectable flush frequency
• ‘Flush now’ facility
• Simple, infrequent maintenance
The idea is simple and effective….every x minutes, (the
user can adjust x) the sample drains away and the sensor
and sensor housing is flushed with clean water. This water
flushes the whole of the inside of the sensor housing taking
away any build-up of solids to drain. The repeated flushing
of the housing and sensor helps prevent the build-up of
solids and so prolongs the life of the sensor and reduces
the maintenance. For waxy or fatty build-ups warm water
can be used to flush the sensors. As standard heavy duty
pinch valves ensure reduced maintenance over a long life.
Applications
• pH on paper mills
• ORP in scrubbers
• Chlorine in food disinfection
• pH in slurries
• Ozone in food washing
• Pre-chlorination
• Chlorine in paper mill stock
• Chlorine in waste water
"The Autoflush from Pi has
meant that we can now
measure chlorine applications in
dirty water applications reliably
which previously we couldn't",
Eddy Scott, UK

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