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Loop Checking and Field Instrument
Testing Procedure
Category: Implementation Loop Analysis Loop Performance Usability
Submitted by Katherine Bonfante on Thu, 10/04/2012 - 10:00
Everybody knows that loop checking and field instrument testing is the last piece of the
puzzle in each project before commencing the commissioning of any system. It is time-
consuming and depends upon the completion of other systems like piping, electrical
equipment, control valves etc.
Each contractor or company has its own procedure and common practices for instrument
loop checking and functional testing. I found this forum is good place to discuss this topic in
more detail, for example:
1. Can we have a common or guide line procedure for loop checking?
2. Can we illustrate all the required drawings, specification and forms required for loop
checking?
3. Can we build a flow chart for loop checking which illustrates the rule of operation,
maintenance, engineering and inspection for example?
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Comments
• Submitted by santhiraj sathanna on Fri, 09/06/2013 - 08:58
This is a very good topic for discussion.
We do the following in our organisation

2. 1.A detailed loop check format is prepared for each project 2.Above is based on latest I/O
list , P&ID and process narrative. 3.For each I/O point, all connected details/elements like
PLC/DCS I/O module,Panel Terminal Block, Marshalling panel Terminal Block,
Junction Box Terminal Block,Instrument/Final Control element tag, Service
description,calibration range,cable tag.... 4.We do this testing by involving owner's as
well as prime EPC bidder's Engineer as witnesses. After successful completion, the
document gets signed by them.
We follow the same procedure for commissioning the logic as well as to demonstrate the
same to end user!
This is time consuming and we do it religiously to eliminate last minute surprises.
Reply
• Submitted by on Tue, 10/29/2013 - 12:24
I fully agree with all 3 points. A guide is really needed. I takes much time to get agreed
such procedure in every new project and a unified approach would be very effective here.
To the second point I may add that a list of such documents would be very useful as well
to avoid creating of a huge dossier and got all needed papers in place. Templates for
certificates would be fine. As to the third point I'd a recommended list of personal of
performing and witnessing parties. Mikhail Aravin, Senoir Instrument Commissioning
Engineer.
Reply
• Submitted by Edward Smigo on Fri, 12/27/2013 - 10:45
The loop testing procedure can vary depending on the instrumentation and I/O
infrastructure. A foundation fieldbus or Profibus PA based system would be different
from a system using conventional or HART instrumentation on a system with HART I/O
cards.
While one can perform a loop test with a handheld communicator when HART I/O is not
present on the automation system that process would require multiple people similar to
performing loop tests with conventional instruments. One benefit HART instrumentation
has over conventional is the non intrusive nature of the testing. One does not need to
break the loop to insert a mA simulator. HART instruments have a Loop Test method that
allows the tester to drive the mA output of the instrument from a hand held
communicator or an Asset Management Software application, When using Asset
Management software, testing can be done more efficiently because a single person can
be commanding devices from one window and observing results on another. An
additional benefit when using Asset Management software is that multiple instruments
can be put into loop test simutaneously which allows one to incorporate interlock logic
checks along with the loop tests which further streamlines the comissioning process.

3. Since loop tests are often the final step before start-up, and projects schedules often slip,
there is always pressure on the loop testing team to gain efficiencies to pull in the plant
startup milestone.
Reply
• Submitted by Tom Dotts on Tue, 12/30/2014 - 08:30
Unfortunately, even today's large manufacturers have lost qualified process control
specialists and engineers, leaving sometimes, unqualified personnel to decide how a
"system" should be validated. A systematic approach is necessary and a legitimate step
towards ensuring the "completeness" of even the smallest of project, upgrade or change
to or within a BPCS or SIS on the plant floor. Of course regulations apply to safeties, but
many times the even the fundamentals of instrumentation go unchecked and now become
a liability. Standardization is needed - especially within chemical and petro-chemical
applications. T.Dotts, Contract EI&C Technician / Project manager.
Reply
• Submitted by Charles Palmer on Wed, 01/14/2015 - 03:23
I would like to share some perspectives : Loop testing and plant commissioning done in-
house is one aspect. Naturally the requirement for policies and procedures is mandatory
( as in both cases) Things change slightly when this work is been done under contract by
a 3rd party. Once again the policies and procedures are required. FAT and SAT
procedures should be issued to the supplier/contractor within 30 days of contract
signature. As a Consultant, I have witnessed so many poor FAT and SAT company
procedures in many different countries ( Cultures if you like). This has compounded poor
FAT testing into total SAT failures as the fault could not be isolated to Panel or Field .
Many hours could have been saved if the bookwork had been done up front.
Reply
• Submitted by Sankar Kumar R on Tue, 02/24/2015 - 03:43
I would like to summarize the requirement prior to start the loop check activity as
follows:
1. SAT of DCS/ESD/F&G and IAMS system shall be completed and ready with all pre-
requisites completed. 2. Total IO's shall be divided into loops & Loop Folder shall be
prepared and approved from PMC/Client. 3. Loop folder shall contain the following
documents as a minimum : a) Loop test record format (To enter the details of the
Instrument subjected to loop check and the master instrument used). b) Instrument Data
sheet(s) related with the loop. c) P&ID sheet related to the Instrument(s) d) Instrument(s)
loop drawing (derived from Intools which shall contain termination details from Field
through JB's to Rack Room) e) C&E sheet (For logic checks) f) IO Point Database (To
refer : Ranges, Alarm Points, Controller action etc) g) Calibration sheet of Instruments in

4. loop. h) Observation sheet (To note down any observations during loop check/logic
check activity for necessary corrective action). 4. Prerequisites like HVAC, Utilities shall
be ensured 5. Loop check shall be carried with Handheld communicator / Calibrators or
from IAMS system (For both FF & HART devices). 6. The checks shall be witnessed &
loop folder documents shall be signed by DCS contractor, EPC contractor, PMC &
Client.
The preparation of above said document is time consuming but these will ease the loop /
logic checks as all data's will be available in a single folder.
This is the procedure we are following in our Greenfield Petrochemical Project.
Instrument Calibration, Loop Testing and System Start Up
Instrument Calibration is a necessary and important part of any instrument system. The accuracy of the
information produced by any instrument is dependent on it.
Instrument Sciences and Technologies Inc. recognizes the importance of calibration and has tailored the
company policies and procedures to ensure you receive the highest level of quality and accuracy your
process requires. After all, your end-product quality and customers count on it.
• We have a full, experienced staff of highly qualified Instrument Technicians ready to serve you. All
technicians performing calibrations and loop check are EPRI level II and/or ISA level III qualified.
• We own over 400 individual pieces of NIST (National Institute of Standards and Technology)
traceable calibration and test equipment. This inventory is meticulously logged, tracked, and evaluated
per our Quality Manual's documented procedures. All equipment is either annually or semi-annually
recalibrated and certified by an independent testing laboratory to NIST standards. Any instrument
calibrated with this equipment is NIST traceable.
Some of our calibration services include:
• Custom tailored customer/site specific recurring calibration program. Inventory is taken of
your instruments to determine the condition and frequency of calibration required. A Technician arrives
at your site when required to perform these calibrations, leaving you with a Calibration Certificate and up
to date Calibration sticker affixed to the instrument. If the instrument needs repair, replacement, or
relocation, this service can be performed during this process.
• Project specific calibration. We are an unlimited resource of Certified Instrument Technicians for
your project. Our technicians are experienced in all the industries we serve, whether it is a Class 100
clean room, the top of a smokestack, or a confined space.
• Field and Bench Calibrations. One way to save time and cost during construction of your project
is to have your instruments calibrated prior to installation. We call this "Bench Calibration". Our
calibration facility is set up on site and staffed with technicians. We take care and custody of your
instruments. We then calibrate, certify and document every instrument. Generally, calibration can be
done quicker prior to it's installation. Instruments pre-installed will be field calibrated.
• In-house calibrations. Send us your instrument. We will calibrate it, certify it, and return it to you
with your new calibration certificate and sticker.
• Calibration for Validation.

5. • Experienced and professional Start-Up and Turnaround teams.
• Instrument Loop Testing.
• Writing of Standard Operating Procedures for Calibration.
INSTRUMENT SCIENCES AND TECHNOLOGIES, INC. • 1131 State Highway Route 12, Frenchtown NJ 08825
P: 908 996 9920 • F: 908 996 9925 Email: info@istinj.com • Privacy • Site MapSite created by ThomasNet Web Solutions
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Question WHAT IS LOOP CHECKING ?
Question Submitted By :: Instrumentation
I also faced this Question!! Answer
Posted By
Answers were Sorted based on User's Feedback
Answer
# 1
Dear Instrumentation Friends,
The Loop checking is defined as
pre-Commissioning activity
which is initiated after installation of
instruments at x
location to y location instruments or
systems.
abdul
hameed

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Loop checking is basically done to
ensure the instruments
installed at x and y location has
continuity signal with
each other potential's.
If we want to loop check the
continuity from instrument to
junction box this is acheieved by
laying a cable between
instrument and jounction box.
Normally after installation and
cable laying during
construction activity is to be
ensured that instrument and
cable and junction termianls and
cable which is layed
underground or above ground & is
not damaged to confirm this
damage it is mandatory to carry out
loop checking between
instruments-junction box- Dcs that
is from field to control
room.
Simple Process:- is short the two
cores of cable at one end
and check with digital multimeter at
other end if the
circuit resistance is ok then the
same cores have the cont
unity which means that the cable
cores are'nt damaged.
above procedure also helps to
identify the particular cable
cores for specific system founction
Above process is called as Cold
Loop Checking loop checking

7. without any external sorce
simulation.hencecalled as cold
loop check.
Is This
Answer
Correct
?
46 Yes 4 No
Answer
# 2
Usually used term in Distributed
Control System design-
after the logic for the process has
been programmed into
the DCS software,the controller
cabinet alongwith the IO
modules is interfaced to the server
on which the logic
resides.The IOs are assigned as
required and circuit
continuity check is carried out-
LOOP CHECKING..Outputs are
forced to some value(universal) or
forced high(binary) and
the signal level is checked at the
output Terminal block of
the IO module.Similarly for Input
checks, Voltage/Current
is fed via a calibrator at the Input
Terminal Block (1 by
1) and signal is detected via the
monitoring mode on the
DCS software..This is to ensure
circuit continuity and
scaling(signal limits)-it requires
time and usually done as
pre-FAT or FAT procedure.
Is This
Answer
33 Yes 8 No
nachiket
dani

8. Correct
?
Answer
# 3
Loop check activity is checking
entire loop functionality, from field
to DCS or Esd or plc or any logical
system. It is necesary to check not
only continuity of signal, but also
range of calibration, alarms, set
points and any signal included in
the loop folder. For DCS will be
tested with hart comunicator or
temperature generator, 4-20mA,
depends of witch instrument is
involved. For Esd (emergency shut
down system) loop check will be
done with proper instrumentation
tools to produce the specific
presure or requaired level... For
valves you must check all signals
as open, close, hi and low limit
switch, reset buttons, hand
switches , feedback must be check
and a lot of other things must be
checked .. Loops are direct, revers,
split range .. it is not easy and it is
not only the continuity check to do.
Is This
Answer
Correct
?
20 Yes 2 No
scheau
vlad
Answer
# 4
Loop Check
Definition:
bill munz

9. Loop Check: An operational check
of the field, controller
and HMI elements of a control
loop. A Loop Check is
intended to ensure the integrity of
the following.
• The field sensing device is
properly installed in
accordance with engineering
specifications.
• The field sensing device is
calibrated in
accordance with engineering
specifications.
• The field sensing device is
properly connected to
it’s communication path to the
Distributive Control System
Controller. (e.g. Current Loop,
Multiple device Bus
Communication Protocol, etc.)
• The field sensing device develops
and transmits a
proper analogous signal in
response to a variable impressed
upon it or a simulation command
issued to it.
• The corresponding logic in the
DCS Controller is
ranged accordingly for the field
sensing device analog and
engineering units.
• The HMI of the DCS Controller
accurately displays
the engineering unit response to
the signal of the field
sensing device.
• Alarm points are properly entered
into the logic
of the DCS Controller and the HMI
displays and logs these
appropriately as they are reached.

10. • Where control functionality is
required, that the
signal from the field sensing device
is received by the
control algorithm and generates
the appropriate corrective
output signal.
• If present, the field control device,
(e.g.
Control Valve, Variable Speed
Control etc.), is properly
installed in accordance with
engineering specifications.
• The field control device is
calibrated in
accordance with engineering
specifications.
• The field sensing device is
properly connected to
it’s communication path to the
Distributive Control System
Controller. (e.g. Current Loop,
Multiple device Bus
Communication Protocol, etc.
• The Field control device responds
appropriately to
the corrective signal received from
the DCS Controller and
that this action is appropriate to the
desire process
variable.
• Where specified, the response
action of the valve
is correctly transmitted to the DCS
Controller and
displayed on the HMI.
• SUMMARY The Loop Check is
intended to locate and
identify deficiencies in the
Field/Controller/HMI
interface. This includes, but is not
limited to, wiring

11. and cabling issues, engineering
issues and mechanical
installation issues. It is not the
focus of the Loop Check
to correct any deficiencies found.
Full information
concerning the deficiency is
captured and passed on to the
appropriate parties for correction.
Minor corrections can
be accepted, but this should be
limited in scope.
Procedure:
• A list of Loops is collected and
identified by Tag
Number.
• Loops are grouped by Location,
Availability,
System, Equipment or other
criteria. (Note: Locational
Grouping of Loops results in the
most efficient execution
of Loop Check. The field team can
be routed in a logical
geographical progression of one
device to another adjacent
device without time loss for
accessing different floors,
buildings, plant sections etc. Loop
availability can
prevent this. If at all possible, Loop
availability should
be planned to accommodate
Locational Grouping)
• Each loop is assigned a separate
unique folder.
o Each Loop Folder is populated
with either a
comprehensive Loop Sheet, and/or
individual elements,

12. consisting of the following
 Field Device Tag
Number
 Field Device Parameters
• Calibrated Zero Process Value
and corresponding
Analog (common 4 ma)
• Calibrated Full Process Value
and corresponding
Analog (common 20ma)
• Action
 Field Device Accessory
List (e.g. Transmitter 3
Valve manifold, Valve Pneumatic
Latch etc.)
 Field Device Physical
Location
 Field Device instructions
as appropriate
 Field Device Wiring
connection data. (Terminals,
polarity)
 Wiring Routing
information (e.g. Junction Boxes,
Terminals etc)
 DCS I/O Marshalling
Information,
(Cabinet,Terminals, Polarity)
 DCS I/O Card or Module
information.
 DCS Parameters
• Ranges
• Alarm points
 DCS HMI Graphics
assignments
• From the Pending Loops file, the
Console Engineer
and the Field Technician draw the
Loop Folders to be
checked in that time period.
• The Console Engineer and the
Field Technician

13. review the contents of each Loop
Folder in the group to be
checked, comparing parameters
for parity and completeness
of data.
• A sequence of Check is agreed
to.
• The Console Engineer prepares
his record keeping
tool, tracker, for the loops to be
checked in the agreed
upon sequence.
• The Field Technician evaluates
the test equipment
to be used, collects same and
proceeds to the first device
to be checked.
• The Field Technician
communicates to the Console
Engineer the Tag of the device he
is at
• The Console Engineer calls up
the appropriate I/O
channel
• The Console Engineer calls up
the appropriate HMI
graphic or graphics
• Transmitters
o The Field Technician reviews the
installation and
process connections to ensure
they are in accordance with
the specification details and good
installation practice.
o Either by impressed signal,
(“Pump Up”) or
Communicator command, the Field
Technician drives the
transmitter output signal through
it’s range. Slowing at
Alarm Points so the Console
Engineer can confirm alarm

14. action. (NOTE: Common is a 0%
25% 50% 75% 100% Check. This
was originally necessary to confirm
the linearity of
earlier Pneumatic and
ElectroMechanical devices, it no
longer is as critical and becomes a
matter of agreed upon
preference.)
o Any wiring and/or piping
disturbed to accomplish
signal impression is restored.
o The Field Technician confirms
the process
connection line up is as desired.
(e.g. For a Differential
Flow Transmitter to be placed in
service after check out,
the three valve manifold would
have the balance closed and
the process ports open)
• Control Loops
o While the transmitter signal
impression is
occurring, the Console Engineer
will call up the Control
Algorithm faceplate and by placing
the control mode to
Auto, determine that the output
action is appropriate.
• Control Valves
o The Field Technician reviews the
installation to
ensure it is in accordance with the
specification details
and good installation practice.
o If pneumatic, the Field
Technician opens the air
source checking for proper
pressure adjustment and air
quality.
o If electric, the Field Technician

15. energizes the
proper breaker.
o The Console Engineer adjusts
the output signal to
the valve while the Field
Technician observes the action of
the valve.
o Jointly, the Field Technician and
the Console
Engineer determine if the resultant
action is appropriate
for the control signal sent and the
previously determined
action of the control algorithm.
o Where present, the Console
Engineer observes any
feedback from the valve to be in
agreement with the
reported position of the valve
action by the Field
Technician.
o Any accessories to the valve are
checked for
proper action.
• Switches
o The Field Technician reviews the
installation to
ensure it is in accordance with the
specification details
and good installation practice.
o Either by Signal Impression,
manual toggling, or
conductor manipulation, the Field
Technician causes a
change in state of the field device
signal.
o The Console Engineer observes
the indication of
the signal to be in agreement with
the physical state as
impressed on the device by the
Field Technician.

16. • The Console Engineer records
the results of the
results of the signal impression,
alarm points, ranges,
valve actions, etc.
• If no deficiencies were noted
during the Loop
Check, the Loop Folder is placed in
the Completed Loops
File. At this point, the client signs
for the Loop as being
complete.
• The Console Engineer records
and captures any and
all deficiencies noted by either the
Field Technician or
the Console Engineer on a
sequential uniquely numbered
form
for each deficiency noted.
o This deficiency form, or “Kick
Back” is logged by
the sequential number assigned to
it in a Master Kick Back
Log maintained by the Console
Engineer
o The Kick Back form shall include
 Tag number of the deficit
device.
 Date
 Reporting Party
 Thorough description of
the symptoms noted and any
and all actions taken by the
reporting party
o Kick Back form is entered into
the Active Kick
Back file.
o The Log Number of the Kick
Back is noted in the

17. Loop Folder and the Loop Folder is
moved to the Detained
Loops File.
o The resolution team draws Kick
Back forms from the
Active Kick Back file.
o Each time the deficiency is
addressed, the Kick
Back form is submitted to the
Console Engineer.
 The Kick Back shall
include
• Date
• Resolving Party
• Thorough description of the
corrective actions
taken
• Recommendations for further
actions
• Responsible party assigned to
further actions
o When the deficiency is corrected,
the Kick Back
form is submitted to the Console
Engineer.
 The Completed Kick
Back shall include
• Date
• Resolving Party
• Thorough description of the
corrective actions
taken
Is This
Answer
Correct
?
14 Yes 1 No
Answer check the continuty,signal and sangam

18. # 5 power (depandeng on
instrument) frome fild instrumnet to
the control room.
Is This
Answer
Correct
?
16 Yes 4 No
surendra
Answer
# 6
checking out whether the reading
is coming to the connected txt.
intially d.c.s and field instrument
are connected
simulator is used to give mA to txt.
and corresponding
readin g is checked in d.c.s
whether the o/p is compared
with mA
0- 100 kg 4mA for 0kg and 20mA
for 100kg
Is This
Answer
Correct
?
15 Yes 4 No
Girish_b_k
Answer
# 7
In simple terms it is a test starting
at the process variable through the
controller and back to the control
device to see if everything is
working properly.
As as example: You have a tank
with a water level controlled by an
dnz_72

19. inlet valve that opens or closes as
needed to maintain the level.
The signal from a level device (let's
say a level transmitter) goes to a
controller. A signal then goes from
the controller to the level control
valve opening or closing it. That is
the control loop.
The loop test determines if the
proper signal is going from the
level transmitter to the controller
and then is the correct signal going
from the controller to the control
valve and is it opening or closing
as it should.
Is This
Answer
Correct
?
5 Yes 1 No
Answer
# 8
simply loop checking is check of
continuty in all wire from
location to location.
Is This
Answer
Correct
?
15 Yes 19 No

20. What is cold loop checking and hot loop checking for DCS & what is
the procedure to do this???
•
SANTHIRAJ SATHANNA
Loop checks are conducted for Inputs and Outputs as pre commissioning activities
* Loop Check
This is an electrical continuity check to confirm wiring integrity from control panel's terminal block to the
field instrument. Please note that field cabling starts from field instrument and goes through Junction boxes
and marshaling cubicle to reach termianal blocks of the control panel
* loop check
After successful cold loop check, each I/O is subjected to hot loop check. In this testing entire loop
functionality is checked by simulation of the signal with power up from DCS or PLC
* range
* of inputs / outputs / Field switches / Solenoids
* register updates
4.SCADA updates
October 26, 2013
•
Radomir Pistek
Cold loop check:
Equipment: Multimeter and similar equipment
Goal: continuity test - to check/verify/confirm the wiring continuity between the device/sensor and control
system terminal board (include all wiring way - i.e. via junction boxes). There is system power off (control
system down) and generally you will measure resistance.
Hot Loop Check:
Equipment: any type of signal simulator/generator, calibrators and so on.
Goal: After verifying cold loop check to be sure no ground/discontinuity faults is control system powered
up and all loops are Hot (Powered). Confirmation/verification that loops correspond to designed / wired
types in DCS and comparing generated values with values indicated in control system)for all types of loops
(digital input, digital ouput, flow,RTDs,Transmitters 4/20 mA or 0/10 V and so on).

21. There is also checked configuration integrity (not only signal itself) - for example, in pressure transmitter
loop, there is simulated a pressure input to the transmitter and evaluated the feedback on controller side.
This is done via pressure calibrator or manual pump with a gauage (comparing supplying pressure into the
transmitter and compare the supplied pressure with the value on in teh control system).
October 27, 2013
•
Alejandro Varga Meder
Mr. Sathanna summarized it very well.
October 28, 2013
•
Louis Reeves
Cold Loop check is used to also verify that field instruments are connected to the right DCS/PLC/SCADA
terminal inputs as well as wiring continuity This is accomplished using multi-meter resistance readings or
using 4-20 mA calibrator to test the wiring. I prefer the 4-20 mA calibrator as you can change the 4-20 mA
to verify that you have the wires. This Should be done WITHOUT the instruments and the terminal inputs
to the DCS/PLC/SCADA connected. One should also check at this time, that there are no residual
extraneous induced voltage on the signal wires. Using a volt meter in the low voltage AC mode will detect
this and help find any sources or RFI and EFI that may be present.
After that, Hot loop checks are done as previously discussed by Mr. Pistek.
March 2, 2014
•
amine kaddour
Dear rajit
The Cold loop check is a continuity check of the loop, you have to shunt the two wires of the loop in the
marshalling or the transmitter side and put the multimeter in OHM or diode mode, and check for low
resistance.
The hot loop check, you connect to your PLC or from DCS, you put the output or input in manual mode
and you force the output to(0-1) or (4-20ma) and check in the field the right value.
* the input you put a shunt or generate a 4-20ma signal and check the value in PLC or DCS.

22. Another remark: this hot loop methode is not applicable to fieldbus and hart loops.
with universal I/O from Emerson or Honeywell, the loop check will be easy, because we will not care about
signal type in marshalling, we have to plug the transmitter and configure its input(AI,AO or DI DO) with
software.
5 months ago
•
PRATAP NAIR
Dear Rajit, very detailed explanation is been shared by experts of this field.In nushell Cold stands itslef is
clear system wiring checking for its contiunity and Hot stands, actual signal generated is been transmitted
properly or not to check the entire loop system.
pre loop and loop checking
how to simulate or test ins preloop and loop checking
By aalbin on 23 November, 2012 - 10:05 am
hi
i'm asking how to simulate for preloop from the field to Process Interface Bldg. (PIB) or DCS this
instrument: the tools we been use was Hart Communicator 375, LC 100 Martel, Druck 300 DPI603,
Ametek 7975 Hand pump, megger, TK3 and can you give a drawing the typical setup of each
instrument to calibrator to simulate the preloop? i'm appreciate those who will help me. and how to
use the calibrator to simulate the instrument?
H2s gas detector
combustible Gas Detector
Corrosion XMTR and Access Fitting CM, BEACONS, HORN
TRANSMITTER HART / ANALOG - Corrosion Transmitter
DP Flow Transmitter w/ ventury, Rotameter Transmitter, Analyzer Indicator Transmitter, Agar Level
Transmitter, Vibration Transmitter, Intensity Current Transmitter, Magnetic Flow Meter, Remote
Level Indicator, Remote Temperature Indicator, Temperature Indicator Transmitter, Analyzer
Indicator Transmitter, Agar Level Transmitter, DP Level Indicator Transmitter, Vibration Transmitter,
DP Level Indicator Transmitter, Temperature Indicator Transmitter
TRANSMITTER FIELDBUS
Corrission Transmitter Fieldbus
DP Flow Transmitter w/ ventury Fieldbus
Rotameter Transmitter Fieldbus
DP Level Indicator Transmitter Fieldbus
Guide Wave Radar Level Transmitter Fieldbus
Analyzer Indicator Transmitter Fieldbus
Agar Level Transmitter Fieldbus
Vibration Transmitter Fieldbus - FFVMS Trend master 2000/ Velocity Seismo Probe
Intensity Current Transmitter
Magnetic Flow Meter Fieldbus
Remote Level Indicator Fieldbus
Remote Temperature Indicator Fieldbus
Temperature Indicator Transmitter Fieldbus

23. Analyzer Indicator Transmitter Fieldbus
Agar Level Transmitter Fieldbus
DP Level Indicator Transmitter Fieldbus
Vibration Transmitter Fieldbus
Temperature Indicator Transmitter Fieldbus
Thermocouple Temperature Transmitter
RTD Temperature Transmitter
CONTROL VALVE
ON OFF Deluge Valve
Level control valve Fieldbus
Hand Control Valve Fieldbus
Temperature Control valve Fieldbus
Pressure Control Valve Fieldbus
Level Control Valve Fieldbus
MOV FF
AOV FF
SWITCH
Pressure Switch
Level Switch
Temperature switch
Flow Switch
Pig tail
By aan aan on 23 November, 2012 - 11:59 pm
Dear aalbin,
I hope that following link will help and assist you to learn mentioned test instrument:
1. Hart Communicator 375
http://www2.emersonprocess.com/siteadmincenter/PM%20Asset%20Optimization
%20Documents/ProductReferenceAndGuides/375_ru_usermanual.pdf
2. LC 100 Martel
http://www.martelcalibrators.com/LC-110&110H_DataSheet_HR.pdf
3. Druck 300 DPI603
http://www.catrents.ca/Products/Equipment/Rental_Equipment/Instrumentation/Pressure_Test
s_and_Measurements/downloads/Druck_DPI603_Pressure_Calibrator.pdf
4. Ametek 7975
http://www.instrumart.com/assets/Ametek-MGC_manual.pdf
5. Megger
http://www.ge-mcs.com/download/sensors-and-transducers/141580.pdf
6. T3K
http://www.ge-mcs.com/download/sensors-and-transducers/141580.pdf
Please learn those documents first, try at field and if you still have anything to discuss please post
here, experts here will glad to explain more deeply.
Hope this help

24. Regards
Aan
By aalbin on 24 November, 2012 - 9:10 pm
hi
we are now loop testing a vibration what is the procedure for using tk3 bentley nevada? what is the
setup?
thank you
By Jonas Berge on 22 July, 2013 - 1:37 pm
During loop check you check the integrity of the 4-20 mA loop and the indication in the DCS
The reason for the loop check of each signal associated with each device is to ensure that:
- Validate that each signal of the device is really connected to the correct terminals and that each and
every signal associated with the device is wired correctly through the terminals in the field junction
box, to the field termination assembly in the marshalling cabinet, to the I/O card and to the correct tag
in the DCS database
- Validate that each signal of the device is not limited in the high end for example due to high
resistance caused by poor connection or corrosion on terminal at the device or field junction box
- Validate that each signal of the device is not biased due to a ground loop current caused by water or
moisture in the device housing
- Validate that there are no non-linear elements in the current loops for each signal of the device such
as signal conditioner or safety barrier with problem
- Validate that the ranging in the DCS for each signal is correct so that the correct engineering unit
value is displayed
Loop check for each signal of a transmitter is done by simulating 4/8/12/16/20 mA corresponding
0/25/50/75/100% reading. For instance, if the range is 0-800 kPa, simulating 4/8/12/16/20 mA should
result in a display of 0/200/400/600/800 kPa in the DCS.
For FOUNDATION fieldbus
- You will know that the device is connected to the correct terminals because the device automatically
appears in the system "live list" displayed with device tag, manufacturer, model number, unique
identifier and version etc. This is true also for discrete devices like intelligent two-wire on/off valves
and electric actuators / motor operated valves (MOV). All the signals associated with that device
automatically become correct so you only check the devices is there, you don't have to check signal by
signal.
- A digital signal value cannot be limited, biased, non-linear or otherwise distorted without being
detected. Therefore a 5-point loop check of each signal is not required. Instead use a portable fieldbus
tester like Relcom FBT-6 to verify device supply voltage, signal level, and noise level are within
limits thus detecting any wiring issues or water ingress etc.
Cheers,
Jonas

25. Pressure Calibrator and mA Calibration
CALOG-Pressure II is a handheld calibrator with plug-on pressure sensors for any range up
to 1000 bar. This instrument also has the functions to install and maintain all powered and
non-powered milliamp loops. It is supplied with 1 plug-on pressure sensor with optional
additional sensors available for the other pressure ranges specified below.
As a small, rugged unit with rubber protective boot, high precision and Li-ion long-lasting
rechargeable battery pack, CALOG-Pressure II is ideal for industrial field calibration. Data

26. may be logged to the removable SD card in CSV format, with user-selectable data fields and
timebase. Logged data may also be retrieved via the USB port. CALOG calibrators are made
by Instrotech and comply with CE and C-Tick EMC and EMI and Low Voltage directives.
• Features
• Specifications
• Data sheet
• Enquiry
• Online store
• Small, rugged, handheld with a protective rubber cover
• Graphic display of measured value, percent and battery status
• Measure, source and simulate 0-24 mA with 0.01% accuracy and 1
microamp resolution
• Measure 32V with 0.005% accuracy and 1mV resolution
• Continuity test function
• Trend logging with programmable timebase
• Displays values in mA and % or % and mA
• Measure complete vacuum to 1000 bar pressure
• Measures in bar, mbar, kPa, MPa, psi, m of H²O, in of H²O, ft of H²O, mm
of Hg (torr), cm of Hg, in of Hg, kg per cm² and atmospheres
• Contains a handy pressure conversion calculator
• Programmable auto-off, restart at last setting and selectable display
resolution
• Data logging to removable SD card with time and date
• USB port for access to logged data
• Lithium-ion rechargeable battery pack with 'fuel gauge' chip
• One pressure sensor included, more are optional
• Carry case, battery charger, SD card, test leads and factory calibration
certificate
• 2 year guarantee, excluding batteries

27. Calog Pressure Calibrator Kit
Pressure Calibrator display
Calog Pressure Calibrator Trend Graph

28. Calog pressure calibrator functions
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