2. MODELO DE NEGOCIOS Productos, sistemas, servicios globales, eficientes y directos/ventas, entrenamiento Detección de Gases Protección Respiratoria Soluciones de Seguridad Proveedor de Soluciones Integrales Soluciones Integrales, a través de un solo proveedor Clientes Requerimiento Yvoluc Fuego y Servicios de Emergencia Minería Gobierno Industria
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5. Detección de Gas Combustible Mezcla Metano/Aire muy rica; solamente inflamable con suministro adicional de oxigeno Ambiente Explosivo. Ignición con propagación indpendiente Mezcla Metano/Aire muy pobre. Ambiente no es inflamable . %V/V Gas (Metano) en Aire 15 5 28 Riesgo de sofocar por deficiencia de oxigeno 10 Optimum 100 % LEL Límite Superior de Explosividad (LSE /UEL} Limite inferior de Explosividad (LIE / LEL)
7. PARTES DEL INSTRUMENTO - FRENTE Pantalla LCD Alarma sonora + / Botón de menú OK / Botón de encendido Alarma visual Alarma visual Alarma visual Alarma vibratoria interna
13. Principio de los Detectores IR Luz Roja se atenua por el CH4 Si no hay luz Roja: CH4 esta presente! CH4 IR detector Air Fuente IR Cubeta de gas Filtro optical Solo Luz roja puede pasar ``
23. Detectores de Camino Abierto Instalación de Equipos en Exteriores Siempre cubriendo los lugares de mayor probabilidad de fuga (válvulas, bombas, etc.)
24. Detectores de Camino Abierto Esferas de Gas Detector IR Camino Abierto Rayo Infrarrojo Arreglo para la protección de la periferia de tanques de almacenamiento
25. Como responden los detectores de gas es igual a Diferencial en cuanto a protección perimetral se refiere
46. ¡Muchas gracias por su atención! Jose A. Llano Ventas México Tel 01 (52) 55 5277-3426 www.draeger.com www.yvoluc.com [email_address]
Notas del editor
The infrared measuring principle is easy to understand: Some gases such as bromine, chlorine or nitrogen dioxide absorb visible light of special wavelengths and so we see their colors. But considerably more gases do not absorb visible, but infrared light. At specific wavelengths the infrared radiation gets into resonance with molecular vibrations. To keep the vibrations on-going energy is needed and „extracted“ from the incoming radiation. So the gas absorbs energy and the intensity of the transmitted radiation is decreased. The trick is to have an IR-photodetector combined with an optical filter which is only transmitting the same wavelength the gas will absorb. If IR-radiation is penetrating through a containment (so-called cuvette) filled with clean air there is no absorption and so the detector will have maximum signal. If the cuvette is filled with the target gas there is more or less absorption and the detector will produce a lower signal. By calibration (which concentration produces which detector signal?) any detector signal can be associated to a gas-concentration. Polytron IR General
The infrared absorption technique operates as follows: Two wavelengths of 2.1 and 2.3 microns are sent from Transmitter to Receiver The signal wavelength (2.3 micron) is absorbed by the presence of hydrocarbon molecules, the more molecules present the greater the absorption. The greater the absorption the greater the 4-20mA output from the detector. The reference wavelength (2.1 micron) is unaffected by the presence of the gas. The presence of fog, water etc. will effect both wavelengths equally.
The spectra shown highlights that the presence of gas only absorbs the signal wavelength of 2.3 microns, the reference detector at 2.1 microns is undisturbed.
The graph highlights the infrared transmission around the 2.3 micron wavelength of propane with corresponding LELm values. Clearly the greater level of absorption the greater the corresponding value of LELm.