|
OZONE MONITOR
Model PEM-OM 2 B
Model PEM-OM 2 M
Salient Features
Application
Model PEM-OM 2 B and Model PEM-OM 2 M are reliable and user-friendly instruments, which are used for continuous measurement of Ozone concentration in the ambient air or at work place such as accelerator installations and irradiation facilities. Model PEM-OM 2 B is a self-contained, battery-operated portable instrument with LCD display and comes with a built-in ethylene cylinder. Model PEM-OM 2 M is the mains operated version, with LED display, which can also be provided with a built-in ethylene cylinder on specific request.
Principle of Operation
t is a well-known fact that when Ozone reacts with ethylene, the formaldehyde molecules produced thereof are in the electronically excited state. These excited molecules return to their stable ground state by releasing energy in the form of visible light. The intensity of light so emitted is a measure of ozone concentration.
Construction
The monitor consists of a reaction chamber-photomultiplier assembly, a sampling system and an electronic unit. All the systems and components are housed in a sturdy cabinet, which comes in two alternatives viz. table top and rack mountable.
The specially designed reaction chamber is made of glass with two inlets one for sampled air and the other for ethylene. It is provided with an outlet for exhausting the reaction products. The photo-multiplier is optically coupled to the reaction chamber.
The sampling system comprises a suction pump and devices for measuring and controlling the flow of sampled air and ethylene. It also comprises charcoal traps for removing ozone for facilitating zero calibration of the monitor.
The electronic unit encompasses the High voltage supply for the photo-multiplier, signal conditioning and amplifier and other electronics for control, display and recording.
|
