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EX-5150-MOS Sensor/Transmitter for PPM Hydrocarbons and Organic Solvents
Solid-state sensor
Explosionproof design
NEMA-4x enclosure
4-20 mA output
Liquid crystal display
Non-intrusive calibration
An MOS sensor consists of a heated mixed metal oxide element that decreases in resistance in the presence of many gases and vapors. These sensors are broad range in their response characteristics. Different types of MOS sensors are available which can be optimized for a particular gas, but they are inherently non-specific.
The MOS sensor can provide monitoring capability similar to that of the classic catalytic bead or hot-wire sensor, but it can be calibrated for either % LEL or ppm detection levels of a wide range of hydrocarbons and organic solvents. The MOS sensor can also be used for detecting certain common toxic gases, including NH3, CO, H2S, etc.
MOS sensors operate at lower temperatures than catalytic bead/hot-wire sensors, which makes them less prone to poisoning. The MOS sensor is therefore the sensor of choice in applications where, for example, lead, phosphates or sulfur-containing compounds are present. Silicones, which are used in a wide range of oils, lubricants, adhesives, and many other products, can poison hot-wire sensors and also influence the performance of MOS sensors under certain conditions. Applications for monitoring of hydrogen and hydrocarbon gases where silicones are present in the environment should be discussed with ENMET.
Examples of Some Typical Calibrations
Toxic
Combustible
Gas/Vapor
Range
Gas/Vapor
Range
Acetone
2000 ppm
Acetone
50%LEL
Ammonia
300 ppm
Isopropyl Alcohol
50%LEL
Methyl Alcohol
500 ppm
Propane
50%LEL
Methyl Chloride
200 ppm
Ethyl Alcohol
50%LEL
Toluene
500 ppm
Toluene
50%LEL
MEK
400 ppm
Gasoline
50%LEL
Styrene
100 ppm
Butane
50%LEL
R-134A
1000 ppm
Methane
50%LEL
Cyclohexanone
200 ppm
Stoddard Solvent
50%LEL
Methylene chloride
200 ppm
Styrene
50%LEL
Xylene
400 ppm
Xylene
50%LEL
In general, the EX-5150-MOS can be calibrated for Combustible Hydrocarbons, Halogenated Hydrocarbons, Jet Fuels, Refrigerants, Organic Solvents, Esters, Ethers, Alcohols, Ketones, CO, H2S, and other compounds and mixtures.
Specifications
Voltage:
24 Vdc, Loop powered
Output:
4-20 mA
Installation:
3-wire, typically 16 - 18 AWG, depending upon distance.
Connection:
1/2 inch NPT, conduit
Display:
8-character, single-line, backlit LCD
Alarm Indicators:
LEDs
Menu/Calibration:
Magnet actuated switches
Sensor:
Metal Oxide Semiconductor (MOS)
For more information including drawings and ordering information see product literature: EX-5150-MOS Literature
MOS sensors operate at lower temperatures than catalytic bead/hot-wire sensors, which makes them less prone to poisoning. The MOS sensor is therefore the sensor of choice in applications where, for example, lead, phosphates or sulfur-containing compounds are present. Silicones, which are used in a wide range of oils, lubricants, adhesives, and many other products, can poison hot-wire sensors and also influence the performance of MOS sensors under certain conditions. Applications for monitoring of hydrogen and hydrocarbon gases where silicones are present in the environment should be discussed with ENMET.
