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EX-5155 Explosionproof Sensor/Transmitter for PPM Toxic Hydrocarbons and Organic Solvents
Solid-State MOS Sensor
Three Alarm LEDs
NEMA-4X, NEMA 7 and IP66 Rated Enclosure
24 VDC, 4-20 mA
Liquid Crystal Display
Non-Intrusive Calibration
Approved for Class I, Division 1, Groups B, C, & D
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 EX-5155 can provide ppm level monitoring capability for detecting certain common toxic gases, including NH3, CO, H2S, in addition to a wide range of hydrocarbons and organic solvents.
MOS sensors operate at lower temperatures than catalytic type 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 catalytic sensors and also influence the performance of MOS sensors under certain conditions. Applications for monitoring of hydrocarbon gases where silicones are present in the environment should be discussed with ENMET.
Examples of Some Typical Calibrations
Gas/Vapor
Range
Acetone
2000 ppm
Ammonia
300 ppm
Methyl alcohol
400 ppm
Methyl chloride
200 ppm
Toluene
400 ppm
MEK
400 ppm
Styrene
100 ppm
1,1,1,2-Tetrafluoroethane
2000 ppm
Methyl perfluoropropyl ether
2000 ppm
Methylene chloride
200 ppm
Xylene
400 ppm
In general, the EX-5155 can be calibrated for ppm concentrations of Hydrocarbons, Halogenated Hydrocarbons, Jet Fuels, Refrigerants, Organic Solvents, Esters, Ethers, Alcohols, Ketones, and other compounds and mixtures.
Specifications
Voltage:
24 Vdc, Loop powered
Output:
4-20 mA
Installation:
3-wire, typically 16 to 18 AWG, depending upon distance.
Connection:
1/2 inch NPT, conduit
Display:
8-character, single-line, backlit LCD
Alarm Indicators:
3 LEDs at programmable set points
Menu/Calibration:
Magnet actuated switches
Sensor:
Metal Oxide Semiconductor (MOS)
Approvals
Approved for Class I, Div. 1, Groups B,C, & D Classified to: UL 916 (3rd ed.) and UL 1203 (4th ed.) CSA 22.2, No. 0-M91, 30-M1986 and 142-M1987
For more information including drawings and ordering information see product literature: EX-5155 Literature
MOS sensors operate at lower temperatures than catalytic type 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 catalytic sensors and also influence the performance of MOS sensors under certain conditions. Applications for monitoring of hydrocarbon gases where silicones are present in the environment should be discussed with ENMET.
