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Solid-State NH3 Ammonia Sensor / Transmitter

 

Model SS-M-NH3-N/1 (Master/Slave)

 

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This sensor uses a porous metal oxide with catalyst that is heated by a small internal heater.

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The sensor exhibits a large decrease in resistance when exposed to NH3 gas, and gives a 4/20-mA output, non-linear.

 

Characteristics

 

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This sensor has a long life, five to ten years.

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The sensor life is shortened three to four months, if exposed continuously to interference gas. 

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The sensor will normally become more sensitive as it ages.

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The sensor has broad-spectrum characteristics, i.e., it will sense other gases, such as methane, products of combustion, propane, butane, ethylene, chlorine, hydrogen, carbon monoxide, some refrigerants, paint vapors, solvents etc...

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It is best used for trip levels in the 150/300 PPM range, up to 1% (10,000 PPM), due to its sensitivity to other gases.

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It requires modification if used in temperatures of -15 F or below.

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Keep the sensor away from high moisture changes, i.e., defrost vapor and high air movement.

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It should be checked with certified calibration gas at least once every six months.

 

Applications

 

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This sensor is ideal for machine rooms with outside fresh air make-up where no other gases are present, i.e., carbon monoxide from cars or trucks.

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It is good for isolated vessel rooms.

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It is ideal for most attic spaces.

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It is good for refrigerated rooms in which the floors are not washed with alcohol-based cleaners and where products are stored that do not give off gases.

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DO NOT apply where smoked meats, bananas and other fruits or vegetables are stored.

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Gas-driven lifts cannot be used around solid-state sensors.

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It is NOT good for low PPM set points, below 150 PPM, wash down areas, food processing rooms, rooms where cleaning solvents are used, etc.

 

 

 

Copyright [2003] [R.M. Technologies Inc.]

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