This sensor utilizes a disposable electrochemical sensor that is easily replaced by simply unplugging the old sensor and plugging in a new one.  Estimated time it takes to change sensor is approximately 30 seconds.

The sensor has a matching pre-amplifier electronics unit that provides a linear 4/20-mA signal.

When exposed to NH3, the electrochemical cell outputs a signal that is proportional to the gas concentration.

Because of the electrochemical sensor's selectivity, it is excellent for low PPM trip levels, 25 to 50 PPM.

The best range to consider is the 0-100 PPM unit.

Electrochemical sensor life is normally two and a half (2½) to three and a half (3½) years in a cool environment, i.e., below 60°F.

In hot machine room environments, the life will shorten to about one (1) year.

Even though the sensor can be exposed to high concentrations of NH3 with minimal loss of life, extremely high concentrations over hours of exposure can deplete the sensor.

As this sensor ages, it will become less sensitive.

This sensor must be tested more often than the solid-state sensor because it can "fail silently".

We recommend testing the sensor a minimum of once a month and more often if the area protected is highly critical. Consider two (2) sensors for extremely critical areas.

The electrochemical sensor exhibits very selective characteristics to NH3, food processing environments, moisture and low temperatures.  There is no better method for NH3 detection at present.

Electrochemical sensors require special modifications in the following areas:

This sensor is ideal for processing rooms, refrigerated rooms, blast freezers, and in rooms where gas-driven forklifts are used.

The electrochemical sensor is ideal for refrigerated rooms where fruit is stored, as the sensor does not respond to ethylene gas.

Ice cream room applications are ideal because of the sensor's ability to sense at low PPM levels, 25 to 35 PPM.

Stainless steel housings are available for wash down areas, if required.