GfG Instrumentation 2211004 CI 21 20-200ppm NH3 Fixed Gas Transmitter
CI 21 20-200 ppm NH3 (NH3) Fixed Gas Transmitter Features: Stable long-life charge-carrier-injection sensor Sensor is unaffected by exposure to high gas concentrations Low temperature operation to -40°F Low cross-sensitivity compared to MOS sensors Low cost of ownership Utilizing a controlled sensor voltage, the CI 21 maintains a constant internal temperature, allowing accurate readings without additional heating components. The alarm threshold is set at 200 ppm, and each of the sensors is calibrated to 200 ppm NH3 at 25°C (77°F). At lower temperatures, the response of the CI 21 is extremely accurate, whereas the MOS and electrochemical sensors drift considerably. MOS sensors typically interfere with other gases and are rarely specific. Cross interferences occur with alcohol, cleaning detergents, water, CO, and many other substances. Interfering alarms become a nuisance that can lead to work stoppage and expensive shut downs.