Honeywell Citicel

Industrial gas sensors are purposefully designed to measure a variety of toxic and combustible gases to help keep workers safe in harsh commercial and factory environments.

All iseries sensors have the same form factor, pin-out, supply voltage and communication protocol, hence they are interchangeable.

• All sensors in the range will work with a supply voltage from 3.1 V to 3.3 V (between V+ and V-)
• The sensor has a UART protocol to communicate with the instrument with chip select option
• All intelligent sensors have the same dimensions and communication protocol, regardless of the type of technology

All iseries sensors are calibrated during manufacturing, when the calibration data is programmed into the sensor. The sensors are fully calibrated when the sensors are installed using the recommended sealing and mounting proceedings (refer to sensor mounting application note). For the calibration to be valid in all instrument types, it is often necessary to compensate for the effects of external replaceable membranes, pumps or sampling systems on the sensor reading. The effects of these are very dependent on the gas type. To account for these effects, a compensation factor (also called User Factor) must be implemented. All iseries sensors are pre-calibrated. A pre-calibrated sensor becomes fully calibrated when a User Factor (UF) measurement has been provided for the instrument, and Honeywell has inputted the User Factor into an allocated User Factor Index (this process is done during manufacturing). The defined UF will help identify what type of instrument it is, and in this manner, the installed sensor will be fully compensated and calibrated.

The OEM lock is a lock code that is set between your instrument and sensor. It allows you to verify that no other sensor (other than yours) can work on your instrument, i.e. the sensor needs to be purchased directly from you. OEM code is set by Honeywell during sensor manufacturing with the code to be provided by the OEM.

Under no circumstances should intelligent sensor pads be soldered to, as this can cause irreversible damage to the sensor.

The ADC converter is 16 bits with multiple measuring ranges; however, the output resolution depends on the type of sensor, for the first wave of sensors, the resolutions are:

• CO: 1 ppm
• H2S: 0.1 ppm
• SO2: 0.1 ppm
• LEL: 1% LEL
• O2: 0.1% O2