Calibration Frequency for XCell Sensors with TruCal and Diffusion Supervision (H2S & CO only)

Sensors with TruCal technology will adjust sensitivity without any manual intervention or calibration, unless called for by the sensor. If the adjusted sensitivity from TruCal deviates too far from the last gas calibration sensitivity, the sensor will recommend or, in extreme cases, require a calibration. When a calibration is recommended, the transmitter LED status indicators slowly pulse green. Users can also enable a Calibration Alert function that will send a milli-amp signal on the analog output to the control room when a calibration is recommended. When a calibration is required, the status LEDs will flash yellow and the transmitter will go into a Calibration Required Fault. With Diffusion Supervision enabled, the sensors also actively monitor the sensor inlet for obstructions and initiates a fault if the gas diffusion path becomes obstructed.

With Diffusion Supervision and Calibration Alert enabled, the time between scheduled calibrations can be extended to 24 months.

If calibration and/or Diffusion Supervision are disabled, follow the calibration frequency recommendations set forth in Calibration Frequency for XCell Sensors with TruCal without Diffusion Supervision (H2S & CO only).