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

WARNING! 

Certain conditions may prevent the performance of Diffusion Supervision and/or TruCal testing. If such a condition persists for 90 days, the XCell sensor with TruCal will recommend a calibration which is communicated through the transmitter display and LEDs. When Calibration Alert is enabled, the milli-amp signal output will also be driven to calibration alert output. Perform a calibration when the device recommends it.

Failure to follow this warning can result in serious personal injury or death.

XCell Sensor with TruCal and Diffusion Supervision (CO&H2S 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 and Calibration Alert enabled, the time between scheduled calibrations can be extended to 24 Months.

If calibration alert and/or diffusion supervision are disabled follow the calibration frequency recommendation set forth in XCell Sensor with TruCal without Diffusion Supervision (CO&H2S Only).

XCell Sensor with TruCal without Diffusion Supervision (CO&H2S 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. Without Diffusion Supervision, regular calibration of the sensor must still be conducted to confirm the sensor inlet is not obstructed.

Actual TruCal sensor performance will depend on the application, background gas exposure, and environment. To validate XCell sensors with TruCal, it is recommended that users follow their regular calibration cycle and record the “as found” and “as left” values, tracking the percent adjustment over time. Once a baseline is established, the calibration intervals can be extended until the percent adjustment is greater than the expected accuracy of the sensor.