Calibration Frequency for XCel 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 milliamp 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.