WirelessHART Toxic & Combustible Gas Detector
IM_TCD60-01
www.ueonline.com/vanguard
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4.0 FIELD REPLACEMENT
4.1 Sensor Replacement
The sensor is certified intrinsically safe. Sensor replacement may be performed in the field without a hot
work permit.
Only FLEXsense™ sensors provided by United Electric Controls are compatible with this device.
Do not attempt to disassemble the sensor as this could damage the sensor and void hazardous location
approvals, and manufacturer warranty.
Sensors must be activated after installation.
When replacing the sensor, proper care should be taken to ensure that surrounding environment is free
of toxic or combustible gases. It is recommended that other gas detection be deployed during sensor
replacement to prevent explosion, serious injury or death.
Locate the FLEXsense™ sensor housing (see Figure 41) and retract the sensor locking pin, twisting 90 degrees
to lock into retracted position. Remove the gas sensor assembly by firmly pulling downward and releasing
it from the sensor unit (see Figure 42). Remove the new FLEXsense™ sensor from its package and follow the
instructions from Section 2.2 Sensor Installation.
Note: It is not necessary to remove the battery during sensor replacement.
UE recommends performing the sensor calibration procedure as outlined in Section 3.2 Sensor Calibration &
Bump Test.
Figure 42
Figure 41