Sensor Maintenance

WARNING! 

•

Follow proper ESD precautions when handling the printed circuit boards. This device uses semiconductors which can be damaged by electrostatic discharge.

•

Remove power before opening, servicing and maintaining the monitor.

Failure to follow these warnings can result in serious personal injury or death.

Replacing the Sensor Module

The X-Series Refrigerant Monitors are compatible with pre-calibrated sensor modules which maintain the sensor’s gas type and calibration information. To replace the refrigerant monitor’s sensor module:

1.

Power-down the refrigerant monitor.

2.

Using a 5/32” (4mm) hex key / allen wrench (not included), loosen the faceplate screws and remove the lid.

3.

Unplug the INTERNAL SENSOR connection from the main circuit board. See Connection 4 in X30 PCB Layout and Components for X30 or Connection 5 in X50 PCB Layout and Components for X50 models.

4.

Using a standard screwdriver head, carefully loosen the screws on the four corners of the PCB, including the one attached to the grounding lanyard. Set carefully to the side in a safe area.

5.

Remove the installed sensor module from the lid by holding onto the housing and turning counter-clockwise 90°. Take care not to apply excessive force to the sensor module’s circuit board. When the square tab of the sensor housing is aligned with the lock icon, firmly pull the module to remove it from the housing.

6.

Install the new sensor module by aligning the square tab with the lock icon before firmly pressing it into the enclosure. Taking care not to apply excessive force to the sensor module’s circuit board, rotate the sensor module clockwise 90° (or until the triangle icon aligns with the lock icon on the lid).

7.

Feed the black wire from the sensor module through the PCBA opening and insert the connector into the INTERNAL SENSOR terminal. Replace the PCB. Then, tighten the four screws to secure it. Place the lid back onto the base and secure all service loops within the back box.

8.

Tighten the lid using the supplied hardware in an “X” pattern. Tightening torque should be uniformly applied at 10 in-lbs or 1.13 Nm.

9.

Power-up the refrigerant monitor.

10.

After the start-up sequence has finished, check the sensor response with a bump test or full calibration to ensure functionality. If the sensor type has changed from the original selection, refer to the mobile app or modbus registers to modify the sensor configuration setting.

NOTE: For video instructions on how to replace a sensor module, consult MSASafety.com.