7.8 Replacing HUMICAP Sensor on HMS110/112
• New HUMICAPâ humidity sensor (HUMICAP180R or HUMICAP180V)
• New filter (always recommended when replacing the sensor)
• Medium size crosshead screwdriver (Pozidriv)
• Flat-head screwdriver
• 3 mm hex key (Allen key) for opening the radiation shield screws
You will need to remove the radiation shield to access the sensor, and this is
dicult to do while the transmitter remains mounted on a pole or wall. The
procedure below takes advantage of the detachable screw terminal to allow the
cable to remain in place during the operation.
1. Power down the transmitter.
2. Open the transmitter cover and unplug the screw terminal. This allows you to leave the
cable and cover at the installation site.
3. Remove the transmitter from its installation point.
4. Open the two long screws that hold the radiation shield, and pull them out.
5. Use a flat head screwdriver to push on the visible plastic tab below the radiation shield.
6. Tilt the radiation shield away from the opened tab. This opens the second tab on the other
side, allowing you to remove the radiation shield.
Chapter 7 – Maintenance
67
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