Replacing HUMICAP sensor on HMS110/112 - HMD110 - HMD112 - HMS110 - HMS112 - HMW110 - HMW112 - TMD110 - TMI110 - TMW110

HMDW110 with TMI110 User Guide
Document code
M211726EN
Revision
F
Language
English
Product
HMD110
HMD112
HMS110
HMS112
HMW110
HMW112
TMD110
TMI110
TMW110
Document type
User guide
  • New HUMICAP® 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 difficult 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.
  7. Remove the filter to access the sensors.
    1
    Vaisala HUMICAP® sensor. Handle by the plastic frame.
    2
    Temperature sensor. Do not touch or attempt to remove.
    3
    Sensor socket.
    4
    Transmitter probe.
  8. Pull out the old HUMICAP® sensor and insert the new one.
  9. Perform a two-point humidity calibration on the serial line using the FCRH command.
  10. Insert the new filter.
  11. Reassemble, remount, and reconnect the transmitter.
  12. Power up the transmitter.