Vaisala HMDW80 - Manual (Page 36)

User's Guide _______________________________________________________________________
34 ___________________________________________________________________ M211510EN-C
Replacing the INTERCAP
®
Humidity Sensor
HMDW80 series transmitters use the Vaisala INTERCAP ® sensor for
humidity measurement. The INTERCAP ® sensor is designed to be
replaced when necessary, and does not require adjustment by the user.
Replacing the INTERCAP ® Sensor on
Models HMD82/83 and HMW88/89
REQUIRED
TOOLS
- New INTERCAP ® humidity sensor.
- New filter (always recommended when replacing the sensor).
- Duct models only: medium size crosshead screwdriver (Pozidriv).
1. Power down the transmitter.
2. Duct models only: loosen the tightening screw on the fastening
flange, and pull the probe out of the duct.
3. Remove the filter to access the sensors. See Figure 20 below.
4. Pull out the old INTERCAP ® sensor, and insert the new one.
5. Insert the new filter.
6. Duct models only: push the probe back into the duct, to the same
depth where it was before. Tighten the tightening screw on the
fastening flange.
7. Power up the transmitter.
8. Verify that the transmitter now provides a valid humidity reading.
1305-024
Figure 20 Sensors on HMD82/83 and HMW88/89 Models
1 = Vaisala INTERCAP® sensor. Handle by the plastic frame.
2 = Temperature sensor. Do not touch or attempt to remove.
3 = Sensor socket.
4 = Transmitter probe.
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