Vaisala DMT143 - Maintenance; Visual Check; Cleaning the HUMICAP sensor

Procedure Instruction 11(16)
Field Tech Manual for DMT143-series
2018-04-06
Vaisala Instruments
Maintenance
5.1 Visual Check
This tasks should take into consideration at least following issues:
- Surface (materials)
- Oxidation, water leaking
- Sensors
- Cables (if any), cable heads
- Connectors
- Cleaning
5.2 Cleaning the HUMICAP sensor
The body of the transmitter can be cleaned by wiping with a moistened lint-free cloth. Do not immerse
the transmitter in liquid, and do not use cleaning agents or solvents.
When replacing the filter, wear clean gloves to avoid depositing dirt or oil on the filter. Inspect the
sealing ring for damage (used with ISO thread only), and replace it if necessary. Be careful when
changing the filter, since it is easy to break the sensor when the filter is removed.
Replace the filter as follows:
1. Turn the filter counterclockwise until it is loose.
2. Pull the filter straight out carefully. Do not damage the sensor.
3. Take the new filter, and insert it to the filter thread.
4. Tighten the new filter to 5 Nm by turning it clockwise.