Maintenance; Improving Sensor Response Time; Removing And Fastening Probes; Fixed Probe Model - Vaisala HMT140 User Manual

5. Maintenance
5.1 Improving Sensor Response Time
To ensure maximum operating life and a fast sensor response time, replace a dirty filter. The
filter should be replaced when it is damaged or dirty. Do not attempt to clean the filter.
To change the filter:
1. Turn the filter counter-clockwise to loosen it.
2. Remove the filter from the probe.
CAUTION!
filter in place, the sensors are easily damaged – handle the probe carefully.
3. Install a new filter on the probe, and tighten it so it is finger-tight.
4. Make sure the filter sits straight and meets the threads properly.
5.2 Removing and Fastening Probes
5.2.1 Fixed Probe Model
To remove and replace a fixed probe:
1. Loosen the metal locking bushing by carefully turning it counter clockwise.
2. Remove the probe from the HMT140 by pulling it gently outwards.
3. Attach the new probe to the 4-pin M8 panel connector on the HMT140 (only one position
possible).
Be careful not to touch the sensors with the filter. Without the
Chapter 5 – Maintenance
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