Vaisala MM70 User Manual download pdf (Page 61)

Chapter 6 ___________________________________________________________ MAINTENANCE

CHAPTER 6

MAINTENANCE

Changing the Filter and Sensor

1. Screw out the filter from the probe head, see Figure 2 on page 11.

2. Remove the damaged sensor by pulling it out. Handle the sensor by the

plastic socket.

3. Insert a new sensor.

4. Make a humidity calibration.

5. Screw a new filter on the probe head, take care to tighten the filter

properly (5.1 Nm).

Cleaning the Sensor

Make sure to clean the sensor before calibration and storing the

MMP78 probe. For cleaning of the probe you need instrument air and

heptane liquid. Dry with instrument air to prevent oxidation of the

sensor. The oxidation of the sensor can cause extended response times

or drifting.

1. Blow the probe head (with filter) with instrument air to remove

the remains of the oil.

2. Immerse the probe head into heptane liquid and rinse out the oil.

Plastic

socket

3. Dry the probe head with instrument air. In case you are going to

calibrate the probe, remove the filter and dry the sensor with

instrument air. Check that the sensor looks clean.

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Vaisala MM70 User Manual Page 61