Vaisala HMP228 Podręcznik Użytkownika Pobierz pdf (Strona 50)

User's Guide _______________________________________________________________________

48 ____________________________________________________________________M210498en-A

CHAPTER 14

MAINTENANCE

Changing the filter and sensor

1. Screw out the filter from the probe head (figure on page 7).

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).

Clean the sensor before storing the MMP78 probe

and before calibration

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.

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.

Plastic

socket

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Vaisala HMP228 Podręcznik Użytkownika Strona 50