Vaisala HMP228 Guide de l'utilisateur télécharger pdf (Page 44)

User's Guide _______________________________________________________________________

42 ____________________________________________________________________M210498en-A

CHAPTER 12

CALIBRATION AND ADJUSTMENT OF

MM70 SERIES PROBES

General about calibrations

The MM70 is fully calibrated as shipped from factory. Adjustment shall be

done if there is a reason to believe that device is not within the accuracy

specifications. The recommended calibration interval is one yar.

It is recommended to send the device to Vaisala Service Centres for

calibration and adjustment, see contact information on page 50.

Alternatively, user can calibrate and adjust MM70 by following the

instructions given in this chapter.

Preparations before the calibration

Before the calibration the used sensor should be cleaned with instrument

air to blow out existing oil or gently first flush with hepthane (C7H16) and

dry with instrument air. This is to decrease response time and to prevent

contamination of the salt bath and change of the reference condition. See

page 48.

NOTE

It is important to clean the sensor before calibration as the dirty

sensor can contamine the salt bath and change the reference

condition.

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Vaisala HMP228 Guide de l'utilisateur Page 44