Vaisala HMP228 Guide de l'utilisateur télécharger pdf (Page 32)

USER'S GUIDE____________________________________________________________________

0605-099

Figure 14 Device Information Submenus

Restoring Factory Settings

Factory settings can be reverted to clear all changed settings and data

memory of the indicator. Reverting factory settings does not effect on

probe calibration.

1. Open the MENU. First press the right arrow key, and then press

the OPEN key.

2. Select Settings. Press the right arrow key.

3. Select Factory Settings, press the REVERT key.

4. Answer YES to confirm reverting.

5. The power turns off automatically. When switching on again,

the factory settings are reverted. You must set the language, date

and time again. For more information, see Selecting Language

on page 27 and Setting Date and Time on page 28.

PPM-calculation

In case you have a device with a ppm-output, the ppm-value is

available as one of the quantities. The calculation model is based on

the average water solubility behaviour of transformer oils, as follows:

(A/(T+273.16)+B)

10×= awppm

Where

aw = water activity

A,B = coefficients (average/oil specific)

T = temperature (°C)

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Vaisala HMP228 Guide de l'utilisateur Page 32