Restoring factory settings, Ppm-calculation, Figure 14 – Vaisala MM70 User Manual
Page 32: Device information submenus
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
×
=
aw
ppm
Where
aw = water activity
A,B = coefficients (average/oil specific)
T = temperature
(°C)
30 __________________________________________________________________ M210498EN-C