Vaisala MM70 - Manual (Page 59)

Chapter 5 ___________________________________________ CALIBRATION AND ADJUSTMENT
NOTE If the oil sample is very dry, and the temperatures are close to each
other, it may cause inaccuracy to the calculation model. To get the
best possible performance it is recommended to use oil conditions
that represent real conditions in application. Recommendation for
sample is e.g. aw approx. 0.5 at 20 °C.
Assumptions:
The isoterm of water activity versus water concentration is linear and
the solubility curve has the form of the given equation.
Error Messages
If MM70 displays an error message, first check that the sensor is
connected properly and let the probe dry if there is condensed water in
the probe.
In case of constant error, please contact Vaisala Service Center. For
more information, see Vaisala Service Centers on page 61.
Error Message Types
Eeprom read/write error
ADC malfunction
Operating voltage out of range
Analog voltage out of range
Temperature/humidity sensor open/short circuit
Temperature sensor current leak
Temperature/humidity measurement malfunction
Temperature value out of range
Relative humidity value out of range
Sensor not found
Amplifier chain malfunction
VAISALA _______________________________________________________________________ 57