Vaisala HMP228 User's Guide download pdf (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

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Vaisala HMP228 User's Guide Page 59