Moisture in Oil Measurement

The HMP229 also provides for accurate temperature measurement. It is an easy-to-install on-line transmitter which can be calibrated against traceable salt solutions.

The transmitter can be configured in many ways. It can have either a blank cover or a cover with local display and keypad with which the user can operate the transmitter. The power supply voltage can be selected from three alternatives. Two analogue output signals can be scaled and the measurement ranges changed within certain limits. The HMP228 transmitter can be supplied with two five or ten metre sensor head cable.

The HMP228 transmitter has two analogue outputs and can be connected to a serial bus via the RS 232C interface or through and RS 485./422 serial module or current loop module.

The HMP228 transmitter is a microprocessor based instrument for the measurement of moisture in terms of water activity e.g. in the lubrication of circulation systems or in transformer oil. The transmitter incorporates a capacitive thin film sensor. The operation of the sensor is based on changes in its capcacitance as the thin polymer film absorbs water molecules.

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