


Vaisala MMP8 Moisture in Oil Probe
The Vaisala HUMICAP 180L2 sensor, which is designed for moisture in oil applications, is included into the Indigo-compatible MMP8 probe. The probe comes with a traceable calibration certificate that is suggested by CIGRE and can be used to measure the moisture content of a variety of oils, including transformer, hydraulic, and lubricating oils.
The MMP8 probe uses temperature (T), relative saturation (%RS), and water activity (aw) to quantify the amount of dissolved moisture in oil. Additionally, it determines the ppm concentration of particular oils. If analogue outputs, relays, or a display are required, this probe can be used as a stand-alone device with Modbus RTU communication; otherwise, it can be used with Indigo transmitters.

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- Specifications
- Features
- Downloads
Accuracy | +/-0.02 aw / 2 %RS |
Temperature Range | -70 ¦ +180 °C (-94 ¦ +356 °F) |
Vaisala MMP8 Moisture in Oil Probes:
- Excellent sensitivity in the dry end of the range
- Includes traceable calibration certificate (five points for humidity, one for temperature)
- Modbus RTU over RS-485 for flexible connectivity
- Compatible with the Indigo series transmitters
- Continuous online measurement
- Measurement range -70 … +180 °C (-94 … +356 °F)
- Measurement accuracy up to ±0.02 aw / 2 %RS
- Temperature accuracy up to 0.1 °C (0.18 °F)
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