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Monitoring moisture in oil
Vaisala HUMICAP were the first capacitive sensors to measure moisture in oil online. Since then, they have become a true industry standard.
The sensors were specifically designed to measure even very low moisture contents in mineral, vegetable and synthetic oils. The HUMICAP sensors, which are manufactured in Vaisala's own clean rooms, are used all over the world and even on Mars.
Uniquely robust oil moisture sensors
Stable reliability
- Accurate measurements of water saturation and ppm under rapidly changing conditions.
- All devices are supplied with NIST or accredited calibration and can be calibrated on site.
- No moving parts in transducers.
Long-term stability
- Thin film polymer sensor design protects against contamination and is highly selective to water.
- Capacitive technology ensures long-term stability of measurements.
- Insensitive to additives or impurities in oil.
- Automatic recovery after complete saturation.
Fast response time
- In-situ real-time measurement of moisture in oil as actual relative saturation (%rS).
- Sampling and laboratory analysis of moisture not required.
- Simple installation via ball valve.
- Can also be installed in live transformers.
MMP8 measuring probe for oil moisture
The proven Vaisala HUMICAP® sensor is used in the oil moisture probe. This was developed for demanding moisture measurements.
MMP8 - for demanding and continuous online moisture measurements in transformer and lubricating oils, hydraulic fluids and other liquids
The MMP8 oil moisture probe ensures fast and reliable measurements of the moisture content in oils.
- Continuous online measurement of oil moisture and temperature
- Temperature measuring range - 40 °C ... + 180 °C
- Measuring accuracy up to ±0.01aw (±1 % rS)
- HUMICAP sensor - proven for more than 15 years for moisture measurements in oil
- Modbus RTU via RS-485
Data sheet MMP8


Sensor for measuring moisture in oil with Indigo520 transducer
Standalone application or in combination with Vaisala Indigo
Indigo and Insight compatible
The probe can be connected to Vaisala Indigo transmitters and the Indigo80 handheld device to extend the range of available functions.
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