MMT143 moisture and temperature transmitter for oil
Compact. Rugged. Intelligent.
Ideal for OEM applications.
Reliable, durable, compact.
Continuous measurement of oil moisture
For transformer, lubrication and hydraulic oils
Excellent pressure and temperature tolerance
Powered by proven Vaisala HUMICAP® technology
Traceable calibration (certificate included)
Compatible with Vaisala Indigo80 handheld indicator and Insight PC software
Compact and intelligent
Compact form-factor installs quickly and easily in tight spaces.
Delivered fully assembled and reconfigurable to suit your needs with Vaisala Insight PC software and the Indigo80 handheld.
Water activity
MMT143 measures moisture in oil in terms of the water activity (aw), relative saturation (%RS), and temperature (T).
Water activity indicates directly whether there is a risk of free water formation.
The measurement is independent of oil type, age, and temperature.
Water content as ppm
Output in ppm conversion is readily available out-of-the-box, for most common transformer oils, including mineral.
For other transformer oils, the oil-specific conversion coefficients can be programmed into the transmitter if water solubility is known.
Key specifications
- No consumables
- Only minimal maintenance needed
- Calculates moisture content in ppm for transformer oils
- IP66-rated stainless steel construction
- RS-485 digital output with Modbus™ support
- 5–28V (digital) and 18–28V (analog) DC power
Deliveries to begin Q3/2026.
| Water activity | Temperature |
Range*:
| Range:
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Accuracy:
| Accuracy:
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| * Calculates moisture content in ppm for transformer oils |