Vaisala MMP8 Moisture in Oil Probe

Key benefits

Robust & reliable out of the box

Reliability. That’s MMP8. Its latest-generation Vaisala HUMICAP® 180L2 sensor, is the result of over 20 years of field experience. Its excellent chemical tolerance provides accurate and reliable measurement over a wide measurement range, with outstanding sensitivity in the dry end — making it ideal for transformer applications.

Measure the margin to water saturation

Water activity or relative saturation directly indicate whether there is a risk of free-water formation. This data is relevant in lubrication oil applications where detecting water ingress and preventing free water formation is crucial. The measurement is independent of oil type and age.

In addition to water activity, MMP8 can output ppm water content. This conversion is readily available for mineral transformer oil and other oil-specific conversion coefficients can be calculated if the water solubility of the oil is known and the solubility characteristics remain constant.

Easy installation

The MMP8 can be installed (and removed) even while a process is running — thanks to its ball-valve installation kit. Its probe installation depth is adjustable and pressure fitting options are ISO 1/2″ and NPT 1/2″. The MMP8 is delivered with a manual pressing handle that allows the probe to be pushed against process pressure.

Superb connectivity

Standalone. The MMP8’s smart measurement and digital Modbus RTU over RS-485 connection within the probe fully support standalone use.

Indigo-connected. The MMP8 is a part of the Vaisala Indigo family, which offers a robust display for data visualization, easy access to probe configuration, and more extensive options for connectivity, supply voltage and wiring.

Easily configurable. Whether using the MMP8 on its own or with an Indigo transmitter, the Vaisala Insight software offers easy field calibration, probe configuration, and device analytics.