4.10 MMP8 probe
136 [5.35]
Probe cable 2 m [6.56 ft]
Ø 25
[0.98]
M12/5
Ø 5
[0.2]
262 [10.32]
224 [8.82]
35 ... 179 [1.37 ... 7.05]
35 [1.37]
Ø 13.5
[0.53]
Fitting body
ISO1/2” or NPT1/2”
Ø 12
[0.47]
mm
[in]
Figure 17 MMP8 dimensions
Vaisala HUMICAPâ Moisture in Oil Probe MMP8 enables fast and reliable measurement of
moisture in oil. It uses proven Vaisala HUMICAPâ sensor that was developed for demanding
dissolved moisture measurements in transformer and lubrication oils, hydraulic fluids, and
other liquids.
MMP8 measures dissolved moisture in oil in terms of the water activity (a
w
), relative saturation
(%RS), and temperature (T). Water activity or relative saturation indicate directly 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.
MMP8 can also output ppm, the average mass concentration of water in oil. Vaisala has this
conversion readily available for specific oils, including mineral transformer oil. This allows
continuous measurement of ppm concentration in power transformer condition monitoring.
• Temperature measurement range −40 … +180 °C (−40 … +356 °F)
When installed with the ball valve kit, the MMP8 is ideal for installation into processes where
the probe needs to be installed or removed while the process is running. Probe installation
depth is adjustable. Pressure fitting options are ISO 1/2" and NPT 1/2". MMP8 is delivered with
a manual pressing handle that allows the probe to be pushed against process pressure.
For installation instructions of the ball valve see Attaching ball valve kit to process (page 30).
HMP Series with MMP8 and TMP1 User Guide M212022EN-F
36
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