MM70 Portable Humidity and Temperature Meter for checking Oil errors




Reference oil is not required for recalibration.

Easy online process check
No need to drain the oil. The probe can be inserted directly into the process pipeline through a ball valve, without draining oil into the system.

Economical operation with multiple probes
Compatible with carbon dioxide, humidity and dew point probes, making it a versatile investment applicable to various multi-parameter applications. One or two probes can be connected simultaneously.

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Instrument for: Oil (Temp & RH)
Function: Oil Filled Systems
Parameters Measured Water activity

The MM70 is an ideal tool for preventive maintenance of oil filled systems.
The water activity measurement indicates the margin of free water formation, which causes serious problems in lubrication systems. Excellent tolerance to temperature and pressure.

Independent measurement of oil type, age and temperature: indicates oil saturation margin
Online process check through ball valve, no need to drain oil
Robust and reliable construction.
Multithreaded operation; dew point and CO2 probes can also be connected
HUMICAP® Sensor - Proven Field Performance Since 1973

Water activity measurement

​Measurement range ​0 ... 1
​     0 ... 0.9 ​±0.02
​    0.9 ... 1.0 ​±0.03
​Sensor ​Vaisala HUMICAP® 180L2

Temperature measurement

​Measurement range ​-40 ... +100 °C (-40 ... +212 °F)
​Accuracy at +20 °C 
(+68 °F)

± 0.2 °C (±0.36 °F)
​Sensor ​Pt100 RTD Class F0.1 IEC 60751

Operating environment

​    Operating temperature for electronics ​-40 ... +60 °C (-40 ... +140 °F)
​    Operating pressure range
​         during installation ​max. 20 bar
​         through ball valve ​​max. 10 bar
​Operating temperature
-10 ... +40 °C (+14 ... +104 °F)
​Operating humidity ​non-condensing

Inputs and outputs


Power supply

Rechargeable NiMH battery pack with AC power or 4 x AA alkaline batteries, type IEC LR6

​Analog output ​0 ... 1 VDC
​Data interface ​RS-232
​Menu languages ​English, French, Spanish, German, Swedish, Finnish, Russian, Japanese, Chinese


​   Probe
​   Housing classification ​IP65 (NEMA 4)
​    Housing material ​ABS/PC blend
​    Probe material ​Stainless steel (AISI3166L)
​    Cable length between probe and indicator
1.9 m, 10 m extension available
​    Weigth ​506 g
​    Housing classification ​IP54
​    Weight ​400 g
​    Probe inputs ​1 or 2

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