Vaisala MM70 Portable Moisture in Oil Meter – Discontinued

Vaisala MM70 Portable Moisture in Oil Meter – Discontinued

The Vaisala MM70 was a portable meter for spot-checking water activity and temperature in transformer, lubrication and hydraulic oils.

  • Discontinued product; not recommended for new purchases
  • Legacy MI70 handheld indicator with MMP78 moisture-in-oil probe
  • Water-activity measurement from 0 to 1 aw
  • Temperature measurement from −40 to +100 °C
  • Direct insertion through a ball valve without draining the process
  • Numerical display, trend graph and portable data logging

Legacy Portable Moisture-in-Oil Measurement

The Vaisala MM70 combined the MI70 handheld indicator with the MMP78 probe for portable measurement of dissolved moisture and temperature in oil. It was commonly used for spot checks, process comparisons, oil-condition investigations and verification of permanently installed moisture transmitters.

The long adjustable probe could be installed through a ball valve, allowing measurements directly in a pressurised oil line without draining the process. Measurements could be viewed numerically or graphically and recorded in the MI70 indicator for transfer to a PC.

Discontinued model: Vaisala has replaced MM70 with the Indigo80 handheld indicator and MMP8 moisture-in-oil probe. Existing MM70 systems may remain useful, but MMP78 probe, MI70 accessory and service availability should be confirmed before further investment.

What MM70 Measured

ParameterMeaningApplication value
Water activity, aw Relative indication of dissolved moisture from 0 to 1 Shows how close the oil is to saturation and the risk of free-water formation
Relative saturation, %RS Water activity expressed from 0 to 100% Provides an intuitive saturation-based moisture trend
Temperature Oil temperature at the measurement point Needed because the water-holding capacity of oil changes with temperature
Water concentration, ppmw Calculated mass concentration using oil-specific solubility information Useful where specifications and historical records are expressed in ppm

Legacy MM70 Measurement Specifications

SpecificationMMP78 probe
Water-activity range 0 to 1 aw
Standard accuracy from 0 to 0.9 aw ±0.02 aw
Standard accuracy from 0.9 to 1.0 aw ±0.03 aw
Maximum achievable accuracy from 0 to 0.9 aw ±0.01 aw with high-quality certified calibration standards
Maximum achievable accuracy from 0.9 to 1.0 aw ±0.02 aw with high-quality certified calibration standards
Response time 10 minutes, T90, at +20 °C in still oil
Moisture sensor Vaisala HUMICAP® 180L2
Temperature range −40 to +100 °C
Typical temperature accuracy at +20 °C ±0.2 °C
Recommended recalibration interval One year

Legacy Operating and Mechanical Specifications

SpecificationMM70 provision
MMP78 electronics temperature −40 to +60 °C
Operating pressure Up to 20 bar
Pressure during ball-valve installation Up to 10 bar
Maximum oil flow 1 m/s
Probe protection IP65
Probe material AISI 316L stainless steel
Probe cable 1.9 m; 10 m extension was available
MI70 operating temperature −10 to +40 °C
MI70 protection IP54
Probe inputs Up to two compatible probes
Data logging Up to 2700 real-time data points
PC connection MI70 Link with USB or serial cable

MM70 and Indigo80 with MMP8 Comparison

Selection pointMM70 with MMP78Indigo80 with MMP8
Lifecycle Discontinued handheld platform Replacement platform for new portable moisture-in-oil systems
Indicator MI70 Indigo80 colour handheld indicator
Moisture probe MMP78 MMP8, available in standard and long versions
Water-activity range 0 to 1 aw 0 to 1 aw
Water-activity accuracy Typically ±0.02 aw from 0 to 0.9 ±0.01 aw from 0 to 0.5 under specified conditions
Temperature range −40 to +100 °C −40 to +180 °C at the probe head
Temperature accuracy at +20 °C ±0.2 °C ±0.2 °C
Output parameters Water activity, temperature and calculated ppm for configured oils Water activity, relative saturation, temperature and water concentration in oil
Portable functions Numerical display, graphing and MI70 logging Modern display, diagnostics, configuration and data logging
PC software MI70 Link Vaisala Insight
Fixed installation Primarily portable system MMP8 can also connect to a compatible Indigo transmitter

Select the Replacement Arrangement

ApplicationRecommended starting pointSelection note
Portable spot checks Indigo80 with MMP8 Closest current replacement for the MM70 portable workflow
Long insertion requirement Indigo80 with long MMP8 Use the 448 mm probe version where the standard 262 mm probe is insufficient
Continuous local measurement MMP8 with Indigo200 or Indigo300 Adds transmitter power, display and automation outputs according to model
Flagship industrial installation MMP8 with Indigo510 or Indigo520 Adds robust transmitter housing and expanded integration options
Product information Explore Vaisala MMP8   Explore Vaisala Indigo80   Explore Vaisala Indigo200   Explore Vaisala Indigo500

Typical Oil Applications

Oil or systemMeasurement objectiveImportant consideration
Transformer oil Track dissolved moisture and free-water risk Use suitable ppmw coefficients where mass concentration is required
Lubricating oil Detect water ingress and support oil-condition decisions Trend water activity together with oil temperature and operating state
Hydraulic fluid Identify moisture loading that may affect fluid and component life Choose a representative pressurised-line measurement point
Oil purification or drying Verify moisture removal and process endpoint Measure before and after treatment under comparable conditions
Marine and rotating equipment Investigate ingress and changes during operation Consider vibration, access, pressure and installation safety

Understanding Water Activity and ppm

Water activity directly indicates the proximity of the oil to saturation. A value approaching 1 aw means the oil is approaching the point where free water may form at the measured temperature. Because saturation changes with temperature and oil condition, water activity is particularly useful for assessing immediate moisture risk.

A ppmw value estimates the mass concentration of water in oil. The conversion depends on oil solubility behaviour, so the correct oil-specific coefficients should be used where accurate ppm values are required. Indigo80 or Vaisala Insight can be used to configure suitable coefficients for MMP8.

Existing MM70 Migration Checks

  1. Record the MI70 indicator, MMP78 probe, fitting, ball valve and cable item codes.
  2. Confirm the oil type, normal temperature, pressure and flow at the measurement point.
  3. Record the required insertion depth and available clearance around the valve.
  4. Confirm whether water activity, relative saturation, temperature or ppmw is required.
  5. Review any oil-specific ppm coefficients used with the legacy instrument.
  6. Select the standard or long MMP8 and the correct process fitting.
  7. Do not assume every MM70 fitting or accessory transfers directly to MMP8.
  8. Compare the old and new instruments at the same stable oil condition before retiring MM70.

Vaisala MM70 Replacement Support in Malaysia

Seacom Process Instruments supports users of the discontinued Vaisala MM70 Portable Moisture in Oil Meter in Malaysia and supplies the Indigo80 handheld indicator with MMP8 probe for new portable moisture-in-oil applications.

Our team can assist with probe-length selection, process fittings, ball-valve installation, oil-specific ppm coefficients, portable data logging, fixed Indigo transmitter options, commissioning and calibration planning.

Replacing an MM70? Send Seacom photographs of the MI70, MMP78 label, process fitting and ball valve, together with the oil type, temperature, pressure, insertion depth and required measurement parameters. We will help check the suitable Indigo80 and MMP8 configuration.

Download

  MMP8 Catalogue   (190.61k)

  MM70 Catalogue   (459.72k)

  MM70 Order Form   (488.58k)

  Indigo80 Catalogue   (369.55k)


Specific References

You Might Also Like

.

Vaisala MMT330 Moisture in Oil Transmitter Series – Discontinued

Vaisala MMT330 Moisture in Oil Transmitter Series – Discontinued

Vaisala MMT330 Moisture in Oil Transmitter Series – Discontinued

The Vaisala MMT330 Series provided continuous measurement of moisture and temperature in transformer oil, lubrication oil, hydraulic fluid and other liquid hydrocarbons.

  • Discontinued series; not recommended for new installations
  • Legacy MMT332, MMT337 and MMT338 probe configurations
  • Measures water activity, relative saturation, temperature and calculated ppm
  • Graphical display, data logging and versatile analogue or digital outputs
  • Used for oil-condition monitoring, dryer control and free-water risk detection
  • Use Vaisala MMP8 with an Indigo transmitter for new installations
Vaisala MMT310 Moisture and Temperature Transmitter for Oil

Vaisala MMT310 Moisture and Temperature Transmitter for Oil

Vaisala HUMICAP® MMT310 Series provides continuous online measurement of moisture and temperature in transformer, lubrication and hydraulic oils.

The compact transmitter measures water activity (aw) or relative saturation (%RS), showing how close the oil is to forming free water. Optional ppm calculation is available for mineral transformer oil and configured oil types.

  • Models MMT317 and MMT318
  • Water activity range: 0 to 1 aw
  • Temperature range: -40 to +180°C
  • Two configurable analogue outputs and RS-232C
  • Up to 40 bar with MMT318 and ball-valve installation
  • IP66 compact transmitter enclosure
  • Traceable calibration certificates included

6 other products in the same category:

.

Vaisala MMP8 Moisture in Oil and Temperature Probe

Vaisala MMP8 Moisture in Oil and Temperature Probe

Vaisala MMP8 Moisture in Oil and Temperature Probe

The Vaisala MMP8 provides continuous online measurement of dissolved moisture and temperature in transformer oil, lubrication oil, hydraulic fluid and other liquid hydrocarbons.

  • Measures water activity from 0 to 1 aw, relative saturation, temperature and ppmw
  • Dry-end accuracy up to ±0.01 aw or ±1%RS
  • Temperature measurement from −40 to +180 °C
  • Available in standard 262 mm and long 448 mm probe versions
  • Adjustable insertion depth with ISO 1/2 or NPT 1/2 process fittings
  • Standalone Modbus RTU or connection to Vaisala Indigo transmitters
  • Ask Seacom about the suitable MMP8 configuration
Indigo200 Series Transmitters for Vaisala smart probes for Vaisala Smart Probes

Vaisala Indigo200 Series Transmitters

Vaisala Indigo200 Series Transmitters

The Vaisala Indigo200 Series is the standard transmitter platform for one interchangeable Indigo-compatible smart probe, providing local display and practical automation-system connectivity.

  • Indigo201 with three analog outputs and two relays
  • Indigo202 with Modbus RTU and two relays
  • Colour display with numerical and graphical views
  • IP65 enclosure for industrial measurement applications
Vaisala Indigo510 Indigo520 Malaysia

Vaisala Indigo510 and Indigo520 Flagship Transmitters

Vaisala Indigo510 and Indigo520 Flagship Transmitters

The Vaisala Indigo500 Series provides flagship industrial measurement integration: choose Indigo510 for a simplified single-probe system or Indigo520 for full dual-probe capability.

  • Indigo510: one probe and two isolated analog outputs
  • Indigo520: two probes, four isolated outputs and two relays
  • Ethernet web interface and Modbus TCP communication
  • Rugged IP66 and NEMA 4 metal enclosure
Vaisala Transmitter Indigo300

Vaisala Indigo300 Industrial Transmitter

The Vaisala Indigo300 is a rugged industrial transmitter for one Vaisala Indigo-compatible smart probe, providing local measurement display and up to three configurable analog outputs.

Its corrosion-resistant IP66 metal enclosure, flexible probe mounting and interchangeable probe design make Indigo300 suitable for humidity, temperature, dew point, CO2, moisture in oil and other demanding industrial measurements.

Vaisala MMT310 Moisture and Temperature Transmitter for Oil

Vaisala MMT310 Moisture and Temperature Transmitter for Oil

Vaisala HUMICAP® MMT310 Series provides continuous online measurement of moisture and temperature in transformer, lubrication and hydraulic oils.

The compact transmitter measures water activity (aw) or relative saturation (%RS), showing how close the oil is to forming free water. Optional ppm calculation is available for mineral transformer oil and configured oil types.

  • Models MMT317 and MMT318
  • Water activity range: 0 to 1 aw
  • Temperature range: -40 to +180°C
  • Two configurable analogue outputs and RS-232C
  • Up to 40 bar with MMT318 and ball-valve installation
  • IP66 compact transmitter enclosure
  • Traceable calibration certificates included
Vaisala MMT330 Moisture in Oil Transmitter Series – Discontinued

Vaisala MMT330 Moisture in Oil Transmitter Series – Discontinued

Vaisala MMT330 Moisture in Oil Transmitter Series – Discontinued

The Vaisala MMT330 Series provided continuous measurement of moisture and temperature in transformer oil, lubrication oil, hydraulic fluid and other liquid hydrocarbons.

  • Discontinued series; not recommended for new installations
  • Legacy MMT332, MMT337 and MMT338 probe configurations
  • Measures water activity, relative saturation, temperature and calculated ppm
  • Graphical display, data logging and versatile analogue or digital outputs
  • Used for oil-condition monitoring, dryer control and free-water risk detection
  • Use Vaisala MMP8 with an Indigo transmitter for new installations
back to top