Vaisala MMP8 Datasheet
MMP8 Moisture in Oil Probe
Features
• Continuous online measurement of moisture in oil and temperature
• Temperature measurement range −40 … +180 °C (−40 … +356 °F)
• Measurement accuracy up to ±0.01 aw (±1 %RS)
• Incorporates the proven Vaisala HUMICAPâ sensor, used for over 20 years in oil applications
• Modbusâ RTU over RS-485
• Traceable calibration certificate: 6 points for humidity, 1 point for temperature
• Compatible with Indigo series transmitters and Insight PC software
Vaisala HUMICAPâ Moisture in Oil Probe MMP8 enables fast and reliable measurement of moisture in oil. It uses the proven Vaisala HUMICAPâ sensor, which was developed for demanding dissolved moisture measurements in transformer and lubrication oils, hydraulic fluids, and other liquids.
Reliable Vaisala HUMICAPâ technology
MMP8 incorporates the latest-generation Vaisala HUMICAPâ 180L2 sensor, which is the result of over 20 years of field experience. It was developed for demanding moisture measurement in transformer and lubrication oils and other liquids.
The sensor's excellent chemical tolerance provides accurate and reliable measurement over a wide measurement range. The HUMICAPâ 180L2 sensor has excellent sensitivity in the dry end of the range, which is typically needed in transformer applications.
Measure the margin to water saturation
MMP8 measures dissolved moisture in oil in terms of the water activity (aw), 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.
For other oils, the oil-specific conversion coefficients can be calculated if the water solubility of the oil is known and the solubility characteristic remains constant.
Easy installation
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.
DNV GL type approval certificate no. TAA00002YT
Technical data
Measurement performance
Water activity |
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Measurement range |
0 … 1 aw |
T90 response time 1) |
10 min |
Sensor |
HUMICAPâ 180L2 |
Accuracy 2) |
±0.01 aw (±1 %RS) |
Temperature |
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Measurement range |
−40 … +180 °C (−40 … +356 °F) |
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Accuracy at +20 °C (+68 °F) |
±0.2 °C (0.36 °F) |
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1)At +20 °C (+68 °F) in still oil.
2)In range 0 … 0.5 aw, including non-linearity, hysteresis, and repeatability. See accuracy graph below.
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±0.04 |
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±0.03 |
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±0.02 |
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T = −40 … 0 °C, +80 ... +180 °C |
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±0.01 |
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T = 0 … +80 °C |
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0 |
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0 |
0.1 |
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0.5 |
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0.8 |
0.9 |
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aw reference
MMP8 Aw measurement accuracy
Compliance
EU directives |
EMC Directive (2014/30/EU) |
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RoHS Directive (2011/65/EU) |
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EMC compatibility |
EN 61326 1, industrial environment |
Type approvals |
DNV GL certificate no. TAA00002YT |
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Compliance marks |
CE, China RoHS, RCM, WEEE |
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Mechanical specifications
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Connector |
M12 5-pin A-coded male |
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Weight |
510 g (18.0 oz) |
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Filter options |
Stainless steel grid standard filter |
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Stainless steel grid filter for high flow |
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rates (> 1 m/s) |
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Probe cable length |
2 m (6.56 ft) |
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Adjustable installation depth |
35 … 179 mm (1.37 … 7.05 in) |
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Materials |
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Probe |
AISI 316L |
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1.0 |
Probe body |
AISI 316L |
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Cable jacket |
FEP |
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136 [5.35] |
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<![if ! IE]> <![endif]>5Ø [0.2] |
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[in] |
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mm |
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Operating environment
Operating temperature of probe head |
−40 … +180 °C (−40 … +356 °F) |
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Operating temperature of probe body |
−40 … +80 |
°C (−40 … +176 °F) |
Storage temperature range |
−40 … +80 |
°C (−40 … +176 °F) |
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Operating pressure range |
0 … 40 bar (0 … 580 psia) |
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Installation pressure |
Up to 10 bar (145 psia) |
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IP rating of probe body |
IP66 |
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Ball valve |
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Operating temperature |
Up to +120 |
°C (+248 °F) |
Operating pressure |
Up to 40 bar (0 … 580 psia) |
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M12/5 |
<![if ! IE]> <![endif]>Ø 25 [0.98] |
MMP8 dimensions
Probe cable 2 m [6.56 ft]
262[10.32] 224 [8.82]
35 ... 179 [1.37 ... 7.05]
Fitting body
ISO1/2” or NPT1/2”
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35 [1.37] |
| <![if ! IE]> <![endif]>Ø 13.5 [0.53] |
<![if ! IE]> <![endif]>Ø 12 [0.47] |
Inputs and outputs
Operating voltage |
15 … 30 V DC |
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Current consumption |
10 mA typical |
Digital output |
RS-485, non-isolated |
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Protocols |
Modbus RTU |
Output parameters |
Relative saturation (%RS) |
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Temperature (°C) |
Water activity
Water mass fraction (ppmw)
Accessories
Ball valve ISO 1/2" with welding joint |
BALLVALVE-1 |
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Ball valve ISO 1/2" – ISO 3/4" with |
BALLVALVE-2 |
thread joint |
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Indigo USB adapter 1) |
USB2 |
1)Vaisala Insight software for Windows available at www.vaisala.com/insight.
Published by Vaisala | B211795EN-B © Vaisala 2021
All rights reserved. Any logos and/or product names are trademarks of Vaisala or its individual partners.
www.vaisala.com Any reproduction, transfer, distribution or storage of information contained in this document is strictly prohibited. All specifications — technical included — are subject to change without notice.
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