Vaisala MMP8 Moisture In Oil Probe

Features

  • Modbus RTU over RS-485
  • Compatible with Indigo series transmitters and Insight PC software
  • 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 HUMICAP sensor, used for over 20 years in oil applications
  • Traceable calibration certificate: 6 points for humidity, 1 point for temperature

 

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Dpstar is a leading supplier of environmental measurement sensors for temperature, relative humidity, pressure, dew point, CO2, and other environmental condition monitoring for industrial process application and research. Since the ’90s, we earned a reputation as a trusted partner to our clients through our commitment and dedication. We are an authorized distributor and supplier of measuring sensors solutions from renowned manufacturers Vaisala. Vaisala is a global leader in environmental and industrial measurement. Building on 80 years of experience, Vaisala provides observations for a better world. Vaisala is a reliable partner for customers around the world, offering a comprehensive range of innovative observation and measurement products and services.

Vaisala MMP8 features the latest Vaisala HUMICAP 180L2 sensor, built on 20 years of field experience. Specifically designed for measuring moisture in transformer and lubrication oils, this sensor offers accurate results across a wide range. The HUMICAP 180L2 sensor has excellent sensitivity in the dry end of the range, which is typically needed in transformer applications. The MMP8 probe ensures fast and reliable moisture measurement in oil, utilizing the reliable Vaisala HUMICAP sensor developed for various liquid applications.

Vaisala MMP8 measures dissolved moisture in oil, showing it as water activity (aw), relative saturation (%RS), and temperature (T). Water activity or relative saturation directly indicate if there’s a risk of free water forming, important in lubrication oil to detect water and prevent free water buildup. This measurement works regardless of oil type or age.

Dimension

Key Benefits

Robust & Reliable Out Of The Box
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.

Easy Installation
Vaisala 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″.

Measure The Margin To Water Saturation
Water activity or relative saturation directly indicate whether there is a risk of free-water formation.

Superb Connectivity
Vaisala MMP8’s smart measurement and digital Modbus RTU over RS-485 connection within the probe fully support standalone use. Vaisala MMP8 offers a robust display for data visualization, easy access to probe configuration, and more extensive options for connectivity, supply voltage and wiring. Whether using Vaisala MMP8 on its own or with an Indigo transmitter, the Vaisala Insight software offers easy field calibration, probe configuration, and device analytics.

Specification

Measurement Performance
Water Activity
Measurement range 0 … 1 aw
T90 response time 1) 10 min
Sensor HUMICAPâ 180L2
Accuracy 2) ±0.01 aw (±1 %RS)
Temperature
Measurement range (−40 … +180 °C) (−40 … +356 °F)
Accuracy at +20 °C (+68 °F) ±0.2 °C (0.36 °F)
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.
Operating Environment
Operating temperature of probe head (−40 … +180 °C) (−40 … +356 °F)
Operating temperature of probe body (−40 … +80 °C) (−40 … +176 °F)
Storage temperature range (−40 … +80 °C) (−40 … +176 °F)
Operating pressure range 0 … 40 bar (0 … 580 psia)
Installation pressure Up to 10 bar (145 psia)
IP rating of probe body IP66
Ball valve
Operating temperature Up to +120 °C (+248 °F)
Operating pressure Up to 40 bar (0 … 580 psia)
Inputs and Outputs
Operating voltage 15 … 30 V DC
Current consumption 10 mA typical
Digital output RS-485, non-isolated
Protocols Modbus RTU
Output parameters Relative saturation (%RS)
Temperature (°C)
Water activity
Water mass fraction (ppmw)
Compliance
EU directives EMC Directive (2014/30/EU)
RoHS Directive (2011/65/EU)
EMC compatibility EN 61326‑1, industrial environment
Type approvals DNV GL certificate no. TAA00002YT
Compliance marks CE, China RoHS, RCM, WEEE
Mechanical Specifications
Connector M12 5-pin A-coded male
Weight 510 g (18.0 oz)
Filter options Stainless steel grid standard filter
Stainless steel grid filter for high flow
rates (> 1 m/s)
Probe cable length 2 m (6.56 ft)
Adjustable installation depth 35 … 179 mm (1.37 … 7.05 in)
Materials
Probe AISI 316L
Probe body AISI 316L
Cable jacket FEP
Accessories
Ball valve ISO 1/2″ with welding joint BALLVALVE-1
Ball valve ISO 1/2″ – ISO 3/4″ with thread joint BALLVALVE-2
Indigo USB adapter 1) USB2

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