Vaisala MMT330 Moisture & Temperature in Oil Transmitter Series

Features

  • Analog outputs, RS-232/485, LAN
  • Modbus protocol support (RTU/ TCP)
  • Continuous online measurement of moisture in oil
  • Ball-valve installation – no need to shut down the process or drain the oil
  • Proven Vaisala HUMICAP sensor, used for over 15 years in oil applications
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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.

The MMT330 series incorporates the latest-generation Vaisala HUMICAP sensor, which is the result of over 15 years of field experience. It was developed for demanding moisture measurement in liquid hydrocarbons. The sensor’s excellent chemical tolerance provides accurate and reliable measurement over a wide measurement range Vaisala HUMICAP Moisture and Temperature Transmitter Series for Oil MMT330 enables the fast and reliable detection of moisture in oil. MMT330 series transmitters can be used in online moisture monitoring and as control devices, allowing separators and oil driers to be started only when needed.

MMT330 measures 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. The measurement is independent of oil type and age. In addition to water activity, MMT330 can output ppm, the average mass concentration of water in oil. Vaisala has this conversion readily available for mineral transformer oil. For other oils, the oil-specific conversion coefficients can be programmed into the transmitter if the water solubility of the oil is known.

Key Benefits

Easy To Install & Operate
No need to shut down the process. Installation through ball valve.

Fast
Online, real-time detection of moisture in oil without sampling.

Reliable
Tells the true margin to water saturation point in all changing conditions, taking into account e.g. temperature changes and aging of oil.

Specification

Measurement Performance
Water Activity
Measurement range aw 0 … 1
Response time (90 %) at +20 °C in still oil (with stainless steel filter) 10 min
Sensor HUMICAP 180L2
Accuracy (Including Non-linearity, Hysteresis, and Repeatability):
0 … 0.9 ±0.02
0.9 … 1.0 ±0.03
Temperature
Measurement range (-40 … +180 °C) (-40 … +356 °F)
Accuracy at +20 °C (+68 °F) ±0.2 °C (0.36 °F)
Operating Environment
EMC compliance EN61326-1, Industrial environment1
Pressure range for probes See probe specifications
Operating Temperature
For probes Same as measurement ranges
For transmitter body (-40 … +60 °C) (-40 … +140 °F)
With display (0 … +60 °C) (+32 … +140 °F)
1) Note: Transmitter with display test impedance of 40 Ω is used in IEC61000-4-5 (Surge immunity)
Inputs and Outputs
Operating voltage 10 … 35 VDC, 24 VAC ±20 %
Operating voltage with optional power supply module 100 … 240 VAC 50/60 Hz
Power Consumption at 20 °C (Uin 24 VDC)
RS-232 Max. 25 mA
Uout 2 x 0 … 1 V / 0 … 5 V / 0 … 10 V Max. 25 mA
Iout 2 x 0 … 20 mA Max. 60 mA
Display and backlight (+20 mA)
Analog Outputs (2 Standard, 3rd Optional)
Current output 0 … 20 mA, 4 … 20 mA
Voltage output 0 … 1 V, 0 … 5 V, 0 … 10 V
Accuracy of analog outputs at 20 °C ±0.05 % full scale
Temperature dependence of the analog outputs ±0.005 %/°C full scale
External Loads
Current outputs RL < 500 Ω
0 … 1 V output RL > 2 kΩ
0 … 5 V and 0 … 10 V outputs RL > 10 kΩ
Max. wire size 0.5 mm2 (AWG 20) stranded wires
recommended
Digital outputs RS-232, RS-485 (optional)
Protocols ASCII commands, Modbus RTU
Service connection RS-232, USB
Relay outputs 0.5 A, 250 VAC, SPDT, potential-free
(optional)
Ethernet Interface (Optional)
Supported standards 10BASE-T, 100BASE-TX
Connector 8P8C (RJ45)
IPv4 address assignment DHCP (automatic), static
Protocols Telnet, Modbus TCP/IP
General
Display LCD with backlight, graphical trend
display of any parameter
Menu languages English, Chinese, Finnish, French,
German, Japanese, Russian, Spanish,
Swedish
Optional Data Logger with Real-time Clock
Logged parameters Max. four with trend/min./max. values
Logging interval 10 sec (fixed)
Max. logging period 4 years, 5 months
Logged points 13.7 million points per parameter
Battery lifetime Min. 5 years
Mechanical Specifications
Weight 1.0 – 3.0 kg (depends on selected
probe, cable, and modules)
Sensor protection Stainless steel grid standard filter/
Stainless steel grid filter for high flow
rates (> 1 m/s)
Cable bushing M20x1.5 for cable diameter 8 … 11 mm
(0.31 … 0.43 in)
Conduit fitting 1/2″ NPT
USB-RJ45 Serial Connection Cable
(incl. MI70 Link software)		 219685
Probe cable diameter 5.5 mm (0.2 in)
Standard probe cable lengths 2 m, 5 m or 10 m (6.6 ft, 16.4 ft,
32.8 ft)
(Additional cable lengths available,
please see order forms for details)
Housing material G-AlSi 10 Mg (DIN 1725)
Interface cable connector (optional) M12 series 8-pin (male)
Option 1 Female plug with 5 m (16.4 ft) black
cable
Option 2 Female plug with screw terminals
Compliance
IP rating IP66
IP rating with local display IP65
NEMA rating with local display 4X

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