Vaisala MMT310 Technical data
www.vaisala.com
MMT310 Series Moisture and Temperature
Transmitter for Oil
Water content as
ppm calculation for
transformer oils
PPM units are traditionally used
in transformer applications.
They indicate the average mass
concentration of water in oil. The
ppm calculation for mineral oil based
transformer oil is optional in the
MMT310 series.
Diverse applications and
demanding conditions
The MMT310 series can be used in
lubrication and hydraulic systems
as well as in transformers. It can be
used for on-line moisture monitoring
and as a control function, allowing
separators and oil puriers to be
Two probe options: MMT317 and MMT318
Features/Benefits
Continuous measurement of
▪
moisture in oil
Proven Vaisala HUMICAP®
▪
sensor, 10 years in oil
applications
Measurements in lubrication,
▪
hydraulic and transformer oils
Excellent pressure and
▪
temperature tolerance
Measuring water activity - ppm
▪
calculation for transformer oil
Small size, easy to integrate
▪
NIST traceable calibration
▪
Applications: e.g. monitoring
▪
of transformer oil and of
lubrication systems in marine
and paper industry
The Vaisala HUMICAP® Moisture and
Temperature Transmitter Series for
Oil MMT310 is a fast and reliable online detector for moisture in oil.
Reliable Vaisala
HUMICAP® technology
The MMT310 series incorporates
the latest generation of the Vaisala
HUMICAP
demanding moisture measurement
in liquid hydrocarbons. The sensor’s
excellent chemical tolerance provides
accurate and reliable measurement
over the wide measurement range.
®
Sensor, developed for
Measuring water activity
The MMT310 series measures
moisture in oil in terms of the water
activity (aw) and temperature (T).
Water activity directly indicates if
there is a risk of free water formation.
The measurement is independent of
oil type, age, and temperature.
started only when necessary.
Installation options
The MMT318 has two adjustable
probe lengths. The transmitter can
be ordered with a ball valve set that
enables the insertion and removal of
the moisture probe for calibration,
without the need to empty the oil
system.
The MMT317 has a small pressuretight probe with optional Swagelok
ttings.
Several outputs, one
connector
The MMT310 series has two analog
outputs and an RS-232 serial output.
The output signals and the supply
power travel in the same cable, the
only cable connected to the unit.
Technical data
Measured values
WATER ACTIVITY
Measurement range a
w
0 ... 1
Accuracy (including non-linearity,
hysteresis and repeatability)
0 ... 0.9 ±0.02
0.9 ... 1.0 ±0.03
Response time (90 %) at +20 ˚C in still oil
10 min
(with stainless steel filter)
Sensor Vaisala HUMICAP
TEMPERATURE
Measurement range -40 ... +180 ˚C (-40 ... +356 ˚F)
Typical accuracy at +20 ˚C ±0.1 ˚C (±0.18 ˚F)
Typical temperature dependence
of electronics ±0.05˚C/ ˚C (±0.005 ˚F/˚F)
Sensor Pt100 IEC751/3 class B
Electrical connections
Two analog outputs, selectable and
scalable 0 ... 20 mA or 4 ... 20 mA
Typical accuracy of analog output at +20 ˚C ±0.05 % full scale
Typical temperature dependence
of analog output
Serial output RS-232C
Connections 8-pole connector with RS-232C, current
Operating voltage U
Minimum operating voltage U
in
in
with RS-232C 10 VDC
0 ... 20 mA, 4 ... 20 mA 11 VDC + (R
I
out
Power consumption at +20 ˚C, U
= 24 VDC
in
with RS-232C 20 mA
2 x 0 ... 20 mA 60 mA
I
out
0.005 %/˚C (0.003 %/˚F)
full scale
outputs (two channels) and U
24 VDC (10 ... 35 VDC)
/60) VDC
load
General
Operating temperature range for
electronics -40 ... +60 ˚C (-40 ... +140 ˚F)
Storage temperature -55 ... +80 ˚C (-67 ... +176 ˚F)
Pressure range for MMT318 with ball
valve up to 120 ˚C 0 ... 40 bar
Pressure range for MMT317 0 ... 10 bar
External load R
Material
®
in
transmitter housing G-AlSi 10 Mg
transmitter base ABS/PC
Housing classification IP65
to be protected from direct rain
Cable feed through alternatives 8-pole connector with 5 m cable,
female 8-pin connector screw
joint for cable diameter 4 ... 8 mm
Sensor protection stainless steel grid
Probe cable length
MMT317 0.5, 2, 5 or 10 meters
MMT318 2, 5 or 10 meters
Probe installation MMT317
Swagelok
®
NPT 1/2”, ISO 3/8” or ISO 1/2”
Probe installation MMT318
Fitting bodies ISO 1/2”, NPT 1/2”
Ball Valve Set BALLVALVE-1
Complies with EMC standard EN61326-1, Industrial environment
Note: When using the current output, the RF field susceptibility
level according to standard EN61000-4-3 with a frequency band
of 110 ... 165 MHz, is only 3 V/m (generic environment) with the
specified accuracy.
®
HUMICAP
is a registered trademark of Vaisala.
<500 Ohm
1
For more information, visit
www.vaisala.com or contact
us at sales@vaisala.com
Ref. B210831EN-A ©Vaisala 2009
This material is subject to copyright protection, with all
copyrights retained by Vaisala and its individual partners. All
rights reserved. Any logos and/or product names are trademarks
of Vaisala or its individual partners. The reproduction, transfer,
distribution or storage of information contained in this brochure
in any form without the prior written consent of Vaisala is strictly
prohibited. All specifications — technical included — are subject
to change without notice.
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