Vaisala DMT143 Datasheet
DMT143 Dew Point Transmitter
For OEM applications
Features
• Vaisala DRYCAPâ technology with
a unique autocalibration function
• Calibration interval of 2 years
• Dew point measurement range
−70 ... +60 °C (−94 ... +140 °F)
• Accuracy ±2 °C (±3.6 °F)
• Withstands condensation
• Compatible with Vaisala
DRYCAPâ Handheld Dew Point
Meter DM70
• Compatible with Vaisala Insight
PC software
• Traceable calibration
• Voltage (V) or current (mA)
analog output
• RS-485 digital output with
Modbusâ RTU support
• LED alarm for exceeded dew
point level
• Fast response time
Due to its wide measurement range and excellent long-term stability, Vaisala
DRYCAPâ Dew Point Transmitter DMT143 is an ideal choice for small compressed air
dryers, plastic dryers, and other OEM applications.
Vaisala DRYCAPâ technology
Vaisala DRYCAPâ Dew Point Transmitter
DMT143 is a miniature dew point
measurement instrument.
The transmitter can be installed directly
into pressurized systems at 50 bar
(725 psia) maximum pressure. The longterm high performance is achieved with
Vaisala DRYCAPâ technology.
The sensor fully withstands getting wet,
and therefore, the transmitter performs
exceptionally well in applications that
occasionally experience process water
spikes, such as pipeline condensation
during a system failure or start-up.
The sensor is also highly resistant to
particulate contamination, oil vapor, and
most chemicals, and is insensitive to
the flow rate.
Long calibration interval
The calibration interval of DMT143 is
2 years. Additionally, Vaisala DRYCAP
Handheld Dew Point Meter DM70 can be
used to confirm the performance of
DMT143 without disconnecting
the transmitter. For any adjustment
needs, the transmitter can be sent to
Vaisala Service.
The unique autocalibration function,
developed by Vaisala, detects possible
measurement inaccuracies and
automatically corrects dry-end drift in
the calibration curve. This ensures
accurate measurements and long
calibration intervals.
â
Easy installation
DMT143 has a variety of features to
choose from, including dierent output
and installation options, and alarm LED.
Due to its small size and light weight,
DMT143 is quickly and easily installed in
tight spaces or in small-size pipelines.
The alarm LED indicates too high dew
point in the process. The trigger point is
preset at the factory. It can be later
adjusted with Vaisala DRYCAP
Handheld Dew Point Meter DM70, or the
convenient Vaisala Insight PC software
for Windowsâ. Insight PC software can
also be used for other configuration
options (see www.vaisala.com/insight).
â
Technical data
0 20
20
0
10
30
-10
-20
-30
10 30 40 50 60
40
Dew point temperature (°C)
Temperature of measured gas (°C)
-40 -30 -20 -10
-40
-50
-60
-70
50
60
-80
-90
Accuracy
±3 °C Td*
Not recommended for
continuous measurement
Accuracy
±2 °C Td
Water vapor saturation line
* > 12 bar, accuracy ±4 °C Td
Measurement performance
Sensor
Sensor protection Stainless steel sintered filter
Recommended calibration interval to
confirm the specified accuracy
Dew point temperature
Measurement range (typical) −70 … +60 °C (−94 … +140 °F) T
Accuracy in air or N2
Analog output scalings:
Option 1 −80 … +20 °C (−112 … +68 °F) T
Option 2 −80 … +20 °C (−112 … +68 °F) T
Option 3 Free scaling
Response time 63 % [90 %]:
−70 → −20 °C Td (−94 → −4 °F Td) 5 s [15 s] (typical)
−20 → −70 °C Td (−4 → −94 °F Td) 45 s [10 min] (typical)
Water concentration by volume (ppm)
Measurement range (typical) 10 … 40 000 ppm
Accuracy at +20 °C (+68 °F), 1 bar 1 ppm + 20 % of reading
1) When the dew point is below 0 °C (32 °F), the transmitter outputs frost point.
2) At +20 °C gas temperature and 1 bar pressure and 1 liter/min flow rate.
Operating environment
Measurement environment For air, nitrogen, hydrogen, argon,
Temperature
Relative humidity 0 … 100 % RH
Pressure
Sample flow rate No eect for measurement accuracy
Storage temperature −40 … +60 °C (−40 … +140 °F)
1) Consult Vaisala if other chemicals are present. Consider safety regulations with flammable gases.
2) For extended temperature below 0 °C (+32 °F) or pressure above 20 bara (290 psia) the supply
voltage must be 24 … 28 VDC.
1)
2)
2)
2)
DRYCAPâ 180D
2 years
d
±2 °C (±3.6 °F) Td (see graph below)
d
dew point at ambient pressure
helium, and oxygen
1)
d
−40 … +60 °C (−40 … +140 °F)
0 … 50 bara (725 psia)
Inputs and outputs
Analog output (scalable) 4 … 20 mA (3-wire), 0 … 1 V / 5 V,
Resolution for current output 0.002 mA
Resolution for voltage output 0.3 mV
Accuracy for current output at +20 °C ±0.05 mA
Accuracy for voltage output at +20 °C ±0.01 V
Operating voltage with digital output 12 … 28 VDC
Operating voltage with voltage output 12 … 28 VDC
Operating voltage with current output 18 … 28 VDC
Load for current output Max. 500 Ω
Load for voltage output Min. 10 kΩ
Typical temperature dependence 0.005 % of span/°C
Digital output RS-485, non-isolated
Supported protocols Vaisala industrial protocol
Connector 4-pin M8 (IEC 60947-5-2)
Supply current at +20 °C (Uin 24 VDC)
Normal measurement 10 mA + load current (typical)
During self-diagnostics 220 mA pulsed (typical)
1 … 5 V
Modbus RTU
Mechanical specifications
Mechanical connection ISO 228-1 G1/2"
Housing material Stainless steel (AISI316L)
Weight:
G thread and UNF thread versions 90 g (3.2 oz)
NPT thread version 100 g (3.5 oz)
1/2" NPT
3/4"-16 UNF
5/8"-18 UNF
Compliance
IP rating IP66
EMC compliance EN 61326-1, industrial electromagnetic
environment
Spare parts and accessories
Connection cable for DM70 219980SP
USB cable for PC connection
1)
Loop powered external display 226476
Loop powered external display with
relays
Sampling cells
Basic sampling cell DMT242SC
With Swagelok 1/4" male connectors DMT242SC2
With quick connector and leak screw DSC74SP
Two-pressure sampling cell DSC74BSP
Cooling/venting coil DMCOILSP
See the DSS70A product page at www.vaisala.com for further information
about the sampling cells available for DM70.
1) Vaisala Insight software for Windows is available at www.vaisala.com/insight.
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