Vaisala DMT143L Miniature Dewpoint Transmitter for OEM Applications


Key Features:

  • Miniature size dew point transmitter for e.g. small industrial dryer applications
  • Vaisala DRYCAP technology with auto-calibration
  • Long calibration interval saves maintenance costs
  • Dew point measurement range -60 … +60 °C (-76 … +140 °F)
  • Accuracy ±2 ºC (±3.6 ºF)
  • Withstands condensation
  • Fast response time 
  • Compatible with Vaisala DRYCAP Hand-Held Dewpoint Meter DM70
  • Traceable calibration (certificate included)
  • Easy servicing and data transfer via the RS485 user interface
  • LED alarm for exceeded dew point level
Product Options:

Maximum 25 characters

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Crafted for the most demanding conditions, Vaisala has introduced their DMT143L Miniature Dewpoint Transmitter. The DMT143L delivers dependable, stable measurements, making it ideal for industrial dryer applications.

The transmitter encompasses both the Vaisala DRYCAP thin film polymer sensor and auto-calibration software. The DRYCAL 180M sensor is suited for dry gasses and desiccant dryers, while more humid applications, like refrigeration dryers, benefit from the DRYCAP 180S sensor. Each sensor is protected against particulate pollution, water condensation, oil vapor and most chemicals. Able to withstand condensation, the sensor is perfect for low dew point applications where process water spikes, like pipeline condensation during a system failure or start-up, are present.

The DMT143L’s auto-calibration software operates on-line as the process is running. When measurement accuracies are not verified, corrections are made instantaneously. The  DMT143L quickly modifies the measurement, amends dry-end drifts and continues to function for utmost productivity.

Measurement range(typical) -60 ... +60 °C (-76 ... +140 °F)
Different analog output scalings available
(when the dew point is below 0 °C (32 °F),
the transmitter outputs frost point)
Accuracy with DRYCAP® 180M

±2 °C (±3.6 °F)
Response time 63 % [90 %] at +20 °C gas temperature
Flow rate >1 l/min and 1 bar pressure  
    -60 -> -20 °C Td (-76 -> -4 °F Td)
    -20 -> -60 °C Td (-4 -> -76 °F Td)
5 s [10 s]
45 s [10 min]
Accuracy with DRYCAP® 180S ±2 °C (±3.6 °F)
Operating Environment
Temperature 0 ... +60 °C (32 ... +140 °F)
    higher temperature peaks Short-term OK
Relative humidity 0 ... 100 %RH
Pressure 0 ... 20 bara (0 ... 290 psia)
Sample flow rate no effect
Analog output
Resolution for analog output
Typical temperature dependence
Serial line for service use
4 ...20 mA
±0.002 mA
0.0008 mA/ °C
Sensor DRYCAP®
Optimal sensor for refrigeration dryers
Operating voltage
Power consumption at 24 VDC
External load for analog output
Probe material (wetted parts)

Sensor protection

Mechanical connection

Electronics housing material
Housing classification
Storage temperature range
18 - 28 VDC
max. 220 mA
max. 500 Ω
stainless steel
(AISI 316L)
stainless steel
sintered filter (HM47280)
G½” ISO228-1 thread with
bonded seal ring (U-seal)
stainless steel
-40 ... +60 °C, (-40 ... +140 °F)
Complies with the EMC standard EN61326-1, Electrical equipment for measurement, control and laboratory use - EMC requirements; Industrial environment.
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