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Vaisala DPT146 Dew Point & Pressure Transmitter

Vaisala DPT146 is a combined dew point and pressure transmitter.  Designed specifically with compressed air applications in mind, the Vaisala DPT146 is a simple, combined measurement instrument, reducing installation costs.  Additionally, on going maintenance is simplified as calibration can be spot checked against a Vaisala DM70 Portable Dewpoint Meter.  The DM70 can also be used as a local display and data logger.  In addition to dewpoint and pressure, temperature measurement is available via RS-485 communications.


Vaisala DPT146 Dew Point & Pressure Transmitter

  • Combined dew point and temperature measurement
  • Highly accurate RH information thanks to dew point data coupled with live pressure input
  • Compatible with the Vaisala Hand-Held DM70 for spot-checking, local display and data logging
  • Pressure range: 1 … 12 barA
  • Dew point range: -70 … +30 °C (accuracy within ±2°C)
  • Temperature range (via RS-485 is selected) -40…+80°C (accuracy within ±0.5°C at room ambient)
  • Supply and signal connection via M8 4-pin circular plug (cable assemblies available from Fluidic)
  • 24Vdc supply with 2x analogue output channels (typically dew point and pressure)
  • Analogue outputs can be mA (usually 4-20mA) or 0-5v / 0-10v
  • Compact design, full length including sensor probe approx 120-130mm x 33mm DIA
  • 316SS construction with various threaded process connection options
  • Operating environment -40…+60°C, 0-100% RH (storage up to +80C), IP66 design



Vaisala DPT146 Dew Point & Temperature Transmitter Sample Cell Options

Vaisala DSC74B Two Pressure Sample Cell

Vaisala DSC74B limits the flow rate with a fixed leak screw. The flow is optimized for pressures 3….10 barg. The fixed leak screw eliminates the risk of opening the leak screw fully by accident and this way emptying a gas vessel. The maximum flow can be increased, if needed, by removing the leak screw and adjusting the flow manually with the valve. Harmful gases can be recovered by connecting a collection system at the outlet (not available from Vaisala). In the basic operation of the DSC74B, the gas flows to the sensor from the front and the outlet is on the side. To have the measurement done at atmospheric pressure, the inlet and outlet are reversed. Then the reducing parts (G3/8″ -G1/2″ or G3/8″ – G1/4″) on the outlet side help to protect the sensor from ambient humidity coming in.

Vaisala DSC74 Sample Cell with quick connectors

Vaisala DSC74 has been designed especially for compressed air lines. The sampling cell contains an adjustable leak screw that allows keeping up the pipeline pressure at the sensor. The leak screw should be 1/2 turn open. This can be verified by first closing the leak screw, then turning 1/2 turn to open it. Then the air coming out will make a hardly audible little fizz and it can be lightly felt when putting a hand in front of the air stream. The DSC74 comes with a quick connector that fits to the industry standard compressed air line connectors. This allows for easy installation and detachment of the dewpoint transmitter without having to shut down the process.

Vaisala DMT242SC Sample Cell with female connectors

Vaisala DMT242SC is a basic sample cell with only the main sampling cell body. The inlet and outlet are female threaded sample connectors (inlet G3/8″, outlet G1/4″ ISO). The DMT242SC is suitable for users requiring only a sampling cell to fit the probe into and doing further assembly (piping into inlet & outlet, valves, possible flow meter) by themselves.

Vaisala DMT242SC2 Sample Cell with swagelok connectors

The DMT242SC2 sampling cell is easy to connect thanks to welded swagelok connectors at both the inlet and outlet that fit directly to 1/4″ tubing. The DMT242SC2 is the suitable choice in e.g. plastics drying systems, where the measurement is made by tapping off the dryer system and bringing a small air stream to the sensor. The swagelok connectors of DMT242SC2 easily connect to a cooling coil or tubing providing the essential function of cooling the dry air to ambient temperature before it reaches the sensor.


Note that Fluidic also offer a number of spares and accessories for the Vaisala DMT146.  This includes signal and supply cable assemblies, displays and USB configuration cables for use with Vaisala Putty and equivalent software.  Fluidic are a recognised partner of Vaisala CEN (Industrial division) for Scotland and the North of England.  Our instrumentation engineers are product trained and able to help with instrument selection within the full range of Vaisala Dewpoint instrumentation.  Please call either office for more information (Glasgow 0141 641 5920,  Warrington 01925 572401).


  • Download Vaisala DPT146 Datasheet
  • Download Vaisala DPT146 User Guide
  • Download Compressed Air Dew Point Sampling Technical Note
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