Dew Point Transmitter

Dew point Transmitter

Vasthi Instruments' Dew Point Transmitter is the ideal measurement device for continuous dew point measurement. It has a precise dew point estimation down to -60°C Td (-76°F Td).

The Dew Point Transmitter utilizes microprocessor-based circuitry to convert sensor signals using psychometric equations. The device is assembled in a rugged handheld IP-65 body with quick-disconnect tubing couplings.

The device also has an internal sensor manifold for accurate dew point measurement and uses an RS485 interface (Modbus RTU). The device is equipped with a dedicated input to maintain line pressure.

The powerful metal encasing (Aluminum or Treated steel) ensures extreme durability of the device.




  • Analog output 4-20 mA for dew point
  • Condensation insensitive
  • Fast adjustment time
  • Pressure resistant up to 350 bar(special version)
  • RS485 RTU interface
  • The higher resolution of the sensor signal history graphical data
  • Sensor diagnosis is on-site with a mobile device.
  • Readable via Modbus:
  • Pressure dew point [°Ctd.]
  • Temperature [° C]
  • Rel. humidity [% RH]
  • Moisture content V / V [ppmV / V]


Model No V smart Tdx Series
Sensor technology Capacitive Thin Film Polymer
Measuring Ranges (-40 to +30), (-60 to +30),( -80 to +30) & (-100 to +30)
Monitoring Parameter Dew Point, RH, Temperature & Moisture
Resolution 0.1 % Deg. C
Accuracy +/- 2 FS
Linearity +/- 1 %
Display Optional
Operating power 18- 24 DC
Analog Output 4-20 mA
Digital Output RS 485/USB
Display Local LED Display
Q. Can we fit the transmitter directly into the pipeline?

A. Yes, you can.


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