PDP Sens Dew Point Sensors

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Extremely long-term stable

Analog output 4 - 20 mA for dew point

Condensation insensitive

Fast adjustment time

Pressure resistant up to 350 bar (special version)

Modbus RTU interface

Higher resolution of the sensor signal

Due to improved evaluation electronics

Sensor diagnosis on site

With mobile device or PMH service software

Dew point sensors PDP Sens are ideal for


  • Dew point measurement in the compressed air in context of adsorption dryer, membrane dryer, refrigeration dryer
  • Residual moisture/ dew point measurement in gases like oxygen, nitrogen, argon
  • Residual moisture/ dew point measurement after granulate dryers in the plastics industry

The PDP Sens Dew Point Sensors can be easily installed via quick coupling and we recommend mounting with standard measuring chamber for compressed air up to 16 bar. The following parameters are readable via Modbus:

  • Pressure dew point [° Ctd.]
  • Temperature [° C]
  • Rel. humidity [% RH]
  • Abs. humidity [g / m³]
  • Moisture content [g / m³]
  • Moisture content V / V [ppmV / V]
  • Partial vapor pressure [hPa]
  • Atmospheric dew point [° Ctd. atm]

Technical data PDP Sens 1 - PDP Sens 1A - PDP Sens 2 - PDP Sens 2A

Measure range

-80-20°Ctd, -20-50°Ctd



± 1°C to 50--20°Ctd

± 2°C to -20--50°Ctd

± 3°C to -50--80°Ctd

Pressure range

-1-50 bar

special version up to 350 bar

Power supply

24 VDC (16-30 VDC)

Protection class

IP 65


according to DIN EN 61326-1

Operating temp.

-20-70 °C


M12, 5-pole

PC connection

Modbus-RTU interface (RS 485)


Analog output

4-20 mA = -80-20°Ctd

4-20 mA = -20-50°Ctd

PDP Sens 1/2: 4-20 mA (3-wire) PDP Sens 2A : 4-20 mA (2-wire)

Burden for analog output

< 500 Ω

Screw-in thread

G 1/2“

optional: UNF 5/8“, NPT 1/2“


Ø 30 mm, length approx.

130 mm

Via service software Choose units



% RH, °Ctd, g/m³, mg/m³, ppm V/V

Change 4-20 mA