CS Instruments FA 510/515 - Dew Point Sensor For Adsorption Dryers

In addition to the previously common 4…20 mA analogue output the new generation of dew point sensors have a digital RS 485 interface (Modbus-RTU).


In addition to the previously common 4…20 mA analogue output the new generation of dew point sensors have a digital RS 485 interface (Modbus-RTU). All values like e. g. dew point, temperature, absolute humidity … which are measured and calculated by the dew point sensor can be retrieved via the Modbus protocol.

Compared with the previous models the sensorics and evaluation electronics have been improved once again, especially the integrated temperature compensation. This means: Increased accuracy at different ambient temperatures and an improved resolution of the sensor signal. Like the previous models the new dew point sensors have an excellent long-term stability and show reliable measured values. The sensor element is insensitive against condensation and due to the serial sintered cap made of stainless steel it is protected against direct contact with soiled particles.


CS Instruments

CS Instruments

CS Instruments GmbH & Co. KG with locations in 24955 Harrislee and 78052 Villingen-Schwenningen/ Tannheim, is managed by Dipl. Eng. (FH) Wolfgang Blessing as sole Managing Director.

CS Instruments GmbH was established in the year 2002 by Christian Schuldt and Wolfgang Blessing as equal shareholders/Managing Directors.

Wolfgang Blessing already was sound a specialist on the sector of compressed air technology resp. industrial measurement technology long before the establishment of CS Instruments GmbH in the year 2002. Prior to the foundation of CS Instruments GmbH Dipl. Ing. (FH) Wolfgang Blessing acted for more than 10 years as primarily responsible product manager for industrial measurement technology at a worldwide known manufacturer of measuring instruments for compressed air and gases in the Black Forest. The technical knowledge and experience matched with the long-term practical knowledge was the corner stone for the success of CS Instruments.


  • Measuring range -80…20°Ctd
  • Analogue output 4…20 mA
  • Precise, long-term stability
  • Condensation insensitive
  • Quick response time
  • Pressure-tight up to 350 bar (special version
  • NEW: Modbus-RTU interface
  • NEW: Higher resolution of the sensor signal due to improved evaluation electronics
  • Sensor diagnosis on site by means of hand-held instrument or CS Service Software


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


  • Measuring range: -80…20 °Ctd, -20…50 °Ctd
  • Accuracy: ± 1 °C at 50…-20 °Ctd
    ± 2 °C at -20…-50 °Ctd
    ± 3 °C at -50…-80 °Ctd
  • Pressure range: -1…50 bar
    Special version up to 350 bar
  • Power supply: 24 VDC (10…36 VDC)
  • Protection class: IP 65
  • EMC: In acc. with DIN EN 61326-1
  • Operating temperature:
    -20…70 °C
  • Connection: M12, 5-pin
  • PC connection: Modbus-RTU interface (RS
  • Analogue output: 4…20 mA = -80…20 °Ctd
    4…20 mA = -20…50 °Ctd
    FA 510: 4…20 mA (3-wire)
    FA 515: 4…20 mA (2-wire)
  • Burden for analogue
    < 500 Ω
  • Screw-in thread: G 1/2″
    Optional: UNF 5/8″, NPT 1/2″
  • Dimensions: Ø 30 mm, length approx.
    130 mm
  • Via service software:
  • Choose units
  • Scaling
    % RH, °Ctd, g/m³, mg/m³,
    ppm V/V
    4…20 mA change

Additional Informations

  • Standard measuring chamber
    • for compressed air up to 16 bar
  • Control and calibration set for dew point sensors

    is screwed onto the dew point sensor and therefore enables an easy and low-priced possibility for on-site control and calibration down to -20°Ctd.

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