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CS Instruments FA 510 / FA 515 Dew Point Sensor

  • Precise, long-term stability
  • Condensation insensitive
  • Quick response time

The FA 510/515 series of dew point sensors from CS Instruments have been designed for accurate measurement of residual moisture measurement in compressed air and gases. The dew point can be measured in the compressed air after the adsorption drier, membrane dryer or refrigeration dryer.

The FA 510 / 515 series can measure the residual moisture or dew point on other process gases such as oxygen, nitrogen or argon.

The dew point sensor is available as either a 3-wire device (FA 510) or a 2-wire device (FA 515) with both devices featuring a 4 – 20 mA analogue output and optional Modbus-RTU (RS 485).

The latest sensor technology offers extremely stable readings and features a condensation resistant design. The operating temperature range for sensors designed for use in adsorption dryers is -80 °c to + 20 °c with the refrigeration dryer model offering a working temperature range of -20 °c to + 50 °c.

Output data

All devices offer a 4 – 20 mA output for the dew point across the above temperature range, devices with Modbus-RTU also offer additional data via the digital interface which includes:

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

Key specifications

Measuring ranges-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 500 bar
Power supply24 VDC (10…36 VDC)
Protection classIP66
EMCIn acc. with DIN EN 61326-1
Operating temperature-20…70 °C
ConnectionM12, 5-pin
PC connectionModbus-RTU interface (RS 485)
Analogue Output4…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 outputs< 500 Ω
Screw-in threadG 1/2″ Stainless steel
Optional: UNF 5/8", NPT 1/2"
DimensionsØ 30 mm, length approx. 130 mm
Via service software:
Choose units% RH, °Ctd, g/m³, mg/m³, ppm V/V
Scaling4…20 mA change


Common process applications and industrial uses include:

Residual moisture/dew point measurement after granulate dryers in the plastics industry

Other features

  • Mounts with a standard measuring chamber for compressed air up to 16 bar, offering easy installation via a quick coupling
  • Special versions available for pressures up to 350 or 500 bar
  • Stainless steel bypass measuring chamber for dew point measurementin gases under pressure
  • Optional precision calibration at -40 °Ctd or 3 °Ctd incl. ISO certificate
  • 1/2" BSPP Stainless steel process connection with optional UNF 5/8" or NPT 1/2"

Model numbers

  • 0699 0510
  • 0699 0512
  • 0699 0515
  • 0699 0517


The CS Instruments FA 510 / FA 515 Dew Point Sensor is widely used in the following industries:

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