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CS Instruments FA 500 Dew Point Sensor

  • Local display
  • Alarm output options
  • Working temperature range from -80 to 20 °Ctd

The FA 500 from CS instruments is a dew point sensor with a working temperature range of -80 to 20 °Ctd. Devices feature a 4 – 20 mA analogue output for the dew point along with a programmable alarm relay to act as a low or high threshold alarm.

Modbus-RTU interface over 485 is also available offering additional digital process outputs.

The integrated display allows for easy programming of process parameters, alarm threshold or output scaling.

The latest sensor technology offers extremely stable readings in the long term and offers a quick adaption time.

Different versions of the FA 500 are available dependant on dew point application.

Refrigeration dryers

For refrigeration dryers the working temperature range is -20 to +50 °Ctd.

Adsorption dryers

For adsorption dryers the temperature range is available as either -80 to +20 °Ctd or -60 to +30 °Ctd.

Accuracy of the sensor is stated as ± 1 °C at +50…-20 °Ctd, ± 2 °C at -20…-50 °Ctd and ± 3 °C at -50…-80 °Ctd.

Output data

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, -60…30 °Ctd,-20…50 °Ctd, or 0…100% RH
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 classIP65
EMCIn acc. with DIN EN 61326-1
Operating temperature-20…50 °C
Connection x M12, 5-pin for analogue output, Modbus-RTU and alarm output, M-Bus (optional)Ethernet (PoE) (optional)
PC connectionModbus-RTU interface (RS 485)
Output 3-wire4…20 mA = -80…20 °Ctd
4…20 mA = -60…30 °Ctd
4…20 mA = -20…50 °Ctd
Burden for analogue outputs:< 500 Ω
Alarm relayNC, max. 60 VDC, 0.5 A
Screw-in threadG 1/2″
Dimensions housing6.5 x 85 x 75 mm (WxHxD)

Data sheets and manuals

Other features

  • Optional Ethernet interface with PoE
  • Optional M-Bus board
  • Optional precision calibration at -40 °Ctd or 3 °Ctd incl. ISO certificate
  • Standard measuring chamber for compressed air up to 16 bar
  • High pressure measuring chamber up to 350 bar available.

Model numbers

  • 0699 0501
  • 0699 0502
  • 0699 0503

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