Dewpoint Transmitter

     Typical Applications

  • Monitoring and control of air dryers
  • Plastic dryers
  • Welding gases
  • Laser gases
  • Petrochemical feedstock gases
  • Natural installations, transportation and distribution
  • Clean rooms
  • Glove boxes
  • Cryogenic gases
  • Heat treating furnaces
  • Industrial specialty gases


  • Compact and reliable. Continuously monitors air dryer performance, compressed air quality and dry gas moisture, from ambient dewpoint levels to as low as -148º F (-100º C).
  • The transmitter uses the state of the art microprocessor technology built-in intelligent features.
  • User friendly interface with LCD display and push buttons.
  • User selectable Engineering Units Dewpoint in º C or º F, ppmv,
    g H2O/m3, lbs H2O/ million scf.
  • Pressure correction feature.
  • Field calibration procedure is fully automated and the user is prompted through a simple one minute procedure, which requires no additional equipment.
  • Unit has indication for sensor open, short or electronic system failure, which can activate any of the alarm relays.

 Available Options

  • Alarm relays can be programmed to switch at any dewpoint with variable hysteresis, making it ideal as an energy saving  component in desiccant dryers.
  • The analog current or voltage output can be programmed to span the full or a portion of the range and is linear to the  selected engineering units.
  • The RS-232 interfaces into the serial port of any PC or Mac, for a simple operation with any standard communications  program.


Sensor Type:
High capacitance Al2O3
Input Resolution:
0.1º C dewpoint
LCD with backlight, 3.5 digits and custom legends for units and mode, audio alert
Engineering Units:
Dewpoint in º F and º C, ppmv, g H2O/m3, lbs H2O/mm scf
4 push buttons, all settings stored in EEPROM
Output Options:
4-20mA, 0-24mA or voltage outputs, linear to selected
engineering units, programmable span and range,
0.1º C dewpoint resolution.
RS-232, baud rate 9600, resolution 0.1º C dewpoint
Sensor is isolated from the power supply, analog output
and RS-232.
Alarm Relays Option:
Two programmable alarm relays with programmable
variable hysteresis, rated at 10A @240V. Failure
indication programmable to trigger alarm relays.
Power Requirements:
100 - 240 VAC, 50 or 60 Hz, autoranging or by order
12VDC or 15-30VDC 0.5A
Pluggable screw terminal block
Polycarbonate, Nema 4/4x Dimensions
W-12cm x H-16cm x D-9cm ( W-4.7” x H-6.3” x D-3.5”); DIN 43700 - 8cm (3”) deep.
Temperature range of electronics:
-10º to 50º C (14º to 122º F)
Optional Features:

a) Medical Breathing Air Monitoring and Alarm Option,
complies with the recommendations of NFPA 99, 1996

b) On-board battery backed real-time clock option,
facilitating Scheduled Timer Activated Single Point Self
Calibration/Verification procedure for sample systems
equipped with an electrically actuated switchover valve.

1 year.