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Stork Instruments DEWRAY ONLINE

Dewpoint Hygrometer self-cleaning mirror

The DEWRay On-line is a precision chilled-mirror dewpoint hygrometer for the measurement of moisture in air or gases. The operating principle is based on continuous measurement of the dewpoint (or frostpoint) temperature of a gas.Inside the sensor head is a gold-plated copper mirror which is cooled by a two stage Peltier element and an optical dew detection system. A Pt100 resistance thermometer measures mirror temperature. Formation of dew or frost on the mirror surface is detected by the optical system. The temperature at which this happens is known as the dewpoint temperature.It is a well known physical phenomenon that when water vapor in a gas condenses at temperatures below the freezing temperature, super-cooled water may condense instead of ice. The problem is unpredictable. On a new and clean mirror, super-cooled water may form even at temperatures as low as -48°C, in other cases ice may form immediately. This can give significant measurement errors of as much as 4°C in this type of instrument. Some manufacturers of cooled-mirror hygrometers add a microscope to the instrument so that an operator can confirm by human eye if ice or water is present. Others induce formation of ice by a deep freezing cycle.



$5,366.00 USD

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Overview :

Product Highlights

  • Measurement of dewpoint temperature
  • Split-beam reflex optical system
  • AZOR Self-cleaning mirror function
  • 2 independent current outputs 4-20mA and 0-20mA
  • 2 independent alarm outputs
  • Aluminum housing
  • Sensor Head ingress protection to IP65
  • Supply voltage 85V-264VAC
  • Display in Dewpoint °C, °F and gm-3, %RH.
  • Interface RS-232 (RS-485 option)
  • Measuring range: -40 to +60°C
  • Accuracy for dewpoint: +/- 0.2°C
  • Accuracy for temperature: +/-0.1°C
  • Measurement Units: Cdp, Fdp, %RH, gm-3, aw
  • Resolution: 0.1°C
  • Analog output: 2 channels 4-20mA, 0-20mA
  • Alarm output: 2 Alarm/switching contacts, 5A 250V AC/24V DC programable
  • Interface: RS-232 or RS-485
  • Power supply (standard): 85-264 V AC 47/440 Hz, 15VA
  • Operating Temperature: -10°C to +40°C
  • Ingress protection: IP41 For front panel, IP20 for rear of instrument
  • Filter sintered stainless steel
  • Mirror copper, gold plated
  • Mirror temperature: sensor Pt100, 1/3 DIN, 4 wire
  • Maximum gas velocity: 10 m/s
  • Maximum operating pressure: 0,1 MPa
  • Process Connection: M36 x 1.5
  • Connecting cable length: 3m, 5m, 7m
  • Ingress protection: IP65
  • External temperature sensor: Pt100, 1/3 DIN, 4 wire