back button black v05

New FAST way to increased accuracy of the Optidew Cooled Mirror Hygrometer

New FAST way to increased accuracy of the Optidew Cooled Mirror Hygrometer

13 July 2008

Michell instruments has developed a new technology to increase the accuracy and reliability of their cooled mirror instruments. The Frost Assurance System Technology (FAST) works by ensuring that, for temperatures below 0°C, the ‘dew point’ reading is always taken from the formation of ice crystals, rather than water droplets.

The new system is now being incorporated into the Optidew range of cooled mirror instruments. Although these hygrometers are already highly accurate, being able to give moisture readings down to a level of -40°Cdp, some applications need even higher levels of accuracy.

Water doesn’t always freeze at 0°C – in some circumstances super-cooled water can exist at much lower temperatures. This can be caused by contaminants in the gas being tested for moisture, or even build up of residue on the cooled mirror surface. Super-cooled water condenses at a slightly different temperature to ‘normal’ ice formation, and the errors involved are typically equal to 10%.

Michell Instruments' FAST technology was invented in order to avoid this effect by taking a specially developed routine where the mirror temperature is controlled and adjusted at certain levels. This means that accurate and reliable readings can be taken time and time again with no human intervention needed.

Michell Instruments FAST technology is currently available on the Optidew range of cooled mirror instruments.

About Michell Instruments

Michell Instruments is the international leader in the field of moisture and humidity measurement solutions. With over 30 years experience, Michell designs and manufactures a wide range of transmitters, instruments and system solutions capable of measuring trace moisture, humidity and dew point in a vast range of applications and industries ranging from compressed air, power generation, process, oil and gas, pharmaceutical and many more. With a fast growing international subsidiary and distribution network, Michell provides solutions in moisture and humidity to the most demanding customers across the globe.

About Rense Instruments

Rense Instruments is an industry leader in the development and production of humidity and temperature measuring sensors, humidity portable and laboratory instruments and calibration transfer standards. Rense Instruments was acquired by Michell in January 2006 and completes Michell Instruments product range in humidity solutions. Rense instruments expertise spans over three decades focusing on serving customers with solutions for HVAC, energy management, storage and many other general industry and OEM applications.

  • Process Sensing Technologies PST GmbH
    Max-Planck-Straße 14
    61381 Friedrichsdorf
    Germany / Europe
    Tel.:+49 (0)6172 5917-0
    Fax:+49 (0)6172 5917-99
    Web :
  • company website button
  • all entries button

back button black v05