Using the Model 1500 Portable Chilled Mirror Hygrometer

The Model 1500 is a portable, multi-function, optical chilled mirror hygrometer designed to accurately measure the moisture content in gases.  It offers precision dew point measurement in a robust, transportable carrying case.

The Model 1500 uses the chilled mirror (CM) dew point temperature condensation principle to determine the water vapor concentration in gas mixtures, and a precision platinum resistance thermometer to measure the mirror temperature.  The CM uses a thermo-electric chiller to control the temperature of the chilled mirror . Since it is a direct measurement of dew point and thus a Primary Standard Measurement Technique, the Model 1500 is highly regarded by calibration technicians and manufacturing facilities for its portability, accuracy, quick dry down, fast response and long life.

The Model 1500 may be fitted with a precision air temperature sensor (needed to determine RH), pressure transducer, and a wide range of either local or remote chilled mirror sensors. Three main types of chilled mirror sensors are available for the 1500: the remote mounted D-Probe featuring a two stage air cooled chilled mirror. The S-Series sensor- available in both local and remote mount configurations.  Depending on the desired measurement range, the S-Series sensor is available in Two or Three stage chilled mirror configurations.  To accommodate different cooling thresholds, the S-Series sensor may be air cooled, fan cooled or liquid cooled.  In contrast, the D-Probe is only available as a Two-Stage chilled mirror. But since it is configured as a probe, it may be used in a wide array of applications including ambient air monitoring, insertion into glove boxes, HVAC ducts, environmental test chambers, circulation pipes, refrigerated storage rooms, engine test filter rooms,…   The new X3 Chilled mirror has recently been configured to operate within the model 1500 platform.  The X3 is available in several models and offers the USER chemical resistance to aggressive background gases, fast response time and ability to measure very low dew point limits without the need for liquid cooling.  Please refer to the X3 brochure for more information.


Troubleshooting Dryer Systems
Diffusion Furnaces
Product Drying Chambers
Environmental Testing
Food Packaging
Medical Packaging
Heat Treat/ Annealing Ovens
Chemical Reactors
Cylinder Refill Testing
Fuel Cell Testing
Compressed Air Systems
Pharmaceutical Powder Drying

The Model 1500 offers many standard features including:


  • PRIMARY STANDARD MEASUREMENT:  Chilled Mirror measurement technique
  • NIST Traceable calibration certificate
  • Automatic Balance Cycle (ABC) automatically re-standardizes and corrects for contaminants
  • Choice of Analog Outputs (4-20 mA or 0-5 VDC)
  • RS-232 Serial Interface
  • Programmable electrically isolated alarm relay, 1 FORM C
  • Integral Flowmeter for control and viewing sample flow
  • 115/ 230 VAC Battery Recharger
BENEFITS of the Edgetech Instruments Model 1500:
  • Portable unit great for troubleshooting and convenient measurements
  • The CM Sensor is a direct, Primary Standard measurement method, NIST traceable
  • Improve your quality control: Excellent Precision and Stability
  • Reduce Maintenance Costs: Chilled Mirror is robust, long Life with no moving parts
  • Rapid dry-down time in comparison to other technologies
  • Eliminate Scrap or Lost Time: Fast response in responding to upset process conditions
Edgetech Instruments Inc.
An ISO 9001 Certified Company
399 River Road, Hudson, MA 01749
Main: +1 508-263-5900
Fax:+1 508-486-9348

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