UHQ-4P chilled mirror hygrometer

Featured Product from Buck Research Instruments, LLC


The UHQ-4P is a chilled mirror hygrometer that is designed for measuring elevated dew points, such as those found in fuel cell and combustion applications Using technology developed for the CR-1A, CR-2 and CR-3, this instrument is unique because it does not use TE coolers to cool the mirror and thus is extremely fast and can handle very high temperatures. The UHQ-4P can measure dew point up to 150°C at pressures up to 150 psia (10 bar). It can display %RH with an optional ambient temperature sensor. The UHQ-4P is designed to measure in hydrogen, air and most non-corrosive gases at pressures ranging from near vacuum to up to 150 psia (10 bar).

UHQ-4P Specifications:

  • Dew Point Range: ambient to 150°C *
  • 50°C Depression
  • Resolution: 0.01°C
  • Accuracy: ±0.2°C
  • Sample Flow Rate: 0.1 to 0.5 liters/min
  • Sample Pressure: 0 to 150 psia
  • 0 to 10v and 4-20 mA Scaleable Analog Output
  • RS232 Serial I/O
  • Dimensions: 8x10x10 inches
  • Power Requirement: 24vdc @ 3 amps or 110 – 240 vac @ 50 – 400Hz

*Dependent upon ambient temperature

Buck Research Instruments provides the most advanced accurate and reliable humidity instrumentation available for industrial, laboratory, calibration standard and airborne use, emphasizing high performance chilled mirror technology.

Products Include:


Watch our >>Webinar Now On-Demand:Humidity Measurement FAQ

Key Take-Aways:

  • Learn important humidity terms and the physics behind them.
  • Explore examples of the different technologies that can be used for measuring humidity.
  • Acquire a better understanding of proper sample system design and some of the main causes of measurement error when making humidity measurements.
  • Understand the importance of leak-checking and proper heat tracing for applications that require them.
  • Examples of chilled-mirror hygrometer solutions that BRI has provided to its customers

Buck Humidity Calculator for iPhone

The brainchild of Buck Research Instruments, Buck Humidity Calculator is a simple tool that allows you to do humidity calculations and conversions of dew point, mixing ratio, vapor pressure, relative and absolute humidity.

Click here to get the app from the iTunes store!

Buck Research Instruments

OUR MISSION To provide the most advanced, accurate and reliable humidity instrumentation available for industrial, laboratory, calibration standard, and airborne use, emphasizing high performance chilled mirror technology

OUR FOCUS Buck Research Instruments specializes in producing High Performance Chilled Mirror Hygrometers that offer fast and accurate measurements while maintaining exceptional reliability inherent only to chilled mirror operating principles.

COMPANY HISTORY Buck Research Instruments was founded in 1989 by Arden Buck, an internationally recognized authority on water vapor measurement, who is credited with major advances in the state of the art and has authored over 30 scientific papers. Buck Research Instruments has continued to develop new and advanced  hygrometry instruments with state of the art performance.

FOR OVER TWO DECADES Buck Research Instruments has provided cryogenic hygrometers to NASA and others for use in a variety of high-altitude atmospheric research flights. Our products have been used in the stratosphere, as well as in demanding laboratory and industrial applications around the world.

High Performance Hygrometers for:

  • Industrial Use
  • Laboratory Use
  • Calibration Standard
  • Airborne Research

BRI specializes in producing high performance chilled mirror hygrometers that are exceptionally fast, accurate, and operate over a very wide humidity range.

We ensure temperature reading accuracy by using ultra-stable mirror temperature sensors that are calibrated against a NIST-traceable reference standard.