hygrometer for cryogenic applications / digital / benchtop / dew-point
CR-1A Buck Research Instruments



  • Display:


  • Configuration:


  • Measured value:

    dew-point, relative humidity

  • Other characteristics:

    chilled mirror, calibration

  • Applications:

    laboratory, for cryogenic applications

  • Temperature:

    Max.: 30 °C (86 °F)

    Min.: -120 °C (-184 °F)


Benefits of the CR-1A
• Wide Range: down to -120 °C (< 1 ppb)
• Fast Response Time: typically 10-20 seconds
• Inherent Stability and Accuracy
• NIST-traceable
• Very Low Maintenance

The CR-1A is a high performance, cryogenically cooled hygrometer. CR-1 instruments have been routinely used aboard NASA aircraft and elsewhere for years. The CR-1A is a miniaturized version of the original CR-1, and uses a much smaller LN2 dewar. Operating time per filling of LN2 ranges from 6 to 8 hours, depending on the dew points being measured.

A ±0.1% accuracy pressure transducer is included for measuring mixing ratio (ppmv or lbs/MMSCF). There is an optional 4.5 Ah battery pack, and an optional autofill system for continuous use applications.

The CR-1A is designed to operate with virtually no attention. Maintenance demands are minimal, consisting of dewar filling and occasional mirror cleaning as necessary.