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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.

Options include:

• ±0.1% accuracy pressure transducer, for measuring mixing ratio (ppmv or lbs/MMSCF)
• an ambient temperature sensor for measuring absolute or relative humidity.

These outputs are available on the optional 4-line LCD display and on both serial RS-232 and analog outputs.

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.

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

About Buck Research:

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