INSTRUMENTS LLC
PO BOX 19498
BOULDER, CO 80308
PH: 800.HUMIDITY
OR 303.442.6055
FX: 303.443.2986
CR-1A CRYOGENIC HYGROMETER
Benefits of the CR-1A
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Wide Range: down to -120 °C (< 1 ppb)
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Fast Response Time: typically 10-20 seconds
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Inherent Stability and Accuracy
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NIST-traceable
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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.
Options include a ±0.1% accuracy pressure transducer, for measuring mixing ratio (ppmv or lbs/MMSCF) and 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.
To download a product brochure detailing the CR-1A specifications, click here.
To download the Operating Manual for the CR-1A Model, click here.
| CR-1A Hygrometer Specifications |
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| Measurement Range | |||
| Dew / frost point temp. °C | -120 to +30°C | ||
| Lowest Concentration ppbv | |||
| sea level | < 1 | ||
| 100 psig (7.8 bar) | < 1 | ||
| Reading Accuracy °C | |||
| Entire Range | ±0.1°C | ||
| Concentration | ±2% of reading | ||
| Typical Response Time | 10-20 seconds | ||
| Operating Range | |||
| Temperature °C | -40 to +60°C | ||
| Pressure, psia (bar) | 5 to 115 psia (0.3 to 7.8 bar) | ||
| Air / Gas flow range liters/min. | 0.2 to 3 liters/min | ||
| Altitude, km | 0 to 25 km | ||
| Cooling Mechanism | 0.2 L Dewar filled with Liquid Nitrogen (LN2) | ||
| Power Requirements | |||
| Standard | 115-230 VAC, 50-400 Hz, <30w | ||
| Optional | 24-28 VDC, Battery | ||
| Outputs | 0-10V, 4-20mA, Alarm, RS-232 | ||
| Note: These are approximate specifications. Exact performance will vary depending on installation and operating environment. The right to make technical changes is reserved. | |||
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