|MEASUREMENT AND CALIBRATION INSTRUMENTS||HUMIDITY CALIBRATORS|
Benefits of the CR-1A
• Wide Range: down to -120 °C (< 1 ppb)
• Fast Response Time: typically 10-20 seconds
• Inherent Stability and Accuracy
• 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.
CR-1A Hygrometer Specifications
|Dew / frost point temperature||-120 to +30°C|
|Lowest Concentration ppbv|
|100 psig (7.8 bar)||<1|
|Reading Accuracy °C|
|Concentration||±2% of reading|
|Typical Response Time||10-20 seconds|
|Temperature||-40 to +60°C|
|Pressure, psia (bar)||0 to 150 psia (0 to 10 bar)|
|Air / Gas flow range||0.2 to 3 liters/min|
|Cooling Mechanism||1.0 L Dewar filled with Liquid Nitrogen (LN2) (optoinal autofill system for continuous use)|
|Standard||115-230 VAC, 50-400 Hz, <30w|
|Optional||24-28 VDC, Battery|
|Outputs||0-10V, 4-20mA, Alarm, RS-232|