PRODUCTS
CR-1A CRYOGENIC HYGROMETER
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.
CR-1A Hygrometer Specifications
| Measurement Range | ||
| Dew / frost point temperature | -120 to +30°C | |
| Lowest Concentration ppbv | ||
| sea level | <1 | |
| 100 psig (7.8 bar) | <1 | |
| Reading Accuracy °C | ||
| Entire Range | ±0.15°C | |
| Concentration | ±2% of reading | |
| Typical Response Time | 10-20 seconds | |
| Operating Range | ||
| 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) | |
| 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.
