PRODUCTS

CR-2 AIRCRAFT HYGROMETER

DATA SHEET and USERS MANUAL

CR-2 main top CR-2 display

Benefits of the CR-2

• Wide Range: down to -100 °C (15 ppb)

• Fast Response Time: typically 10-20 seconds

• Inherent Stability and Accuracy

• NIST-traceable

• Very Low Maintenance

The CR-2 exhibits the same wide range, fast response and high reliability as the CR-1A, but it is designed specifically for aircraft and similar high-stress applications. Instead of using Liquid Nitrogen (LN2), mirror cooling is accomplished using a tactical cryocooler, which is a high-tech device used primarily to cool IR detectors in missiles and tank turrets to LN2 temperatures.

Maintenance requirements for the CR-2 are minimal. Aside from occasional mirror cleaning, the cryocooler needs to be renewed every 10,000 hours of use. Both the control circuitry and the sensing assembly are mounted together into a single compact unit. A separate display module is provided that displays the dew / frost point and housekeeping signals. (For aircraft operation, the display module is not required.)

The CR-2 include a ±0.1% accuracy pressure transducer, essential in demanding applications for compensating the dew/frost point temperature for minute differences between sample chamber pressure and atmospheric pressure.

CR-2 Hygrometer Specifications

Measurement Range
	Dew / frost point temperature	-100 to +30°C
	Lowest Concentration ppbv	15
Reading Accuracy °C
	Entire Range	±0.1°C
	Concentration	±2%
Typical Response Time	10-20 seconds
Operating Range
	Temperature	-40 to +60°C
	Pressure, psia (bar)	5 to 30 psia (0.3 to 2 bar)
	Air / Gas flow range	0.2 to 3 liters/min
	Altitude	0 to 25 km
Cooling Mechanism	Stirling Cycle Cryocooler
Power Requirements
	Standard	28 vdc, < 50 W
	Optional	115-220 vac, 50-400Hz, < 50 W
	Outputs	0-10V, 4-20mA, Alarm, RS-232

CR1A_3_new

Note: These are approximate specifications. Exact performance will vary depending on installation and operating environment. The right to make technical changes is reserved.