Product Announcement from Buck Research Instruments, LLC


The CR-5 is a chilled mirror hygrometer that uses a 3-stage thermoelectric cooler (TEC) to enable frost point measurements of as low as ­60 °C, under favorable ambient conditions. It is configured as a transmitter module with an external sensor connected by cable up to 9 feet in length.

Depending upon ambient temperature, the CR-5 can measure dew points as high as 60 °C and can display moisture concentration (ppmv or lbs/MMscf) with optional pressure sensor or %RH with optional ambient temperature sensor. Both of these require the optional LCD display The CR-4 is designed to measure in air and most non-corrosive gases at pressures ranging from near vacuum to up to 100 psia.


CR-5 Specifications:

3 Stage TE Cooler

Dew/Frost Range: - 60 to 60°C *

85°C Depression

Resolution: 0.01°C

Accuracy: ±0.5°C, optionally ±0.2°C

Sample Flow Rate: 0.25 to 3 liters/min

Sample Pressure: 0 to 100 psia

Isolated 4-20 mA Scaleable Analog Output with one 3A Relay output

RS232 Serial I/O

Dimensions: 7.5×8.5×3 inches, transmitter / 6.5×2.5×2.5 inches, sensor

Power Requirement: 24vdc @ 2 amps or 110 - 240 vac @ 50 - 400Hz

*Dependent upon ambient temperature

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