Some test protocols require contamination measurements to be made at cryogenic temperatures, such as satellite IR payloads and ASTM E 1559 materials testing. In this case, an active LN2 cooling loop supplied by the user acts as the low end temperature source for the CQCM.
The sensor uses a resistive heating element to control temperature, with a ΔT of +200°C above its ambient source temperature. A thermally isolated electronics package with internal heater allows for operation at cryogenic temperatures.
|Temperature range||-199°C – 100°C|
|Temperature control||Cryogenic cooling (user supplied) and resistive heating (+200°C range)|
|Temperature measurement uncertainty||±0.5°C|
|Mass sensitivity||1.96 × 10-9 g/cm2 Hz|
|Crystal frequency||15, 16, or 16.8 MHz|
|Frequency measurement uncertainty||±1 Hz|
|Mass||0.51 lb (230 g)|
|Sensor field of view angle||140°|
|Sensor aperture diameter||0.250”|