Overview
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.
The CQCM Assembly consists of three main components: the 36S/C Sensor, 26E/C Electronics, and 106CA Heat Sink. These parts may be purchased separately as spare or replacement parts.
Specifications
| 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” |