PCB’s quartz rocket motor sensors measure combustion instability in rocket engines. These sensors are structured with acceleration-compensated quartz sensing elements and are available in both charge and ICP® voltage mode output versions. Three physical configurations are available with helium bleed, helium bleed and water-cooling, and water-cooling only. Helium bleed serves to protect the quartz sensor from the intense heat. Helium being less dense than air also increases the frequency response of the recess gas passage.

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• Series 122 helium-bleed sensor is well suited for shortduration combustion instability measurements in solid rocket motors. This sensor features a 10-micron helium filter to control the helium flow rate to the sensor body and connecting passage. The element is acceleration compensated and has a two-microsecond rise time, enabling it to capture fast pressure fluctuations. 

• Series 122 is available in both ICP and charge mode models. Special long designs have been supplied to accommodate mounting wall depth up to 18 inches.

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• Series 123 rocket motor sensor is designed to measure combustion instability on some of the highest-energy rocket engines. The unit is suited for long duration measurements, or environments where severe temperature increase in the sensor mounting wall (or high soak temperature after shut down) exists.

• The unit incorporates helium-bleed, water cooling and two piece construction. Available in ICP and charge designs, a ceramic-coated end piece protects the sensor from the intense flow and environment.