Gas leak sensor system esp. for refrigeration system

摘要

Tubes extend from each of the test spaces to a sensor location. A selector valve is connected to each tube. A gas sensor has an alarm with a control to actuate the selector valve to select tubes in a partic. order. The selector valve is connected to draw air and any leaking gas through the selected tube and through the gas sensor. The gas sensor is purged at least when leaking has been sensed. A purging gas inlet is remote from the test spaces. The purging device pref. purges the gas sensor to outside air at a first location.