Patent Number: 052672824
Section: claims

1. A device for monitoring the stack exit air in a reactor installation, essentially comprising: a pressure relief line which connects a containment vessel to a stack;  a filter unit located in the pressure relief line;  a sampling point provided in the pressure relief line downstream of the filter unit for taking a gas sample stream from the pressure relief line;  a sampling line branching off the sampling point and connecting to the stack;  a dilution unit interposed on the sampling line for diluting the gas sample with dilution air to reduce the activity concentration of the gas; and,  a measurement section located downstream of the dilution unit for measuring the activity of the sample gas stream upstream of the measurement section. 2. The device as claimed in claim 1, wherein a heater, which prevents cooling of the gas sample before dilution, is provided in the sampling line. 3. The device as claimed in claim 1, wherein the dilution unit is provided with a plurality of stages.