940-3MS main stream fission product monitor
The Model 940-3MS consists of a field mounted detector shield, a GM gamma detector, a preamplifier and an electrical junction box for each steam line.
A remote, control room located, universal digital ratemeter (UDR) provides the detector high voltages and DC operating voltages, processes the detector output, performs limit checks, generates analog output signals and displays the net fission product activity for each detector. Because of the stability of the GM detector over the operating temperature of the monitor, automatic gain stabilization of the detector output is not required. Where additional system features are required, the Model 960 Digital Process Radiation Controller may be supplied in lieu of the UDR.