965 Stack Monitor
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965 Stack Monitor - 1

Trusted radiation protection. Technical Data Stack Monitor The 965 Stack Monitor is a single-channel radiation monitoring system which operates over the range of 10 to 107 CPM. The system monitors gamma radiation and provides indication when the radiation level decreases below a fail threshold, exceeds a warn set point, exceeds a high set point or exceeds an overrange set point. The overrange feature provides two significant benefits. First, it prevents the system from displaying an on-scale but inaccurate reading should the detector become saturated. Second, it lessens the risk of damaging the detector by disabling it during an overrange condition. Relay outputs are available to activate alarm annunciators. Analog outputs are available for trend display on a strip chart recorder or computer. Also, the monitoring system has an integral check source to verify operational integrity. The system consists of a 943-36CS Gamma Scintillation Detector and a 942A Universal Digital Ratemeter (UDR). The 965 Stack Monitoring system can be used in any size or shaped stack. Since the detector mounts directly in the stack, there is no need for an expensive, high-maintenance off-line monitoring system. This monitor can be used as a single channel stand-alone, or grouped together in a multi-channel monitoring system. The standard UDR is factory-modified to include three option boards to allow for Key features • Count Range: 107 CPM • Energy response: 15 % from 70 keV to 3 MeV • No external power needed at detector location • Preamplifier integral with detector • Ratemeter may be remotely located up to 1500 feet • Single cable between ratemeter and detector • 8 µCi 137Cs check source capsule • Replaces high maintenance off-line monitoring system • Deadtime correction < 1 % at 107 CPM • User adjustable alarm set points • Seismically tested with high reliability • Stack flow monitoring and release calculation computer communications, an analyzer to count 15O only (or other selected isotopes), and flow compensation to measure stack effluent releases. The 943-36CS Gamma Scintillation Detector consists of a scintillation crystal, a photomultiplier tube, a preamplifier assembly and an integral check source. The 943-36CS detector is sensitive to gamma radiation. The scintillation material, photomultiplier tube and preamplifier are contained within a cylin-

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965 Stack Monitor - 2

Trusted radiation protection. drical housing. The preamplifier provides pulse conditioning and cable driving capabilities to match the input characteristics of the ratemeter. The 943-36CS Gamma Scintillation Detector can be used with Universal Digital Ratemeters or with the 960 Digital Radiation Monitoring System (DRMS). Ratemeters are used in systems where individual control room readouts are employed, while the 960 DRMS is used when a complete digital process control system is supplied. The 942A UDR, when connected to a 943 Series Scintillation Detector, comprises a monitoring system that...

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965 Stack Monitor - 3

Trusted radiation protection. Relay outputs (failsafe operation) Detector accuracy (electronic) ± 1 % digit (± 1  of the dis% played value), exclusive of the detector energy response • High alarm: One set. DPDT rated 5 A @ 120 V ac (one set 120 V ac powered for use with optional remote alarm) • Warn alarm: Two sets. DPDT rated 5 A @ 120 V ac • Fail alarm: Two sets. DPDT rated 5 A @ 120 V ac • Contact rating for all relays is 5 A @ 28 V dc Standard Accessories 942A: Universal Digital Ratemeter 943-36CS: Gamma Scintillation Detector Power requirements 960: Digital Radiation Monitoring System...

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