Fluke 875 manual Operation

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Operation

Operation 3

Section 3

Operation

3.1 Operation

Once installation is completed, operation is fully automatic. The 876A-1 Readout Module continuously indicates the level of radioactivity measured at the detector site. When the radiation level exceeds an alarm set point, an alarm is actuated.

The following steps explain how to operate the 875 monitor:

1.Turn the function switch to the TEST position, and press and release the Electronic Check Source (ECS) push button. About four seconds later, the SAFE-RESET light should come on. Then press and hold the CHANNEL TEST push button. The ALERT, HIGH, and CHANNEL TEST lamps should light immediately.

NOTE

When channel test is pressed, the high and alert alarm relays are deactivated. (Their coils are de- energized). The wiring of the channel test circuit is such that the channel test lamp will not light unless the alarm relay contacts are in the deactivated or tripped state. This is for the purpose of assuring that an actual contact state change has occurred, identifying that the channel is in the test mode. Reconciling these alarm conditions is the user's responsibility, since the remote alarms are not included in the standard containment monitor system.

2.Release the CHANNEL TEST push button. The SAFE-RESET lamp should stay on. Either or both of the HIGH (red) and ALERT (yellow) lamps may stay on or go out depending on the alarm reset mode chosen by the installation of jumpers on the alarm circuit board. The monitor is supplied with the manual reset mode selected.

3.To reset any alarm light, press the SAFE-RESET push button. If conditions are normal, the light will go out.

4.Switch the function switch to the ALL position.

5.Again press the ECS push button. The panel meter indicator should go to a reading of about 103 R/h and the green SAFE-RESET light stays on in the operating condition. If the panel meter shows little or no deflection at the pressing of the ECS push button, the green light should go out four seconds after the ECS push button is pressed. In this case, follow troubleshooting procedures.

6.To set the alert and high alarm adjustments, remove two screws in the rear of the chassis, loosen the knurled knob on the front of the chassis, and slide the module forward part way out of the rack to reveal the adjustment potentiometers R513 and R509 on the relay driver printed circuit board. To adjust the HIGH alarm, depress the red HIGH push button and adjust R513 (drawing 876A-1-75A) until the meter indicates the desired alarm level. To adjust the ALERT alarm, depress the yellow ALERT push button and adjust R509 (drawing 876A-1-75A) until the meter indicates the desired

3-1

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Contents High Range Containment Monitor VictoreenFluke Biomedical Table of Contents Calibration and Test Procedures Containment Monitor SpecificationsIntroduction General DescriptionReadout Module 876A-1 Temperature Operating 40 to 120F 4 to 49CHigh-Range Containment Monitor Detector Equipment OverviewRack Chassis Optional Equipment Pull Box AssemblyCables/Connectors/Panel Flexible Tubing 878-12-30TABHigh-Range Containment Monitor Typical Energy Response Curve Detector Typical Linearity Detector Receiving Inspection High-Range Detector, Recommended InstallationStorage Procedures, Warnings, and CautionsBlank Pull Box InstallationInstallation Readout ModuleCable Sealing Specifications for CableDetector Cable Inside Containment Cable and Wiring InstallationDetector Test After Installation Specifications for CableComputer & Recorder Ancillary WiringAll Alarms on P2 Normal Operation Shelf State Power Connections P1Operation OperationVictoreen Functional Description Function DescriptionReadout Module 876A-1 Negative Power Supply FAIL/SAFE Comparison Circuit on Power Supply Board High Voltage Power Supply Normal Operation non-ECS TestOperation of High Voltage Supply During ECS Test Alert Alarm Circuit High Alarm CircuitRecorders and Computer Buffers Fail/Safe CircuitPen Clamp Meter at extreme lower end of scale Panel Meter Action During ECS TestLow Voltage Ramp Generator Action of Green Safe/Reset Light and Alarm During ECS TestMonitoring Circuits of The ECS Board Block Diagram of ECS Test Muting Circuits of ECS Board Safe/Reset Sub-circuitsBlank Maintenance Maintenance, Calibration, and TroubleshootingCalibration Test Procedure TP876A-1-108 Troubleshooting Rear Panel Signal Input CircuitMother Board P/N 876-1-78, Schematic 876-1-3A PreamplifierIMeter Board P/N 876A-1-86, Schematic 876A-1-3ETest Point Normal Channel Test TP501 TP502 +6.3Muting Stages of the Alarm Circuits High Alarm CircuitNormal Low Signal Level Channel Test ESC Board P/N 876A-1-92, Schematic 876A-1-3D Wave Shapes on the Electronic Check Source Board Overall Fail Circuitry Associated with the ECS Test Starting With Pins M and P on the Power Supply SchematicStarting With Terminal H on Relay Driver Board Operation of the Latch Circuit Outputs of U206 Pulse Generator on the ECS BoardCircuit assumed initially in Pass Condition Fail Condition Latch CircuitPin Voltage State Comments NORCalibration and Test Procedures Blank Cable and Pull Box Procedures Cable and Pull Box ProceduresVictoreen Applicable Drawings Applicable Drawings and Bill of MaterialsDocument Number Description Detector Cable Out of Containment Applicable Bill of Materials Fluke Biomedical
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