Fluke Biomedical 940-513 - Manual (Page 19)

Troubleshooting
Troubleshooting
5
5-1
Section 5
Troubleshooting
5.1 Troubleshooting
The Model 940-513 is designed to maintain a positive pressure of 10 psig. Troubleshooting for the Model
940-513 include locating pressure leaks, if any, and operation of the check source solenoid.
Troubleshooting procedures for the detector may be found in the Model 943-27-31 Detector Instruction
Manual.
Other that a pressure leak or a detector fault, the operation of the check source solenoid is the only other
component that may require troubleshooting. If the detector is operating properly, and there is no check
source response, the check source hold-in module, located in the associated Local Control Unit or local
Junction Box, may have failed, or the rotary solenoid may have failed. Using the applicable system level
wiring diagrams, first verify the applicable supply voltage is available. If the supply voltage is available to
the rotary solenoid, the solenoid may have failed, or a component within the assemble may have
loosened, obstructing its movement. The Gas Chamber plug will then need to be removed to
repair/replace the rotary solenoid mechanism.
CAUTION
A 100 microCurie Sr-90 Source Capsule is mounted to
the rotary solenoid. Contact the local plant Health
Physist prior to opening the check source assembly
and handling the check source.
With the power to the associated Local Control Unit turned OFF, the Gas Chamber Cap may be removed
from the sampler. The Gas Chamber plug may then be removed, exposing the check source solenoid
mechanism. Being careful to not handle the Sr-90 source, movement of the rotary solenoid may be
checked. If the movement operates freely, the solenoid may need to be replaced. Refer to the drawings
in Attachment A for additional information.
5.2 Start-up Test
Prior to start-up, the integrity of the sampler should be verified. The operation of the detector check
source should be performed to verify detector operation.
5.3 Periodic Manual Test
Periodically, the pressure integrity of the sampler should be verified. This should be performed whenever
the detector is removed and re-installed. The operation of the detector check source should be
performed periodically, to verify detector operation.
5.4 Recommended Spare Parts