39089-US-210509
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Operation
5
Operation
5.1 Principle of Operation
The SHLG
®
source holders position and protect a radioactive source near a
process vessel or pipe. Radiation from the source is directed through the
process by an integral collimator. A radiation detector placed opposite the source
holder measures radiation fluctuations caused by process condition changes. The
detector correlates radiation levels to process conditions.
SHLG
source holders operate by rotating the cylindrical shutter over a 90° range.
When the shutter is in the on position, a void slot in the shutter shielding permits the
radiation beam to exit the device. When the shutter is in the off position, the void slot
is perpendicular to the beam and blocks the beam from exiting the device.
Commission the Source Holder
Before any gauge is setup and adjusted, you must commission the source
holder. Depending on the source holder type and the specific license
requirements, the process of commissioning the source holder can include:
•
Inspecting the mounting supports.
•
Testing the source holder for any source material leakage.
•
Conducting open and closed radiation surveys.
•
Performing an occupancy evaluation.
Commissioning Call Checklist
In many installations, a VEGA Americas Field Service Engineer commissions the
gauge. To reduce service time and costs, use this checklist to ensure the gauge is
ready for commissioning before the engineer arrives:
•
Allow access to the source holder for testing purposes.
See the
Radiation Safety Manual
for specific details.
!
NOTE
Summary of Contents for SHLG
Page 1: ...Operating Instructions SHLG Source Holder Document ID 39089 Radiometric...
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Page 4: ...4 39089 US 210509 Revision Table NOTES...
Page 14: ...14 39089 US 210509 For Your Safety NOTES...
Page 32: ...32 39089 US 210509 Operation NOTES...
Page 40: ...40 39089 US 210509 Dismounting NOTES...
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