Vega SHLM MI4, Руководство по эксплуатации, Страница: 33 / 72

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4.6 Principle of Operation
The SHLM MI4 is mounted onto a source well that extends into the process tank
or vessel. In addition, the SHLM MI4 is used to position and protect a radioactive
source in the process tank or vessel using a retractable stainless steel cable.
Radiation from the source is broadcast through the process material and out of
the vessel. A radiation detector placed outside the vessel measures radiation
fluctuations caused by process condition changes. The detector correlates
radiation levels to process conditions such as level and density
.
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.
• Have process ready for adjustment.
• To ensure the most accurate measurement, a process adjustment is
necessary. This adjustment requires establishing and changing vessel
levels. If process material is not available, you may use water in most
cases.
See the Radiation Safety Manual for specific details.
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NOTE