Vega FiberFlex LFXG-H, Operating Instructions Manual

Page: 31 / 102

Installation
LFXG-H Installation and Operation Guide 29
Location considerations
When you ordered the gauge, VEGA sized the source for optimal
performance. Notify VEGA before installing the gauge if its location differs.
Satisfactory operation depends on proper location.
Stable temperature
Mount the gauge on a portion of the line where the temperature of the
process material is relatively stable. Process temperature can affect the
gauge indication. The amount of the effect depends on:
• Sensitivity of the gauge
• Temperature coefficient of the process material
Protect insulation
Protect from liquid any insulation between the measuring assembly and the
process. The absorption of a liquid, such as water, can affect the gauge
indication because it blocks some radiation.
Avoid internal obstructions
The best possible installation of a nuclear level gauge is on a vessel that
has no internal obstructions (example: agitator, baffle, man ways) directly in
the path of the radiation beam. If one of these obstructions is present, it can
shield the radiation from the detector, causing an erroneous reading.
Note: Locate the source holder where process material cannot coat it.
This ensures the continuing proper operation of the source ON/
OFF mechanism (if applicable). Many regulatory bodies
(example: the U.S. NRC) require periodic testing of the ON/
OFF mechanism.
See the Radiation Safety for U.S. General and Specific
Licensees, Canadian and International Users Manual and the
Radiation Safety Manual Addendum of Reference Information
that came with the source holder and the appropriate current
regulations for details.