Vega SHLM MI4, Руководство по эксплуатации, Страница: 30 / 72

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External Obstructions
Any material in the path of the radiation can affect the measurement. Some
materials that are present during the initial adjustment pose no problem because
the adjustment accounts for the effect of those materials. Examples of such
materials are:
• Tank walls
• Liners
• Insulation
However, when the materials change or you introduce new ones, an erroneous
gauge reading is possible. For example, insulation that you add after adjustment
absorbs the radiation and causes the gauge to erroneously read upscale.
Preferred Orientation
The SHLM MI4 mounts to a nozzle flange on the process vessel. VEGA Americas
provides application drawings based upon your particular application. Make sure
you refer to those drawings for the correct orientation of your source holder.
Figure 4.1
SHLM MI4 Preferred Level Orientation