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4.4 Temperature
Your source holder may have components that are sensitive to temperature
extremes. Avoid exposure to temperatures beyond the specified limits.
Ambient Temperature
You may use the source holder in continuous ambient temperature conditions
from - 40 °C ... + 60 °C (- 40 °F ... + 140 °F). Minimize direct exposure to
sunlight when ambient temperatures exceed + 40 °C (+ 105 °F).
Process Temperature
Process temperature can affect gauge performance in two ways.
•
Large process temperature changes may affect process densities and the
radiation absorption rates and may cause erroneous readings. Consult
VEGA if inaccuracies related to process temperature changes occur.
•
Extremely hot process temperatures may raise gauge temperatures
through radiated or conducted heat transfer. Use additional insulation,
thermal heat shields, or ceramic isolation spacers to reduce heat
transfer. Use water cooling in extreme situations.
Insulation
Make certain you protect any insulation, between the detector or the source
holder and the process material, from liquids. The absorption of a liquid, such as
water, attenuates the radiation and causes an erroneously upscale gauge reading.
See the Supplemental Information chapter of this manual for
more technical data and specifications.
!
NOTE
4.5 Mounting Instructions
Anyone with basic radiation safety awareness training can mount the source holder
on the process pipe or vessel provided the source is locked in the OFF position
and the following instructions are observed.
Canadian licensees must contain specific wording in their license that allows
these operations.
39089-US-210509
Mounting
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