Model 3430 Plus & 3440 Plus
CLEANING THE TUNGSTEN BLOCK
If the tungsten sliding block is not kept clean, it may stick partially
or completely open when the source rod is raised to the SAFE
(shielded) position. This will result in high radiation levels near or
in line with the source rod opening on the bottom of the gauge.
After cleaning and reassembling the gauge as described below,
check the operation of the sliding block by pushing the source rod
into the backscatter position, then returning it to the SAFE position.
You should hear a click as the sliding block snaps shut. Inspect the
opening on the base of the gauge to confirm that the sliding block is
closed. If not, check that the sliding block spring was properly
installed after cleaning. If the sliding block still does not close
properly, immediately contact the nearest Troxler Service Center.
For a list of Troxler and authorized Troxler service centers, refer to
page iii of this manual or visit the Troxler website at
www.troxlerlabs.com/SERVICES/services.shtml
.
The tungsten sliding block may require cleaning if the source rod
becomes difficult to lower into the “measure” position, or if a click
is not heard when the source rod is raised to the SAFE (shielded)
position. An improperly operating sliding block may also result in
erratic or incorrect density readings and increased radiation levels.
WARNING
Do not store or transport the gauge unless the
sliding block is closed. Increased radiation levels
may violate transportation regulations, and may
cause excessive personnel radiation exposure.
WARNING
Removal of the sliding block results in dose rates of
up to one rem per hour in the path of the beam.
Stand clear of the gauge bottom while performing
this procedure and proceed as quickly as possible
while working in the cavity to minimize exposure to
your extremities.
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