VICI 450 Dynacalibrator - Manual (Page 41)

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Troubleshooting
Pneumatic Troubleshooting
There are two reasonably direct methods that can be used to troubleshoot
leaks in a Dynacalibrator, each with its advantages and disadvantages. The
first method, using leak detection fluid, (Leak-Tek, Snoop, soap solution, etc.) is
relatively fast but is somewhat messy and requires careful cleanup after the leak
is located and repaired. The second method, isolating components by breaking
connections, can consume more time but does not require cleanup.
Leak Detection Fluid Method
1. Remove the 12 allen cap screws from the upper cover and remove the cover..
2. Trace out the internal plumbing loop that has been found to be leaking,
starting at the point where the leak checker gauge has been connected and
ending at the point where the air source has been connected. Be sure you
have not overlooked any fitting, joint, or other possible point of leak in this
loop. (The loop is the entire set of internal plumbing that was subjected to
the leak checking charging pressure of 20 inches of water.)
3. Open the valve on the air source and slowly charge the unit until the gauge
reads 20 inches of water. Close the valve on the air source.
4. Isolate the leak by using a small quantity of leak detection fluid on each
possible leak point in the suspect loop. Watch carefully for the bubbling or
foaming effect that characterizes a leak.
Most leaks that arise under internal pressures of 20 inches
of water will be small. Because of this, be sure to watch
carefully for a full 30 seconds before concluding that the
point being tested does not leak.
5. Repeat steps 3 and 4 for each potential leak point in the suspect loop.
6. Tighten or remake any connection or joint that has been found to be leaking.
Replace any component whose leak cannot be stopped by the tightening or
remaking proc ess.
7. Rerun the overall system leak checking pro cedure called out earlier in this
section to ensure that all the leaks in the loop have been identified and repaired.
8. Using clean, lint-free rags, carefully wipe up any residual leak detection fluid
from the interior of the Dynacalibrator cabinet.
Component Isolation Method
1. Remove the 12 allen cap screws from the upper cover and remove the cover.
2. Trace out the internal plumbing loop that has been found to be leaking, starting
at the point where the leak checker gauge has been connected and ending
at the point where the air source has been connected. Be sure you have not
overlooked any fitting, joint, or other possible point of leak in this loop. (The
loop is the entire set of internal plumbing that was subjected to the leak
checking charging pressure of 20 inches of water.)