Valco Instruments Co. Inc. 340-0X, Инструкция по эксплуатации

Страница: 40 / 44

36
Troubleshooting
If you intend to perform detailed troubleshooting on your Dynacalibrator,
please first read the section entitled “Advanced Theory of Operation” which
starts on page 27. The flow diagrams included there will provide significant help.
Most gas flow problems can be isolated to a particular component using a low-
pressure air source and a pressure gauge.
Electrical Troubleshooting
Since electrical components are incorporated into circuit boards, there is little
that can be done by the user other than resetting tripped circuit breakers. If the
breakers continue to trip, the unit must be returned to the factory for repair.
Always completely disconnect main power from the
Dynacalibrator before reaching inside the unit. Use clip-on
probes installed while main power is disconnected to make
all test point connections for hot checks. Reconnect power
only after test connections are properly made and hands are
withdrawn from inside the unit. Failure to observe this warn-
ing can result in severe electrical shock and serious injury to
personnel.
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. To remove the top cover, unscrew the six allen screws on each side of the
instrument, above the side bars.
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..