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10.0 Troubleshooting
Answers to common operational questions
Mesa is ready to help you with any operational issue you may encounter with your De-
fender. But we may be able to save you some time by providing a short checklist of the
questions most commonly asked of our customer service and technical specialists.
Why won’t my Defender turn on?
If the Defender will not turn on, verify that the battery has been charged. When connect-
ed to the AC power adapter/charger and power is present a small green indicator light
should be visible through the front viewing window
My Defender won’t respond to push-button commands.
If the Defender fails to respond to push-button commands, you can perform a hard reset
of the Defender. This can be done by inserting a paper clip into the reset opening in the
back of the unit.
I’m not sure I have my Defender connected properly.
Verify that the flow source is connected to the pressure port of your Defender for pres
-
sure sources or to the suction port for verifying suction pumps. The unused port should
be at atmospheric pressure with any cap or plug removed. If you are calibrating a gas
that requires an exhaust line to vent the measurement gas, ensure that the tubing is of
sufficient diameter not to create a pressure drop greater then 5 inches of water.
How do I protect against leaks?
Ensure that hose and tube fittings are tight and leak free. The tubing connecting your
flow source (pump, mass flow controller, needle valve, sonic nozzle or restrictor) to the
meter should be kept as short as possible.
What do I do when my leak test fails?
First check to make sure that the leak test cap is on correctly and it is not leaking
through the leak test cap itself. If the leak test cap is correct perform leak test both at
the pressure and suction side. If it fails, contact Mesa Technical Support.
What’s the best way to connect to the filter medium?
When calibrating sampling pumps best results are obtained with the filter medium con
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nected to the pump and the Defender connected to the inlet side of the filter medium
with a short piece of tubing.
Summary of Contents for Defender 530
Page 1: ...Defender 530 User Manual...