5. TROUBLESHOOTING
Page 19
© 2008 DH Instruments, a Fluke Company
5.6
CANNOT ACHIEVE PRESSURE
•
Check that the test gas supply is high enough. Test gas supply must be at least 1/25 of desired
booster output.
•
Check that drive air is set to the correct value and that it is supplied to the booster (see Section 2.3.2).
•
Check that no leaks exist in the pressure circuit from the instrument gas supply to the point-of-use.
Repair any leaks.
5.7
LEAKS
Pressure leaks are the most common problem found in pressure handling equipment. Normally the first
step is to determine if the leak is within the GB-H-152 or outside of the unit.
To determine if the leak is within the unit, you must disconnect it at the
HIGH PRESSURE OUT
port and
plug the port (a DH500 plug is provided in the GB-H-152 accessories). Establish conditions similar to
those under which the leak was observed and determine if the leak is still present. For small leaks, it may
be necessary to install an appropriate pressure sensing device at the
HIGH PRESSURE OUT
port. In
some cases, it is useful to perform simple leak checks on the most common outside sources before
disconnecting the test system. Note that leaks inside the GB-H-152 are unusual unless there has been
some disassembly.
Because of the close fitting components and short tubing runs, some users may find it beneficial to return
the GB-H-152 to a
DHI
Authorized Service Provider for repair rather than performing the troubleshooting
and repair themselves (see Table 2).
More than one leak can exist in a system. Fixing one leak does not guarantee a leak tight system.
Therefore, continue executing the troubleshooting procedures until all leaks are located and corrected.
Since it is impractical to produce a troubleshooting guide that will cover every conceivable leak,
the source of your leak may not be covered in this guide.
The following procedures may require you to tighten a leaking fitting. There are two precautions that
need to be observed when doing this:
•
Never tighten a fitting while it is under pressure. If pressure is in the system and the fitting should fail
while tightening it, you or those around you may be injured.
•
Do not over-torque the compression-type fittings that are inside the GB-H-152. To do so will damage
them requiring their replacement.
Check all fittings and components for leaks. Use leak detection fluid for small leaks. Tighten loose
fittings or replace damaged fittings. Repair or replace leaking regulators.
It is possible that a leak exists in the high pressure section of the gas booster. These leaks are very
difficult to isolate and detect. If no leaks can be found following the above procedures, it is likely the
problem is within the booster. Contact a
DHI
Authorized Service Provider for assistance (see Table 2).
