GB-75™ AND GB-152™ OPERATION AND MAINTENANCE MANUAL
©1998-2008 DH Instruments, a Fluke Company
Page 18
5.3
BOOSTER RUNS TOO SLOWLY
A slow running booster means that the pump itself is running slowly which also causes the pressure to be
generated slowly.
•
Check that the drive air
SHUTOFF valve
is in the ON position. If not, set the valve fully to the
ON position.
•
Check that the
DRIVE ADJUST regulator
is set to a pressure of 150 kPa (20 psig) or higher and that
minimum flow requirements are met (see Section 2.2.2.2).
•
Check that there are no restrictions in the shop drive air supply circuit so that adequate flow is
available (see section 2.2.2.1). Remove any existing restrictions. If a filter is installed on the shop
drive air circuit, it may cause an excessive flow restriction.
•
Check that there are no leaks in the shop drive air circuit. Repair any existing leaks.
5.4
PRESSURE GENERATES TOO SLOWLY OR NOT AT ALL
A slow running booster will cause the pressure to be generated slowly. Ensure that the booster is
running properly before continuing (see Section 5.3).
•
Check that the high pressure gas supply is not below 2 MPa (300 psi). If the supply is too low,
increase supply pressure. Speed of booster pressure generation is directly related to the pressure of
the high pressure instrument gas supply. For example, pressure will be generated twice as fast with
instrument gas supply of 14 MPa (2 000 psi) than with 7 MPa (1 000 psi).
•
Check that there are no restrictions in the high pressure gas supply line to the booster. If a restriction
exists, remove it. Restriction may be a valve not fully opened, a regulator with a low flow constant
(CV), an inline filter, small diameter tubing, etc.
•
Check that there are no leaks in the high pressure line from the booster
OUT port
to the
point-of-use. Repair any leaks.
•
Check that the inlet and outlet check valves in the high pressure booster piston are
operating properly. Make sure the high pressure gas supply to the booster
IN port
is 2 MPa (300 psi)
or greater and
the drive air is set to at least 400 kPa (60 psi). Close the drive air
SHUTOFF valve
. Shutoff the high
pressure
OUT port
near the port or, better yet, plug the port directly with a DH500 plug.
•
Open the drive air
SHUTOFF valve
. The booster should cycle several times then stall. If the
booster does not stall, the check valves are the most likely cause. In this case, the booster needs
service. Contact a
DHI
Authorized Service Provider.
