GB-75™ AND GB-152™ OPERATION AND MAINTENANCE MANUAL
©1998-2008 DH Instruments, a Fluke Company
Page 12
2.4
INITIAL START UP
After installing the gas booster (see Section 2.3.2), perform the initial start up as follows:
n
Supply drive air: Check that the Drive Air Control Kit
SHUTOFF valve
is in the
OFF
position and
that the
DRIVE ADJUST regulator
is set to zero (fully counterclockwise). Apply drive pressure to the
SHUTOFF valve
(see Section 2.2.2.1 for information on drive air supply requirements).
o
Supply high pressure instrument gas: Check that all connections to the high pressure
IN
and
OUT
ports
are secure. Apply high pressure gas to the high pressure
IN port
(see Section 2.2.2.2 for
information on high pressure instrument gas).
Ensure the high pressure supply does not exceed 20 MPa (3 000 psi). Pressures above this range may
result in a failure that could damage the instrument and/or cause personal injury.
p
Adjust the
DRIVE ADJUST regulator
: Rotate the
DRIVE ADJUST regulator
knob (clockwise)
while observing the set pressure on the
DRIVE gauge
. Set the drive pressure to the maximum
desired high pressure output divided by the booster ratio (75 for GB-75, 152 for GB-152).
For example, if the desired high pressure output of a GB-152 is 70 MPa (10 000 psi), set the drive air
pressure to 70 MPa/152 = 460 kPa (67 psi). Remember that when the
SHUTOFF valve
is in the
ON
position, the booster will operate until the high pressure output is equal to the drive air setting times
the booster ratio.
The DRIVE ADJUST regulator is NOT self venting so it cannot be used to set pressure lower than the
current pressure when the SHUTOFF valve is OFF. If you overshoot the desired set point, set the SHUTOFF
valve to ON until the DRIVE pressure is lower than your desired setting. Then set the SHUTOFF valve to OFF
and use the regulator to adjust the pressure in the ascending direction.
q
Generate high pressure: Set the
SHUTOFF valve
to the
ON
position. The booster will begin to cycle
and will continue to cycle until it stalls. When it stalls, the high pressure output is roughly equal to the
drive pressure setting times the booster's ratio (75 or 152).
