DH Instruments GB-K-152, Руководство по эксплуатации и обслуживанию

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GB-K Gas Booster Package Operation and Maintenance Manual
© 1998 - 2000 DH Instruments, Inc .
Page 16
q
Adjust the Low Pressure Outlet Regulator (12) by rotating the knob clockwise until the
desired pressure is indicated on the Low Pressure Outlet Gauge (5).
To correctly set the pressure, gas flow must not occur. If flow is present in the circuit
when the regulator is adjusted, the pressure will increase when flow is reduced. If the
setpoint is exceeded see Section 3.2.2.
3.2.2 DECREASING PRESSURE
The Low Pressure Outlet Regulator (12) is a non-venting type. It is not possible to regulate
pressure down without gas flow through the regulator.
n
Open the low pressure circuit to atmosphere to allow a slow gas flow through
the regulator. The amount of flow through the circuit should not be greater than the
regulator’s ability to flow gas. If this occurs, a flow related pressure drop will be created
across the regulator resulting in erroneous pressure settings.
o
Adjust the Low Pressure Outlet Regulator (12) by rotating the knob counter-clockwise
until a pressure below the setpoint is achieved.
p
Close the low pressure circuit to prevent gas flow through the regulator.
q
Adjust the regulator by rotating the knob clockwise until the desired pressure is indicated
on the low pressure gauge.
3.3 SETTING HIGH PRESSURE OUTPUT UP TO SUPPLY PRESSURE
All previous sections (especially Section 2.3) should be read, understood and instructions carried out
before continuing.
It is not necessary to operate the gas booster pump when setting pressures up to the value of
the source. The gas booster pump will not stop the flow of gas to the input of the Low Pressure and
High Pressure Regulators. Source pressure is always present at the inlet of the regulators whenever
it is supplied to the GB-K.
3.3.1 INCREASING PRESSURE
n
Close the High Pressure Outlet Regulator (7) by rotating the knob counter-clockwise until
no spring force is felt.
o
Apply instrument gas to the supply inlet.
Ensure the 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.