Installation
Connecting supply gases
31
After supply gases are connected, the system may be pressurized, and all
installed fittings then checked for leaks.
1. At the HP 5890 flow panel, do the following:
a. Close all detector on/off valves (fully clockwise). Do the same for
capillary makeup gas.
b. Gently close all mass flow controllersby turning them clockwise
only until they bottom, then no further.
2. Perform the following at the source for each gas supply:
a. Turn on the gas supply at its source.
b. Use the following guidelines in setting supply pressures:
Note: Suggested pressure values are defined at the instrument.
If supply tubing is long or narrow, or if multiple devices are
supplied from the same source, pressure at the supply itself may
not represent pressure at the HP 5890.
C
For any gas supplied to the HP 5890 through a local
pressure regulator (e.g., regulators on Accessory 19246A
auxiliary flow panels), set supply pressure at least 69 kPa
(10 psi) greater than the highest pressure to be set at the local
regulator.
C
For carrier gases, set supply pressure into the appropriate
mass flow controller to 345 kPa (50 psi) for column head
pressures up to 207 kPa (30 psi). For greater column head
pressures, set pressure into the mass flow controller to at least
138 kPa (20 psi) greater than the desired head pressure.
C
For capillary makeup gas, set supply pressure to the
appropriate AUX on/off valve (detector flow manifold block) to
276 kPa (40 psi).
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