Inlets and valves
6850
6850
Released: April 2004 6850 Series Gas Chromatograph Service Procedures 84
NOTE: Make sure that the carrier gas source
pressure is a least 35 psi. Carrier source pres-
sure should always be at least 10 psi greater
than the desired inlet pressure.
Performing the leak test—EPC inlets
NOTE: Be sure that the preparation steps on
pages 10 and 11 are complete before proceeding
with this test.
1. Press Inlet. Move to the Pressure field
and enter 25.
2. Wait approximately 15 seconds for equilibra-
tion.
If pressure cannot be achieved, either a very
large leak is present in the system, or the
supply pressure is not high enough.
3. Press Inlet. Move to the Pressure field, and
turn it off.
4. Note the “Actual” reading on the display and
monitor the pressure for 10 minutes.
• If there is less than 1.0 psi pressure loss
(approximately 0.1 psi/min.), consider
the system leak tight.
• If pressure loss is much greater than1.0
psi, there is a leak that must be found
and corrected. See“Replacing the plumb-
ing assemblies” later in this section.
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