Gow-Mac 5900 Series, Руководство по эксплуатации

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Series 5900 DID GC
1019, Rev. 1
15
A. The Purge Helium control valve found in front of the instrument oven section is a
combination high flow and low flow metering valve, known as a combo valve. The
outer knurled knob controls the high flow control function and the screwdriver-
adjustable inner knob controls fine flow metering.
B. Turn ON the instrument grade helium gas flow at the regulator. This flow is factory
adjusted and should be set to 30 mL/min. for continuous operation after the air has
been purged from the system. If adjustment is needed:
1. Open the outside combo valve knob (counterclockwise) to get fast purge flow.
The inside knob can be in any position and will not affect fast purge flow.
2. Fast purge for about one (1) minute, then turn the outer knob clockwise all the
way to shut off the fast flow.
3. Adjust the low (operating) purge flow to 30 mL/min using the inner knob. Typical
low flow purge time required before analysis is 12 to 24 hours.
3.12 Carrier Gas Flow Adjustment
A. This instrument is equipped with a maximum of six (6) bellows metering
valves. They are used to set carrier flows through the columns and system. For
making initial flow adjustments, all valves should be in the counter clockwise
starting positions (blue color on LCD display).
B. Turn the Helium carrier ON at the regulator. Allow CARRIER to flow for
about one (1) hour to purge air out of system. The operator must reference the flow
system drawing specific for the SERIES 5900 model.
C. CARRIER 1 flowrate should be set to read 30 mL/min. from the rotameter (located
on the front of the GC) when the 4 port Sample Isolation Valve is in the CARRIER
position. Adjust flow by manipulating CARRIER 1 Metering Valve.
D. Turn Sample Isolation Valve to SAMPLE and set flow rate by adjusting the metering
valve in the SAMPLE supply line (supplied in GOW-MAC Accessory Package #59-
595).
Sample Isolation Valve should be kept in the CARRIER position except for when
making an injection. This keeps the sample gas from penetrating the Injection
Valve rotor and causing sample cross contamination.
E. Turn OFF the DETECTOR GAS flow rate by using the DETECTOR GAS
BELLOWS METERING VALVE (DETECTOR HELIUM) on the front of the GC.