Varian 4000 GC, Hardware Operation Manual

Page: 154 / 161

Methane, Isobutane, Ammonia - CI Reagent Gases
(with CI option only)
99.99% purity. One gas cylinder with a two-stage pressure regulator that has a
stainless steel diaphragm and maximum inlet pressure of 30 psi (200 kPa).
Cryogenics
Systems equipped with SPI/1079 injectors or column oven cryogenics require
one of the following:
•
Liquid CO
2
at 850-1000 psig
•
Liquid N
2
at 20-50 psig
If you are not sure which one of these cryogenic options you ordered, check your
purchase order.
How to Install the 4000 MS
To install the 4000 MS, proceed as follows:
1. Connect the GC to a helium source, and then purge the system filters and
columns for 15 minutes.
2. Feed the capillary column and nut through the side of the GC. Connect the
column to the transfer line.
3. Slide the 4000 MS toward the GC until the transfer line is protruding into the
GC oven.
4. Connect vacuum tubing from the rear of the 4000 MS to the foreline pump
with a clamping ring.
5. Connect the power cord from the foreline pump to the rear of 4000 MS (J2
label pump power only).
6. Connect the GC Ethernet cable to the Ethernet port on the computer. There
should be a tee connector and a terminator at each end of the 50-ohm coax
cable.
7. Connect the USB cable to the 4000 MS and the computer.
8. Plug in the GC, ms-spectrometer, and data-system power cords.
9. Switch on the power to the 4000 MS, the GC, and the computer.
10. Bring up System Control on the computer.
11. Select Diagnostics.
12. Check the turbomolecular pump speed. The pump speed should reach the
100% value within 30 min of turning on the power to the mass spectrometer.
13. Bake-out the trap (250 °C) and manifold (120 °C) for at least 2 hours before
you tune it.
120 of 127