GE MOA 280i, Руководство по эксплуатации и обслуживанию

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GE Analytical Instruments ©2006 DLM 14291 Rev. A
4-12
accessories kit is a brass 1/8” Swagelok to barbed adapter. Remove the cap from
the oxygen inlet at the back of the NOA and attach the barbed adapter. Use a
7/16” wrench to tighten the nut 1/4 turn past finger tight. Connect one end of the
oxygen tubing to the barbed adapter on the NOA and the other end to the barbed
adapter on the oxygen tank or house supply. Since the flow through the ozone
generator is only 30 mL/min, a low-flow flow controller should be used and the
flow rate adjusted to the lowest flow possible. If the flow is set too high, the
tubing will come off the barbed adapters! Hose clamps can be used to help
secure the tubing. Turn on the oxygen, press CLEAR to view the Supply Pressure
and adjust the NOA’s regulator to 6 psig. If the controller cannot be set to a low
enough flow, a pinhole in the oxygen tubing will prevent the tubing from coming
off of the barbed adapters.
Frit Restrictor
The flow into the NOA is controlled by a metal-frit restrictor in an adapter attached to
the Sample Inlet bulkhead fitting on the back panel of the NOA (Figure 4-3). The
standard restrictor has a flow rate of ~200 mL/min and restrictors with other flow
rates are available. Remove the protective cap and locate the frit restrictor (stainless
steel 1/8” male/female adapter in the accessories kit). Connect the restrictor to the
bulkhead fitting labeled Sample Inlet and use a 7/16” wrench to tighten the nut 1/4
turn past fingertight.
Computer, Printer and Analog Signal Connections
The connections for the computer, printer and analog signal are at the back of the
NOA.
Computer – the RS-232 connector is the 9 pin connector near the top of the back
panel. Two cables are available for connecting the NOA to PCs and Macs. The
cable for PCs is a 9 pin male/9 pin female cable (ACH 09010). Connect the male
end to the NOA and secure with the thumbscrews. Connect the 9 pin female end to
the computer’s COM Port. Some desktop PCs have 25 pin Com Ports and require a 9