Installation
36 Cary 100/300/4000/5000/6000i/7000 Spectrophotometers User’s Guide
Pressure regulator and gauge
Operating pressure is from 83 to 172 kPa (12 to 25 psig). Always use
an appropriate regulator and gauge to ensure that the nitrogen
supply is consistently maintained at the correct pressure.
Supply tubing
Use clean, flexible plastic (polyvinyl chloride (PVC) or equivalent)
tubing of 6 millimeter (1/4 inch) internal diameter. Never use rubber
tubing because it may be treated internally with talc that can be
blown into the optical system.
CAUTION
Never use rubber tubing, because it may be treated internally with talc that can
be blown into the optical system.
Figure 11. The position of flowmeters when purging with nitrogen
1) Instrument 2) Sample compartment 3) Tubing
4) Flowmeters 5) Shut-off valves 6) Manifold
7) Pressure regulator 8) Nitrogen control valve
Procedure
You may need to purge the instrument with nitrogen under the
following circumstances:
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