Introduction
24 Agilent Cary 3500 UV-Vis Spectrophotometer User’s Guide
Compressed gas purging
The sample compartment of the Cary 3500 UV-Vis can be nitrogen or compressed
air purged if the purge tubing is fitted. The gas supply should be attached to the
inlet tube on the back of the module.
You may need to purge the instrument with nitrogen or compressed air under the
following circumstances:
When using temperatures lower than the ambient temperature to prevent
condensation in the sample compartment
When operational conditions are such that environmental vapors or solid
particles could cause damage to optical surfaces.
Purge kit
The Cary 3500 UV-Vis Purge kit, G9891A, includes the 0-30 LPM flow meter and 5
meters of 6 mm OD/4 mm ID tubing. See the Cary UV Workstation Help and
Learning Center for instructions on how to install the purge kit.
Table 4 Purge kit pressure requirements
Cary 3500 UV-Vis Purge Kit
Pressure regulator and gauge
The operating pressure of the Agilent supplied gauge is up to a maximum of
689 kPa (100 PSIG). Always use an appropriate regulator and gauge to ensure that
the purge gas supply is consistently maintained at the correct pressure. If a
different flow meter is used, then the maximum operating temperature will be
different. Refer to the manufacturers advice.
Supply tubing
Use clean, flexible plastic (polyvinyl chloride (PVC) or equivalent) 6 mm OD/4 mm ID
tubing.
Never use rubber tubing, because it may be treated internally with talc that can
be blown into the optical system.
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