Tubing - Agilent Technologies VGA 77 User Manual

Tubing

Pump Tubes
When the system is not being used, the pressure bar should be
released, the pump tubes removed from around the rollers and
released from the retaining bracket. This will minimize distortion of
the tubes and help to prolong their working life.
To reduce mechanical wear of the pump tubes, the outside of the
tubes and the surface of the pump rollers should be sprayed daily
with a silicone lubricant.
If the procedure specified in 'Shutting Down' on Page 53 is followed,
the system tubing will generally remain clean, however the efficiency
of all pump tubes will eventually be degraded to the point at which
they must be replaced. You should regularly monitor the performance
of each pump tube using flow rate measurements (see Page 44).
Discard the pump tubes as soon as the results of this monitoring
become unacceptable.
The tubes connecting the black-black pump tubes to the pump module may
NOTE
occasionally need to be replaced. To do this, cut four 2 cm lengths of the thinner
black fluoro-elastomer tubing supplied. Place these over each end of two of the
black-black pump tubes.
Fluoro-elastomer Tubing
The fluoro-elastomer tubing connecting the gas/liquid separator to
the absorption cell is particularly susceptible to contamination with
potassium iodide. To avoid this, it is recommended that you dedicate
a separate module to the analysis of those elements requiring pre-
reduction with KI (i.e., As or Sb).
If there is no KI contamination, you can clean the tubing by flushing
it well with distilled water.
Agilent Vapor Generation Accessory VGA 77 and VGA 77P User's Guide
Maintenance and Spare Parts
75