Maintenance and Spare Parts
76 Agilent Vapor Generation Accessory VGA 77 and VGA 77P User’s Guide
If there is KI contamination, you need to remove traces of KI as
follows:
1 Disconnect and remove the tubing.
2 Soak the tubes in sodium hydroxide solution (0.5% w/v). Wash
thoroughly with dilute hydrochloric acid and then wash
thoroughly with distilled water.
3 Allow the tubes to air dry in a dust-free location.
4 Reconnect the tubing.
An alternative method of removing traces of iodine from the tubing
and gas liquid separator is to pump a freshly prepared 1% w/v
sodium thiosulfate solution through the system for 5-10 minutes. You
must then remove the thiosulfate by pumping distilled water through
the system for 5-10 minutes.
Replacement Procedures
Pump Tubes
To remove the pump tubes, use the reverse procedure of that given
on Page 27.
Reaction Coil
To replace the reaction coil:
1 Remove the gas/liquid separator as described previously.
2 Remove the thumbscrew holding the reagent manifold cover in
place. Remove the cover by pulling the top of the cover away
from the manifold block and pushing the cover down.
3 Remove the black fluoro-elastomer sleeve from the end of the
reaction coil. Pull the end of the reaction coil through the hole in
the manifold block, then pull the reaction coil out of the channel.
4 Slide the ‘T’ connection and the pump tubing connector out of
their slots. You will find it easier if you remove all of the ‘T’
pieces and pump connectors.
5 Hold the upper ‘T’ piece and sleeve firmly with one hand and pull
the reaction coil out of the sleeve.
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