61
Maintenance
5. Prepare the inlet tubing (part no. 590=050=060 from the maintenance kit). Again, the
process is slightly different depending on the analyzer model in use (sulfuric acid or nitric
acid chemistry).
9120 analyzer with sulfuric acid chemistry:
a. Cut 4 lengths of tubing of 90 cm each and proceed to the step 6
9120 analyzer with nitric acid chemistry:
a. Using a scalpel, cut one end of the tubing to form a point approximately 30mm
long, to enable the tube to be passed through the ferrule:
WARNING
Always take care when using scalpels. Always make tube cuts away from the body
and keep fingers away from the blade.
b. Slide the fitting nut onto the tube. Slide the ferrule over the pointed end and onto
the tube as far as possible without forcing it, and ensuring the PTFE seal is facing
towards the pointed end of the tube:
c. With the aid of long-nosed pliers or similar, pull the pointed tube end through the
ferrule until the PTFE sealing surface has reached the uncut section of the tube.
Keeping the ferrule as perpendicular as possible to the tube will ensure the best
results. Rotate the ferrule around the tube 3 or 4 times to seat the ferrule on the
tube correctly:
d. Using a scalpel, cut the pointed tube end as close to the ferrule as possible,
ensuring the end of the ferrule is not cut:
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