Replacing The Pump Tube - Teledyne 6712FR Installation And Operation Manual

8.5 Replacing the Pump
Tube
Tests indicate that the pump produces sound levels in excess
of 85db at one meter. Prolonged exposure to this sound level
could result in hearing loss and requires the use of protective
ear plugs.
Distributor Test – The distributor test is provided for factory
personnel to verify the distributor's position as it rotates through
the 24 positions. (screens 9 through 11). The distributor arm
flexes slightly when it contacts the stop, and the sampler mea-
sures this flexure. The sampler uses this measurement to
position the arm accurately over each bottle.
Reinitialize Controller – The sampler allows you to reset all
the program settings to the settings shipped with the sampler
(screen 12). Reinitializing also clears the memory that stores the
sampler's event log and module data. Use this option cau-
tiously.
Replace the pump tube only with Teledyne Isco's 6712 pump
tubing. Other pump tubes will not work. The 6712 pump
tubing is easily recognized by the blue alignment collars.
Improper pump tubes include those made for Teledyne Isco's
other samplers (3700, GLS, etc.) and tubing from non-Teledyne
Isco vendors. Also note that the discharge tube is not the same as
the pump tube. You could experience several problems if you
install the wrong pump tubing:
• The sampler will not pump the liquid.
• Pump jams
• Inaccurate sample volumes
• Faulty liquid detection
Inspect the pump tube periodically. Replace the tube when it
cracks or appears worn. Inspect the tube frequently when the
sample liquid contains a high percentage of suspended or
abrasive solids.
Note
The importance of regular tubing replacement cannot be over-
stated. The key is to replace the tube before failure, not after.
When a pump tube ruptures, grit and other abrasive debris can
be driven into the pump shaft seal. Over time, this abrasive
material will degrade the pump seal, jeopardizing the
NEMA 4x 6 rating of the controller.
Failure to maintain the pump tube may result in permanent
damage to the sampler. Check the condition of the pump tube
regularly and if the tube shows signs of fatigue or wear,
replace it immediately. A properly maintained sampler will pro-
vide the years of reliable service that is expected of an Isco
Sampler.
6712FR Refrigerated Sampler
Section 8 Maintenance
CAUTION
8-9