Teledyne 6712SR - Manual (Page 156)

6712SR Refrigerated Sampler
Section 8 Maintenance
8-8
CAUTION
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.
8.5 Replacing the Pump
Tube
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.
Checklist For Replacing Pump Tube:
1. Disconnect power from the sampler.
2. Loosen the liquid detector’s cover by unscrewing the black
knob on top of the detector. Unlatch the pump band. (The
band is the rounded metal band that holds the tube in the
pump.)
3. Pull the tube away from the bulkhead fitting. Pull it from
the pump and detector.
4. Clean the pump rollers and the inside of the pump band.
5. Thread the new tubing through the pump so that the tube
follows its natural curve around the pump rollers. You may
need to move the pump rollers to make the installation
easier.