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65
CANNON
®
CCS-2100 with VISCPRO
®
Instruction & Operation Manual
Version 2.0a — November 2010;
CANNON
®
Instrument Company
2139 High Tech Road • State College, PA 16803 • USA
Rotor/stator assembly
It may be necessary to return the rotor/stator assembly to
CANNON
®
Instrument Company for service for one of the following reasons:
1. A foreign particle has become lodged between the rotor and the
stator, and is preventing rotation.
2. The rotor and stator are damaged as a result of operating with dirt
particles present in the sample, or as a result of starting the motor
without oil having been charged in the unit.
3. The flexible shaft on the rotor has broken or become detached.
4. Preventive maintenance (
CANNON
®
recommends replacement of
the rotor/stator mechanism every 4,000 hours of operation or every
two years, whichever comes first.)
Removing the assembly
Before attempting to remove and/or replace the rotor/stator assembly,
obtain the most current procedural documentation by calling the service
department at
CANNON
®
.
Checking/reseating the thermistor probe
The thermistor probe may develop an electrical short, or a lead may
break, producing an open circuit. Use an ohmmeter to determine the
probe resistance (it should be approximately 5,000 ohms at room tem-
perature). A short may occur between the two terminals on the plug or
between one of the leads and the metal sheath. The resistance between
the plug and sheath should exceed 50,000 ohms.
More often, poor temperature control can be caused by poor contact
between the thermistor probe and the stator block.
Reseating thermistor probe
If poor thermistor contact is suspected, the thermistor probe should be
removed from the stator well and the contact points cleaned and prepped
per the following procedure:
1. Remove the thumbscrew which attaches the thermistor clamp to the
stator block cover.
2. Remove the thermistor probe from the well hole in the stator block.
3. Clean the thermistor well by hand with a sharp, #31 twist drill
(approximately 3.05 mm (0.120") in diameter) until surface impuri-
ties at the bottom have been scraped away. Remove the accumulated
debris by vacuum from an air jet.
4. Locate the small vial of thermal compound (or other suitable thermal
joint compound) contact solution shipped with the CCS. Stir the
thermal compound thoroughly with a small screwdriver or similar
tool, then apply the material to the tip of the thermistor probe.
5. Replace the thermistor probe in the well hole.