Cannon Instrument CAV-2000 - Manual (Page 81)

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CANNON ® Automatic Viscometer Models CAV-2100 and CAV-2200 with VISCPRO ® Instruction & Operation Manual
Version 2g — May, 2009; CANNON ® Instrument Company
2139 High Tech Road • State College, PA 16803 • USA
Bath fluid safety features
The CAV-2100 Bath Unit is equipped with a fluid level float suspended
from the top bath flange at the front of the bath. If the bath fluid level
drops to an unacceptable level, a fluid level float warning will abort bath
operations until an acceptable bath fluid level is restored and the CAV is
restarted.
The CAV-2200 has a flow switch that will prevent CAV-2200 operation if
the pump circulation system is not operational.
Temperature probes
The CAV Bath Unit incorporates temperature sensors suspended in the
bath fluid from the top bath flange. If the bath fluid temperature rises
above normal operating temperatures, the over-temperature thermistor
will abort bath operations until the CAV instrument is restarted and an
acceptable bath temperature is detected.
Sample trays/drains
Both heated and unheated sample trays will slide into place along the
grooved track in the sample table. The plated steel vial adaptors should
be placed in the receptacles in the tray. Glass sample vials slide into the
adaptors. Place the sample tray in the track and slide the tray forward
until the detente mechanism engages. At position 1 (first sample directly
underneath the viscometer tube), a heated sample tray should snap into
position against the detent mechanism when the front of the tray extends
approximately 2 centimeters (3/4”) over the edge of the sample table. The
forward edge of an unheated tray will be indented approximately 2.2
centimeters (7/8”).
Electrical connections For (optional) heated sample trays, connect the keyed three-pin cable
from the sample tray to the interior wall connector above the sample table
(see photo), orienting the cable in a “U” configuration aside the sample
tray. Turn the knurled ring clockwise to engage and secure the connector.
Tray/drain heat operations To provide power to the heated sample trays and/or heated drain lines
which may be installed on your CAV unit, you will use the heater ON/
OFF switches on the left side of the front panel (see diagram, left). These
two switches provide power to left- and right-hand heating elements. To
adjust temperature, use the Adjust knobs on the upper front panel of the
Bath Unit. Turn the knobs clockwise to increase temperature and counter-
clockwise to lower it. The knobs regulate the duty cycle of the heaters for
the sample trays and the drain lines.
The low-temperature sample heaters will maintain temperature stability
as high as 80°C. The high-temperature sample heaters will maintain
temperature stability as high as 100°C.