Model 640 & 640CC Instruction Manual
D01206676
Revision A February 2016
24
Cooling Water Controls
10.3
The cooling water controls are used to cool the cylinder and oil reservoir at the
completion of a test. The Fann pressurized consistometers are optionally equipped
with an industry first: internal cooling coils in the oil reservoir for quick cooling of
the hydraulic oil and faster turnaround between tests. The cooling water controls
consist of a COOLING WATER switch and a RESERVOIR COOLING switch.
The COOLING WATER switch allows water to flow through the cooling jacket
surrounding the pressure vessel. This valve should be turned on at the completion
of a test to cool the pressure vessel. Alternatively, software can be used to cool the
cylinder automatically.
The RESERVOIR COOLING switch allows water to flow through the internal
cooling coils in the oil reservoir to cool the hydraulic oil. This valve may be
opened at the completion of a test to or it may be opened during a test if the oil in
the reservoir becomes too hot or if it is desired to keep the oil cool to reduce
turnaround time for the next test.
Other Electrical and Electronic Controls
10.4
Additional primary electrical/electronic controls may include the POWER,
HEATER, MOTOR, and TIMER switches, the pump controls, and motor speed
adjustments. The primary display is the touch screen. These controls are discussed
in detail below.
The switch labeled POWER controls electrical power to the entire instrument.
Nothing else is operable if this switch is not on. If available, switches labeled
HEATER and MOTOR can be used to disable power to the heater and motor.
Under normal conditions, these switches may be left in the ON position. Leaving
the HEATER switch ON will not heat the instrument unless a test is running. If
equipped with an external timer, a TIMER switch will enable the elapsed timer.
An optional MOTOR SPEED tachometer displays the rotational speed of the slurry
cup when the motor is running. The SPEED CONTROL potentiometer is used to
vary the speed between approximately 25 and 250 rpm.
The touch screen is used to control temperature and pressure or other parameters
when available. The screen will also display a plot of consistency and temperature,
pressure, etc. as a function of elapsed time. More in-depth explanation of the touch
screen capabilities may be found in section 6.
A thermocouple is plugged into the THERMOCOUPLE connector so the centerline
temperature of the slurry cup may be monitored. The CALIBRATOR socket
accepts any standard consistometer calibrator.
