Model 640 & 640CC Instruction Manual
D01206676
Revision A February 2016
27
Stopping a Thickening Time Test
11.2
The steps listed below are for experienced users who are familiar with
consistometer operation.
1.
Stop the test using the touch screen.
2.
Turn COOLING ON
3.
When temperature has cooled below 212F/100C, open the PRESSURE
RELEASE valve and set AIR EXHAUST on DUAL units.
4.
When the pressure is at zero, select DRAIN. This will blow the oil from the
pressure vessel into the oil reservoir. You will hear AIR escaping from the rear
of the instrument once the cylinder is empty of oil. At this point you must turn
the FILL/DRAIN switch to OFF.
5.
Open the RESERVOIR COOLING valve to cool the oil in the reservoir if
equipped and desired.
6.
When the cylinder is cool enough, remove the slurry from the slurry cup
before it sets and becomes too hard. Press the cement plug out from bottom to
top.
Slurry cups are tapered, with the large end at the top. This makes
it easier to press the cement plug out of the slurry cup..
Calibration
11.3
The potentiometer mechanism, thermocouple, and pressure transducer (optional)
should be recalibrated on a regular basis. It is recommended that the thermocouple
and pressure transducer (if so equipped) be calibrated at least annually and anytime
new thermocouples or pressure transducers are installed. The potentiometer
mechanism (pot mech) should be recalibrated whenever the spring, contact arm, or
resistor is adjusted or replaced. Higher operating temperatures generally require
more frequent recalibration.
If the instrument is within tolerance after several calibration checks,
extend the calibration interval. If it is out of tolerance, shorten the
interval.
