Model 640 & 640CC Instruction Manual
D01206676
Revision A February 2016
29
FILL the cylinder with oil and then verify pressure gauge readings at different
pressures. If optional software pressure display has been purchased pressure unit to
maximum typical operating pressure and input the digital calibrator gauge reading
into the HIGH VALUE of the software calibration screen. Be sure you are in the
correct units and SAVE HIGHVALUE. Next, release some pressure and verify the
CALIBRATED VALUE is correct. SAVE and depressurize/drain instrument.
Consistency Calibration Procedure
11.6
The consistency should be calibrated by using the consistency calibrator assembly.
The potentiometer mechanism and the digital meter, which indicates consistency,
should be calibrated by using the potentiometer mechanism calibrator. This device
applies a known torque to the potentiometer mechanism spring, allowing the
readout to be observed on the CALIBRATE CONSISTENCY screen (In TEST
SETUP of software program). Calibration of the potentiometer mechanism is
described in the example below.
1.
Set the calibrator near the front edge of the consistometer.
2.
Install the potentiometer mechanism to be calibrated on the holder. Insert the
wedge into the open slot nearest the potentiometer ground spring.
3.
Wind the cord around the potentiometer mechanism frame and over the pulley.
Place the hanger weight hook in the loop on the end of the cord.
4.
Install the alligator clips to the potentiometer mechanism springs matching the
wire colors to the contact pin wire colors.
5.
Insert the calibrator plug into the CALIBRATOR socket on the front panel of
the instrument.
6.
From the software IDLE screen, select INSTRUMENT SETUP and then select
CALIBRATE – CONSISTENCY.
7.
The weight of the hook on the string is 50g. This is an equivalent of 9 Bc. On
the touchscreen in the box labeled LOW DATA POINT input 9 on the
touchpad. Select SAVE LOW VALUE.
8.
Place 400g of weights on the weight hanger. This is the equivalent of 100
Bearden Units of Consistency (Bc). On the touchscreen in the box labeled
HIGH DATA POINT input 100 on the touchpad. Select SAVE HIGH
VALUE.
9.
The touch screen should indicate 100Bc in the CALIBRATED VALUE
display.
