Model 422 & Model 422CC Instruction Manual
D01187869
Revision A, December 2015
23
9.
By removing weight from the hanger it is possible to verify the
CALIBRATED VALUE as shown below. If the values are correct,
calibration is complete. If the values are incorrect, repeat steps making
adjustments to potentiometer mechanism as required. Refer to Table 5-1 for
weight to Bc conversions for pot-mech.
By applying additional weights between 0 and 400g and plotting
consistency display as a function of applied weight, the linearity
of the potentiometer mechanism may be assessed.
Table 5-1 Consistency as a Function of Weight vs. Torque*
WEIGHT (g)
CONSISTENCY (Bc)
0
-4
50
9
100
22
150
35
200
48
250
61
300
74
350
87
400
100
* Based on the equation from API Specification 10A and Recommended Practice
RP10B-2
T = 78.2 + 20.02 x Bc
Where: T = Torque, expressed in gram centimeters (g cm)
Bc = slurry consistency, expressed in Bearden units
