Calibration
3-10 P/N M/97-520
Single Range Viscometer Span Calibration
In this procedure, a calibration bar will be used to simulate torque the
torsion element will encounter during single range measurement of your
specific process fluid. Span calibration allows the torque sensor
electronics to be adjusted for the specific range gain in milliamperes from
the no torque or (zero point) set at 4.00 mA through 20.00 mA with the
calibration bar applied.
CAUTION
The internal components of the viscometer must be empty of process fluid,
clean, and free of obstructions before it can be calibrated. Refer to Section
5 - Maintenance and perform the appropriate cleaning procedure for the
process fluid application.
NOTE: This procedure must be performed before process fluid is
introduced into the viscometer.
NOTE: The value of the calibration bar is determined by viscosity range,
torque range, and the geometry of the cylinders and should not be
considered to represent full scale.
NOTE: Refer to the range information within the Viscosity & Calibration
Data on the Viscometer Specification Sheet, that came with your
viscometer, for the appropriate single range calibration information to be
used for this calibration procedure.
NOTE: Refer to Figure 3-4 for torque sensor circuit board component
locations.
1. Turn power OFF to the motor controls and torque sensor
electronics enclosure and remove the cover.
2. Remove the sensing endcap from the viscometer as follows:
CAUTION
Handle the sensing endcap assembly with care when removing it from the
measuring chamber. Damage to the torsion element may result by
contacting the stator with the rotor.
a. Remove seven of the eight screws that secure the sensing
endcap to the measuring chamber.
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