Calibration
3-6 P/N M/97-520
Fine Zero Milliampere Calibration Test
The Fine Zero Milliampere Calibration Test should be performed after the
viscometer has been installed and before process fluid has been introduced
into the viscometer. This procedure ensures that the zero position of both
the Microsyn field coil assembly and the torque sensor electronics are
matched.
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: 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.
2. Open the cover to the torque sensor electronics enclosure.
3. Disconnect milliampere output cable from J1 Pins 1 and 2 on the
torque sensor electronics circuit board.
4. Perform the following steps to allow Digital Volt Meter (DVM)
connections to the torque sensor printed circuit board:
a. Cut two lengths of #18 - 24 AWG wire 6 inches long.
b. Strip approximately 1/8 inch of insulation off each end.
c. Connect the first wire to J1-Pin 1.
d. Connect the second wire to J1-Pin 2.
5. Set the Digital Volt Meter (DVM) to the 0 - 20.00 mA scale.
6. Connect the DVM positive lead to the wire installed on J1-Pin 1.
7. Connect the DVM negative lead to the wire installed on J1-Pin 2.
8. Turn power ON to the torque sensor electronics enclosure.
9. Adjust R18 (or the Remote Zero potentiometer if so equipped) until
the DVM indicates 4.00 mA.
NOTE: If 4.00 mA cannot be achieved, perform the Coarse Zero
Calibration procedure.
10. Turn power OFF to the torque sensor electronics enclosure.
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