Calibration
3-18 P/N M/97-520
Coarse Zero Calibration
CAUTION
If the sensing endcap has been disassembled, then Coarse Zero
Calibration must be checked before fine zero voltage calibration can
occur. Failure to check the coarse zero calibration may cause problems
with fine zero voltage calibration. If the sensing endcap has not been disas-
sembled, then fine zero voltage calibration can be performed without
checking the coarse zero calibration.
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.
1. Turn power OFF to the motor controls and torque sensor
electronics enclosure.
2. Remove the Microsyn housing cover as follows:
a. Using a wrench, loosen and remove the signal cable strain
relief nut. Slide the nut, ring, and insulator down the cable.
b. Remove the screws from the Microsyn housing cover.
c. Rotate and lift the housing cover off the assembly and slide
it down the cable.
3. Open the cover to the torque sensor electronics enclosure.
4. Connect a range jumper wire between J2-Pin 1 and J2-Pin 3
(HIGH range).
5. Set R31 to its mid point position (approximately 7.5 turns).
6. Turn power ON to the torque sensor electronics enclosure.
7. 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 2.
d. Connect the second wire to J1-Pin 4.
8. Set the DVM to the 0 - 10 VDC scale.
9. Connect the DVM positive lead to the wire installed on J1-Pin 4.
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