TT100 In-Line Viscometer Installation, Operation, Maintenance and Service Instructions
P/N M/97-520 3-21
Fine Zero Voltage Calibration
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.
Fine Zero Voltage Calibration ensures that the zero voltage level has been
properly calibrated.
This procedure can be used to perform fine zero voltage adjustment once
the viscometer has been installed, or after a component requiring
calibration has been replaced.
1. Turn power OFF to the motor controls and torque sensor
electronics enclosure.
2. Open the cover to the torque sensor electronics enclosure.
3. 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.
4. Turn power ON to the torque sensor electronics enclosure.
5. Adjust R31 on the torque sensor printed circuit board to its mid-
point position (approximately 7.5 turns).
6. Connect the range jumper wire between J2-Pin 1 and J2-Pin 3
(HIGH range).
7. Set the digital volt meter (DVM) to the 0 - 10 VDC scale.
8. Connect the DVM positive lead to the wire on J1-Pin 4.
9. Connect the DVM negative lead to the wire on J1-Pin 2.
10. Adjust R31 until the DVM indicates 0 ±.005 VDC.
11. Remove the range jumper wire from J2-Pin 3 and connect it to
J2-Pin 2 (LOW range).
12. Verify the DVM indicates 0 ±.005 VDC. If not, adjust R31 to
0 ±.005 VDC.
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