Sofraser MIVI - Mounting Screws Torque; Grounding and Wiring; Checking the Equipment When Placed in the Process Line; Offset Adjustment in Air

MIVI Technical Manual
REF: 379/4 17
Protect the MIVI sensor against mechanical damages due to impact, pinching, crushing, twisting
and bending that aren’t covered by the warranty
2.3.9 Mounting screws torque
Torque at the mounting screws: 9 N.m  1 at the M6100 screws (4), or 21 N.m  1 at the M8 screws
(8 for the high pressure design), or 42 N.m  1 at the M10 screws (8 for the very high pressure
design).
2.3.10 Grounding and wiring
The MIVI sensor and the electronic devices must be connected to a good earth ground at same
voltage level. Use the screw dedicated to the grounding that is implemented on the MIVI
sensor.
2.4 Checking the equipment when placed in the process line
Before starting the process, check that the viscosity information is stable (vibrating rod in the air).
If not, check first the strength of the sensor fitting. Otherwise rotate the sensor of 90° (4 pos-
sible positions). Choose the position where the information is the most stable. Locate this
position in order to restore it when the sensor is removed and reinstalled.
Adjust the mounting offset, at room temperature. The rod is vibrating in the air.
2.5 Offset adjustment in air
The offset of the raw signal must be performed before utilization and introducing fluid in the pro-
cess. This is a mandatory step to ensure the reliability of the measure.
The clean and dry rod must vibrate in the air since at least half an hour before the offset adjustment
is carried out, in order to warrant the homogeneity and the stability of the MIVI temperature
on its mounting accessory (best at ambient temperature). Refer to the manual of the elec-
tronics for the detailed instructions.
The amplitude, corrected with an offset, is shifted so that the viscosity value is 0.00 cP.
When offset is confirmed, write it down as well as the raw values (see electronics manual) in the
follow up file of your instrument.
2.6 Refence point
When possible, note the viscosity information and raw values when a cleaning or rinsing solution
is flowing.
Beside of the condition “in the air”, this can be used as reference for some periodic controls of the
equipment. The operation must be done each time in the same conditions (rod in the air, or
in the cleaning solution). Such a control can be assimilated to a self-checking. If the original
calibration has been modified, the reference values will of course be those obtained with the
new calibration.