Hardy Instruments A Series, Руководство по эксплуатации и установке

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CHAPTER 7 - Troubleshooting
7-9
Mechanical Stability
and Configuration
Settings
See Figure 7-7
FIG. 7-7 MECHANICAL STABILITY AND CONFIGURATION SETTINGS
Mechanical Stability
Vessel -
When inspecting a vessel keep in mind, the Center of Gravity (COG) should be
low and centered equally over all the load cells.
Insure the load is directly over or under the load point to avoid side-loading.
Insure there isn't any side loading from piping or external forces.
Install flexures on all piping to insure a free floating vessel.
Insure the vessel and loadcell mounts are mechanically stable and fixed.
Large changes in individual Loadcells indicate a shift in COG orfaulty Loadcells.
Piping and motors will effect the individual loadcell readings.
Allow for a higher reading on Loadcells that support motors and piping.
Insure pneumatic lines are not applying pressure to the vessel when energized.
Use check (stay) rods to minimize vessel movement.
Insure the check rods are loose and not interacting with the vessel.
Power down all vibration, vacuum and pressurization equipment during the test
process.
B2
Configuration settings
Incorrect Waversaver settings can cause unstable weight readings
Adjust to the lowest WS setting that gives you a stable reading.
Higher frequencies with low amplitude vibrations; - Use WS settings 2 or 3
Low frequency with high amplitude vibrations; - Use WS setting 0 or 1.
Repeatability -
Divide the total loadcell capacity, including decimal points, by load cell divisions,
1,000 to 10,000.
(expected stable weight reading).
Resolution -
Divide the total loadcell capacity, including decimal points, by 30,000.
(The amount you can expect to see, but not necessarily stable)
B3
Stable ? No
Stable ?
No
Yes
Yes
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