Hardy HI 1769-2WS - Manual (Page 73)

CHAPTER 6 - Troubleshooting
6-7
Mechanical Stability
and Configuration
Settings See Figure 6-5
FIG. 6-5 MECHANICAL STABILITY AND CONFIGURATION SETTINGS
Mechanical Stability
Vessel -
When inpspecting 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-loadin.
Make sure 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 load cell mounts are mechanically stable and fixed.
Large changes in individual load cells indicate a shift in COG or faulty load cells.
Piping and motors will effect effect the individual load cell readings.
Allow for a higher reading on load cells 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.
Configuration Settings
Incorrect WAVERSAVER settings can cause unstable weight readings
Repeatability -
Divide the total load cell capacity, including decimal points, by load cell divisions,
1,000 to 10,000
Resolution -
Divide the total load cell capacity, including decimal points by 30,000
(The amount you can expect to see, but not necessarily stable)
B2
Stable?
B2
Stable?
Contact
Hardy Instruments
Service Center
Yes
No
Yes
No