Chapter: Maintenance
118 M10-17318-EN
Troubleshooting for Load Cells
Instron
®
load cells, in general, are electrically calibrated, self-identifying and
rationalized. Approximate resistances are given that can verify a possible broken gauge,
or a faulty connector or cable.
If a strain gauge in a cell has been badly overstressed, but still maintains its electrical
continuity, the cell may show a higher than normal amount of creep. If a gauge has
become improperly bonded due to degradation in use, the cell may exhibit a
combination of general instability in its balance point, together with a large amount of
creep. Difficulties of this sort rarely appear as an instability in the calibration of the cell.
If a load cell has been overloaded, the load-sensitive member may be permanently
deformed to the extent that the proper dimensional alignments inside the cell are no
longer maintained. For example, if the position of the central spindle is changed, this
can result in the balance point shifting abruptly as the cell is loaded or unloaded.
To check the load cell, substitute another cell to re-check the test results carefully. If
your results differ significantly from the original test results, then the original load cell
may be damaged. However, many of the symptoms described above can also arise from
a faulty load sensor conditioner, or possibly a mechanical adjustment.
If you suspect that a cell may be damaged, contact Instron
®
Service to arrange return of
the load cell for analysis and possible repair.
Ancillary parts
This section lists the ancillary parts that are included with the system upon delivery.
These components are either required to complete the installation, or facilitate setting
up load cells and accessories on the load frame. Keep these components in a safe
place.
Parts list
Table 10. Ancillary parts
Description
Part
Number Quantity Purpose
Cable tie hook and loop 11-10-1027 5 Cable management
Cable clip, 6-12 mm 11-6-60 3 Secures cables to the frame
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