INCORRECT OUTPUT
If the output of the sensor is incorrect when applying a known load, check the following points to troubleshoot the sensor.
Is there any sign of damage to the load cell?
Any damage to the load cell can lead to an incorrect output or even
no output at all. Carefully check the load cell to make sure no
damage has been done. Examples of possible ways the load cell
can be damaged are listed here:
• Overloading
• Fractures
• Collapsed
Is the cover making contact with the load cell?
If the cover is touching the active end of the load cell, it could affect
the accuracy of the output. The active end of the load cell is defined
as the end where the load is applied, or the top in reference to the
label (see installation guide). Make sure the cover is not pinched in
or making any contact with the inside of the load cell.
Is the sensor hot?
An excessively high excitation voltage will heat up the sensor. This
may damage the sensor’s bridge. Check the excitation voltage to
make sure it is set properly.
Is the bridge resistance correct?
Check the resistance bE and –E to make sure it is correct
compared to the value on the infosheet.
http://www.futek.com/
files/pdf/Product%20Drawings/lsb200.pdf
Have any of the settings on the instrument changed?
Check the instrument that the load cell is connected to, to make
sure the settings have been set correctly and nothing has been
changed unintentionally.
Has there been any power surge to the instrument?
A power surge to the instrument may damage it leading to incorrect
readings of the signal from the load cell.
Has the load cell been subjected to any type of water or spray?
If the load cell has been in contact with any conductive fluids, the
bridge may be subject to short circuiting. Make sure to work in a dry
environment to prevent short circuiting.
Is the load cell in a dusty or harsh environment?
If the load cell is being used in dirty or harsh environments, there
could be residual build up on the load cell or in the overload
protection cutout that may prevent the load cell from being loaded
properly. Keep the load cell in a clean environment for optimal
performance.
Has the load cell been subjected to a high change
in temperature?
The LSB200 has a temp. shift zero of ±0.01% of R.O./°F, and a
temp. shift span of ±0.02% of Load/°F. If the temperature in the
testing environment has a high fluctuation, this may lead to unstable
readings. To get stable readings, keep the load cell in an environ-
ment with a steady temperature.
Is the load cell properly aligned/mounted to the fixture?
Misaligning the load cell can cause an off center load. For accurate
readings, make sure the load cell is properly mounted.
Has the sensor been damaged during installation or handling?
Make sure to follow the installation guide to prevent any damage to
the sensor. Also make sure to handle the sensor with care. The lower
the capacity, the more susceptible the sensor is to being damaged.
A D V A N C E D S E N S O R T E C H N O L O G Y , I N C .
FUTEK
ADVANCED SENSOR TECHNOLOGY, INC.
LSB200 MANUAL
www.futek.com
10 Thomas, Irvine, CA 92618 USA · (949) 465-0900
EM1007 · 5
TROUBLESHOOTING GUIDE
Via Paolo Uccello 4 - 20148 Milano
Tel +39 02 48 009 757 Fax +39 02 48 002 070 [email protected] www.dspmindustria.it