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
If there is no output or the output isn’t changing when applying a load, check the following points to troubleshoot the sensor.
www.futek.com
10 Thomas, Irvine, CA 92618 USA · (949) 465-0900
EM1007 · 4
Is the sensor wired properly?
Make sure the power is applied between red and black, and the signal is
measured between green and white.
WC1: Standard 4-Wire
ZERO SHIFT
NO OUTPUT
If the zero has an offset before applying any load, check the following points to troubleshoot the sensor.
Is there any sign of damage to the cable?
Any damage to the cable can lead to discontinuity in the wire. Carefully check the cable
to make sure no damage has been done. If the cable will experience continuous flexing,
please consider a cable bend radius at least 10x the cable diameter for bend relief.
Examples of possible ways the cable can be damaged are listed here:
• Cuts/nicks
• Sharp bends
• Excessive twisting
• Too much tension
• Crushed under weight
Is the load cell mounted upside down?
The load cell has been calibrated in its optimal direction and has
taken into account the measurement end. Reference the label when
mounting the sensor. (see installation guide)
Does the sensor respond to a shunt?
A load can be simulated on the sensor through the use of an
external resistor connected on the –Signal and –Excitation wires.
Shunting can provide for a way to test a sensor’s functionality. Note
that a shunt is performed with no load on the sensor. You can find a
Shunt calculator online at http://www.futek.com/shuntcalc.aspx.
Is the sensor preloaded in either direction?
Having a preload, such as a fixture weight, on the sensor will create
an offset in the zero. This will reduce the load that can be applied. o
Ex. If a 10 lb sensor is mounted with 2 lb fixtures, the remaining
weight that can be applied is 8 lbs. Even if the instrument is tared to
zero, the sensor cannot take more than a 10 lb load.
Does the bridge need to be rebalanced?
The zero balance calculator can be used to compensate for this high
zero by selecting a resistor to be used as a zero shunt.
http://www.
futek.com/zerocalc.aspx
TROUBLESHOOTING GUIDE
Bridge Sensor
XXX
Ω
+ Excitation
(Red)
Shield
(Floating)
+ Signal
(Green/Yellow)
– Signal
(White)
– Excitation
(Black/Blue)
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