How to Check for a Bad Load Cell
Load cells are an important component of digital scale systems. These cells serve as force sensors, measuring the amount of force exerted on them via voltage signals produced from a regulated power source. These signals are converted by the digital indicator into numeric values that can be read with human eyes. A bad load cell that's physically damaged or adversely affected by corrosion or an out-of-range voltage output will produce a highly inaccurate scale reading, necessitating the cell's eventual repair or replacement.
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Instructions
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Visually inspect the load cells for any signs of deformation. If the cells are deformed, have them repaired or replaced by a trained service technician.
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Connect the load cell to the digital indicator. Make sure the terminals are connected properly to the load cell wires. Remove any corrosion and/or moisture from the connectors before performing the checks.
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Turn the indicator to the "On" position. Allow a few seconds for the readings to stabilize. After the readings have stabilized, press the "Zero" key to drop the reading to "0."
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Set the multi-meter to the 20 or 30VDC range and read the voltages between the 4 load cell connections. Do not check the shield connection, as it is not connected to any part of the load cell circuit. The red/black wires should give a reading of 8.000VDC, while the red/green and red/white wires should give a reading of 4.000VDC. The green/white wires should read 0.000VDC.
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Set the multi-meter to the "MV" range. Without a load, there should be a small signal between the green/white wires. At full capacity, the wires will give a reading of 24.00 mV. If any of the readings are outside of these tolerances, have the load cells repaired or replaced by a trained service technician.
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Tips & Warnings
Exercise caution when inspecting or testing electric components. Mishandling electric components could result in serious injury or death.
