Load Cell for Batching Plant

IMO your check for the load cell will stop at the end of the connection wires. Once you open the housing, you'll probably find a not repairable situation, unless you send it back to the factory. You might be lucky if the electronic board failed. Load cells have been manufactured according accurate production and technology standards and repair should be done accordingly. Did you contact the supplier for service at your place? Following his instructions would be your best bet.

You'll need to test it against a known reference cell.

I agree with the vagabond, there are no user serviceable components inside.

IF you have access to a resistance substitution box or a precision potentiometer you can make a substitute for the load cell input to the input card.This will tell if the cell is bad or the input needs recalibrating.

We use a different make but all should be similar. Maintainers jumper around each cell in turn. If the readout stability improves or there is no change whether the cell is in circuit or not, it is deemed bad and is replaced.

Units are non-repairable.

If you have four load cells doing the same job you should be able to tell which one is bad with this basic test.

Each load cell with zero load on it should produce more or less 0mV at Zero weight and 30 mV at capacity on the signal wires. Check the mV levels at no load, place a known load on the scale and check the values again. The problem load cell should become evident.

If the values on the damaged load cell are not too far off the correct readings you may be able to set and offset in the preamplifier if there's one present or if the signal goes into a plc analog input card you may be able to program an offset into the plc code.

If all of the readings are similar then the load cells are not likely the problem and you need to look elsewhere.

Good luck.

Elroy thank you very much sir.Can u please expalin further what you mean by set and offset in the preamplifier and program an offset into the card if it goes into a plc analog input.my has an LCD display screen and there is a reset button inside the unit.

I have a new thread on how to config the load cell,can u please check it out and let me know what u think?Thank you.

I am not familiar with your specific piece of equipment and as such am offering information based on experience, with the equipment I have worked on.

Some systems are set up with a pre-amplifier between the load cell and the readout. If your system is set up this way you can adjust the problem load cell output at the pre-amplifier by following the instructions provided by the manufacturer. The manufacturer should be able to supply you with the correct way to calibrate your system. The procedures are generally specific to each manufacturer.

If a PLC (programmable Logic Controller) is used in your system then there is an opportunity to program an offset into the PLC code.

Don't overlook the simple things to check for, such as loose or damaged cables or dirty connections. Make sure your excitation voltage is correct.

Find a manual for your equipment, or call in someone who is familiar with your specific system.

Remember when you are done you need to be certain that the system is reading accurately, or the readings are meaningless.

Good Luck