Why is my HI 1746WS weight reading double?

There are a few reasons why your weight reading could be double what you expect it to be.

1. If the module was reporting lbs instead of kg, then it would be pretty close to double. Check the input table, word 15, bit 2. If this bit is on, then you are reading lbs.

2. If the weight MULTIPLIER (word 15 of the output table) is incorrect.  The HI 1746WS module uses the multiplier to determine the data type and resolution for the values sent to the processor.

When the weight MULTIPLIER is set to "0" (zero), the module will transfer data in IEEE floating point type format. The user would need to move this to a float register for correct reading.

When the weight MULTIPLIER is set to a non-zero value, the module will multiply the reading by the multiplier and send this in an integer type format. The user would then need to divide the value by the multiplier to return the reading to normal.

3. The test weights used during calibration need to match the span value. If these do not match, then the weight readings will be incorrect.

Troubleshooting tips:

1. If there are multiple modules, swap the load cell system from one working module to the incorrect reading module. Do a calibration and see if the problem follows the module or the load cells.

2. If possible, swap two modules in the chassis. See if it follows the module or the chassis location.

If it follows the load cell system, then there is a problem with the match between the load cell and the C2® data chips. If it follows the module, regardless of which load cells and which slot it is in, then the module is bad. If it follows the slot position, then it is a programming situation.