1. Inspect and clean beneath your floor scale.
Debris beneath your scale platform or around the load cells in the scale platform can cause errors in weight readings. For this reason, the easiest fix for floor scale issues is routine cleaning. This includes cleaning the area beneath your floor scale periodically.
Tips for successful floor scale cleaning in all environments:
- When cleaning beneath the platform, be careful not to move the load cell cables to a position where they could be pinched or cut during operation.
- Scale platform binding is indicated by non-repeatable weight readings. To avoid platform binding, ensure clearance around the platform so it can move freely.
Additional tips for cleaning your floor scale in washdown environments:
- Water damage is a common cause of failure in load cells with an IP rating lower than IP69K. Be sure to use IP69K cells when high pressure or steam cleaning is present.
- Use care with hot water washdowns for hermetically-sealed load cells. The hot water may not damage the load cells, but the elevated temperatures can cause incorrect readings until the scale cools to room temperature.
2. Check your load cells.
There are several load cell issues that can cause your scale’s display to not stay at zero. One possibility is that the load cell connection is faulty. If this is the case, check cable connections in the junction box and at the indicator.
If the connections are stable, the scale may contain overload screws which need to be readjusted per the manufacturer’s recommendation.
If your scale is consistently showing instability, your load cell cables may be pinched or cut. If this is the case, you may need to replace the load cell or homerun cable if they can’t be repaired.
3. Calibrate your scale after testing if needed.
After performing each of the above troubleshooting steps, test your scale and see if it needs to be calibrated. If calibration is necessary, refer to your indicator’s technical manual to determine the correct calibration procedure or contact your scale technician to perform a calibration. If your floor scale is being used in a Legal for Trade application, a certified technician must perform the calibration.
Reminders for successful floor scale calibration:
- Power up the indicator at least 20 minutes before starting the calibration to give the system time to warm up.
- Load the scale to near capacity two or three times before calibration is performed.
- With the scale base level and no load on the scale, place the indicator in calibration mode and perform a zero calibration according to the indicator manual.
- Place calibration weights that weigh 75% of the scale’s capacity on the platform.
- Perform a span calibration according to the indicator manual.
- Remove the weights and check the zero reading. Repeat the calibration process if necessary.