Why is scale calibration needed?
Scale calibration is needed to ensure that you are weighing ingredients or items accurately in order to produce consistent and quality products.
Changes to the environment such as the temperature,humidity, barometric pressure, exposure to dust or dirt, and/or any sudden shock to the weighing scale could damage the scale, whether that be the outer casing, the display or the load cells, which in turn could compromise the accuracy of the scale when weighing.
Scale calibration tests ensure that weighing equipment is accurate and performing correctly giving manufacturers and consumers confidence in the quality and consistency of products.
During calibration, the measurement values obtained from the instrument are referenced against test weights traceable to national and international weighing standards. The readings obtained are documented, which is important because this helps to identify any products that may have been affected by incorrect process weight readings, enabling corrective action to be taken.
The scale is then adjusted to ensure it is within defined tolerances, and the calibration is then repeated with after adjustment readings.
The completed certificate is then issued for records and peace of mind.
How often should scales be calibrated?
It depends on a number of factors including your processes and procedures. If your weighing scale is in frequent use, it’s likely to need calibrating sooner than a scale that is only used a couple of times per day.
Drift analysis is also recommended to assist in determining calibration frequency. By recording the drift over time, trends can be identified and calibration frequency can then be set to minimise business risk.
If you’re unsure about this, a member of the Stevens Traceability service team will be able to advise you.
How do you know if your scale is calibrated?
When purchasing a weighing scale from Stevens, you can choose to have your scale calibrated by one of our experts and a calibration certificate is provided. We also label our equipment when it’s been calibrated on-site so you can quickly check that the scale has been calibrated.
If you have weighing equipment on-site which you’re not sure about, typical signs that it needs calibrating are inaccurate weighing results. Sample testing some products will allow you to identify if this is the case.
Other reasons you may need calibration
- You may have a new scale
- Your existing scale may have been repaired
- If your scale has been relocated.
- If your scale has physical damage
- Change in ambient conditions.