Maintaining accurate weight data is critical for business of all sizes, whether you are small business which relies on accurate weight to sell products or a large cooperation which keeps all its employees and products to track, weighbridge calibration is essential.

In this blog post we’ll discuss about legal requirement, what is weighbridge calibration, process and requirements of weighbridge calibration.

Legal Requirement:

If you’re using your weighbridge for trade purposes, there is a legal requirement to ensure your weighbridge meets the stated accuracy (within certain tolerances) at all times.  Anyone operating a weighbridge would be strongly advised to have it calibrated every 12 months to ensure compliance.

If a weighbridge is not calibrated at regular interval, it will be inaccurate by a percentage. For example a weighbridge may be low by 50kg when a 1 tone weight is placed on the scales, but when 10 tones are placed on the scales it will not read 9950kg. Instead, it will read 9500kg because the scale is reading 5% too low.

What is weighbridge calibration:

Calibration is the process of ensuring that a measuring instrument’s performance matches the standard of known or traceable accuracy; the measurement error is the difference between the measured value (the reading) and the correct value (the reference weight).

A set of weights ranging from weight equal to maximum capacity of the weighing machine to weight equal to the minimum reading indicated by the weighing machine is placed on the weighing machine one by one and the reading is noted simultaneously. The change in indication of reading is noted simultaneously after placing each weight, from maximum to minimum.

Weights are again placed on the weighing machine, this time from minimum to maximum capacity and change in indication is noted. Indication error is calculated. Following the series of calculations uncertainty of the weighing machine is calculated.

Benefits of weighbridge calibration:

Weighbridge calibration is critical to achieve accurate weighing results. the life of your weighbridge and its weighing accuracy is greatly prolonged when combined with periodic calibration and frequent routine testing. 

Calibration performed by an authorized calibration provider using accurate reference standards ensures that the weight measurements will be accurate thus improving industrial process and therefore increases profitability.

Metrological requirements for reference standards used to calibrate the weighbridges:

The maximum permissible error of the Standard weight used to calibrate the weighing machine must not exceed one third of the maximum permissible error for the corresponding load considered on the weighing balance under verification. This is minimum requirement for calibration of the weighing balance.

The standard weight must be coated with materials suitable for providing protection against the corrosion.

Why chose our reference standards for calibration of weighbridges:

We here in Shanker Wire Products Industries (S.W.P.I.) produce 100 kg to 1000 kg high denominational weights as per OIML R 47, in all OIML accuracy class. Our Laboratory is NABL accredited in accordance with ISO/IEC 17025. We deliver NABL certificates of Calibration covering the basic reporting of conventional mass correction, uncertainty and traceability of standards.

Calibration Measurement Capability (CMC) of our 1000 kg weight is 6.102 g in M1 accuracy which is one of the best in India.

This standard weights are used for testing (and adjusting) of high capacity weighing machines in medium or ordinary accuracy class.

To find out more about our  standard weights Please get in touch

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