Tuesday, 31 January 2017

Why those approach levels are important

Getting an axle weighbridge correctly calibrated is vital if the system is to provide accurate axle weights. But as the concrete approaches are so important to system accuracy, the calibration must be done on site.


Testing a system at the factory is a useful exercise to check that it works as a basic weighing machine, but it’s only when the system is installed in its final location that any problems caused by incorrect approach levels show up.

Which is why we have invested a significant sum in a purpose designed test vehicle specifically for calibrating axle weighbridges.

Every single Axtec axle weighbridge is tested on site using this unique facility. Thus every system gets a thorough test in its actual place of work and customers can be sure that both weighing system and approach levels are correct.

We normally suggest that an annual calibration is beneficial and we offer this testing facility to anyone who has an axle weighbridge.

It will starkly show up any issues.

Such was the case recently when we went to calibrate an axle weighbridge in the midlands. It was clear to the naked eye that the system had been poorly installed with no account taken of the existing concrete levels. With a roadway that sloped in two directions either side of a joint and the platform just installed with minimal construction work, the system was never going to accurately weigh a multi axle vehicle as intended.
Correct levels mean accurate vehicle weights.

Tests done with our specialist weighbridge test vehicle showed errors up to 1,450kg different to the  calibrated weight which meant that vehicles could be leaving the site seriously overloaded.
And all because the concrete approach levels were wrong.

No doubt the system was dead weight tested in the factory and almost certainly producing results within specification but failing to take account of the effects of the approach levels on a vehicles suspension meant that it would never be accurate on site.

The only course of action in this case is to lay correct approaches to ensure accurate weighing.

Sorting out a poor installation could be a costly business.

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