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Compliance · Free Excel template · Saudi Arabia

Axle weight sensor installation and calibration checklist

Fit a weight sensor to a tracked truck and prove its readings: a 34-step installation checklist, a four-point calibration log with slope, offset and the largest error, and a summary of progress.

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  • Axle and gross check
  • 34-step sensor checklist
  • Calibration with a pass mark
What's inside

What is inside the workbook?

Five sheets. Work through the checklist, then calibrate each axle sensor.

  1. 01

    Sensor checklist

    34 steps in six groups: choose, install, connect, calibrate, hand over and keep accurate.

  2. 02

    Calibration

    Four points per sensor, a least-squares line and the largest error against your tolerance.

  3. 03

    Summary

    Checklist progress and calibrations passed or failed.

  4. 04

    Lists

    The drop-down lists the other sheets use.

The sensor checklist

From the sensor to the tracker

The checklist has 34 steps. These four are the ones that go wrong most often on a wiring day. Wire colors on your sensor may differ: follow its datasheet.

  1. Mount the sensor as its datasheet shows

    Vehicle empty, on level ground, ignition off. Photograph the position.

  2. Power from a point the tracker notes allow

    Fit a fuse. Check the sensor supply voltage matches the vehicle, 12 V or 24 V.

    Power

  3. Ground and shield

    Connect the shield or earth wire only if the sensor datasheet asks for it.

    Ground

  4. Signal to a matching tracker input

    The tracker input must accept the sensor output type and range. Record which input serves which axle.

    Signal

How the calibration log works

A sensor sends a raw reading, such as volts or bar. To turn it into tonnes you weigh the axle at a weighbridge at four loads and record the raw reading each time. The sheet fits a straight line through the four points and shows how far each point is from it.

slope = (n·Σxy − Σx·Σy) ÷ (n·Σx² − (Σx)²) offset = (Σy − slope·Σx) ÷ n error at a point = |slope·x + offset − known weight| Pass = largest error ≤ your toleranceExample: raw 0.5 to 3.5 gives slope 3.11 t per unit, offset 1.455 t, largest error 0.13 tx is the raw reading, y the known weight in tonnes, n = 4.

The 0.3 t tolerance in the file is a typical value, not from a source. Use the tolerance your standard or client sets.

Limits of the file

It is a reference and a worksheet. It is not legal advice, it is not an official table, and it does not say that any product is approved for weight verification by the Authority.

Related Tracom solution

Load data from the axle itself

A weight sensor connected to a tracking device can report load with each position record. Tell us your axle count and suspension type and we will talk through which sensors and tracker inputs fit.

  • Weight sensors. Part of the Tracom sensor range, next to fuel and temperature.
  • Second-by-second data. Readings come with the position record.
  • Advanced configuration files. Keep the slope and offset with the device setup.
  • SCMS portal. Manage devices and configuration files in one place.
  • No claim about acceptance. The Authority decides which systems count.
Questions

Axle-load questions, answered

Planning weight sensors on a truck fleet? Talk to Tracom.

What does the checklist cover?

Choosing the sensor, fitting it, connecting it to the tracker, calibrating it, handing it over and keeping it accurate. 34 steps in six groups, with a status per vehicle.

Where do I get the known axle weights?

From a weighbridge or a weighing station ticket. Weigh the axle at four loads and type each ticket weight next to the raw reading.

Does a weight sensor on a tracker count as a verification method?

The Authority's announcement of 8 May 2025 (Saudi Press Agency) asks carriers to check truck weight by approved means. Press reports of it list tracking linked to weight measurement among them; we could not read that list in an official text on 3 Nov 2026. Which systems the Authority accepts is for it to say, and it publishes a list of licensed companies. Check yours there.

How many points should I use to calibrate?

The file uses four points per sensor and a straight-line fit. More points make the check stronger. Include a load near the limit, and set your own tolerance.

Can the file replace a weighbridge?

No. It records and compares. The calibration needs known weights from a weighbridge, and the checklist asks you to keep a ticket as proof.

What is Tracom's role here?

Tracom makes tracking devices and sensors. This file is a neutral worksheet for every truck operator. It makes no claim that a Tracom product is accepted by the Authority. Ask for the sensor and input datasheets before you buy.

Next step

Bring your truck configuration to Tracom

Share the axle count, the suspension type and the loads you carry. We will talk through sensors and tracker inputs.

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