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At AML Instruments we offer a load cell calibration service at affordable prices with a fast turnaround time and fantastic customer service. We can calibrate almost all types of load cells, ranging from a few grams to 300 tonnes. So, if your load cell requires calibrating, please get in touch. During regular working hours, you can call or use our Live Chat, which is in the bottom right-hand corner of this website. Outside of the UK's regular working hours, you can get in touch by using our contact form. AML Instruments will have your load cells calibrated using UKAS calibrated calibration standards and we will issue a traceable calibration certificate. If it fails its calibration test, we can, with your authorisation, make adjustments or repair and re-test it where appropriate. In the event, you require new or replacement equipment we can help there. We have partnered with several manufacturers of force measuring equipment. We offer our calibration services either at our state of art laboratory or onsite.
Where you have several load cells or other force measuring equipment we can visit you. This ensures the very minimum downtime and alleviates the time and risk taken to ship expensive force measuring equipment.
Our engineers come equipped with industry-leading force calibration equipment that is capable of calibrating load cells and other force measuring equipment up to 50 tonnes. Our test frame is large (approx 1 tonne) however it has been designed with portability in mind. We can accommodate larger load cells to 300 tonnes back at our laboratory.
Onsite force calibration can work out very cost-effective when you have 5 or more load cells. This calibration service is available UK-wide and also in Europe.
To book your onsite load cell service, get in touch by Tel: 01522 789 375.
Of course, you are very welcome to send in your force measuring equipment to our lab. As standard we offer a 5-day turnaround there is an option for an express 24 / 48-hour calibration service. This express service needs to be pre-booked and the date agreed.
All measuring instruments lose accuracy over time and are prone to measurement errors. Heavy or miss-use may speed up the deterioration in a load cell system’s inaccuracy in its measurement system. Load cells can be physically bent or twisted by overloading off-centre loading.
With time and use, there is a difference between the value indicated at the sensor output and the actual value of a known load or force that will change.
Errors in measurement can be caused by several factors:
We, along with leading load cell manufacturers recommend a yearly calibration interval. However, when used in harsh environments or for critical measurements, then it will require calibrating more often. Likewise in some applications, a 24-month calibration period might be more appropriate.
We will provide a traceable calibration certificate with all equipment calibrated.
Our Force Calibration engineers have the experience and diligence to calibrate the vast range of load cells. Listed below are the types they commonly calibrate.
Compression Load Cells
Tension Load Cell
Compression/Tension Force Sensors
Load Measuring Pins
Link Load Cells
S Or Z Beam
Low Profile Force Sensor
Miniature Load Cells
Before starting the load cell calibration, an inspection of the mechanical & electrical systems and installation (where applicable) must be carried out.
Cables – Physically check the load cell cables and coil and protect them from damage
A master load cell is then put in line with the load cell being calibrated, however, it must be at least the same accuracy class or ideally three times more accurate than the accuracy expected from the calibrated system. For small capacity load cells a mass set is used.
A number of specialist adaptors are used to ensure perfect alignment of the force measuring device is calibrated and the calibration master in use. Misalignment errors can be very large and must be eliminated. The design of these adaptors is set out in ISO 376.
The load cell calibration procedure involves loading the load cell system in small increments and evaluating each output signal or displayed reading. Typically between 5 and 10 points are selected across the range of the load cell.
If the system is problematic, you could carry out the following four tests:
Mechanical Inspection – Check the load and cables for damage. If it is deformed, bent or stretched from its original shape, it will need replacing.
It is imperative a load cell cable is never shortened as this changes the resistance of the cable and therefore the accuracy of the load cell system. Any change in cable length would invalidate any calibration.
Electrically the connections must be clean and tight and corrosion must be removed again any change in resistance will mean inaccurate readings or outputs.
Zero Balance – Through overloading the load cell there could be a shift in the zero balance tolerance band. Using a voltmeter, measure the load cell’s output when there is no Force on the cell. It should be within the manufacturers’ tolerances of the specified zero output signal. If it is outside the zero-tolerance band, the load cell is damaged
Bridge Resistance – Measure the resistance of the input and output leads and compare them against the load cell specification. Any out-of-tolerance readings are caused by more than one element, typically due to an electric spike.
A load cell is a delicate precision measuring instrument, requiring careful handling and care to avoid damage. Below are AML Instrument’s recommendations for keeping your load cell in good working order between annual calibrations.
Since 1st Jan 12, the correct standard for calibrating force-proving instruments is ISO 376: 2011, replacing ISO 376:2004. Or ASTM E8 04. However many industrial force measuring systems are calibrated to the manufacturer’s specifications and maximum permissible errors.
AML Instruments are a full spectrum calibration company and are able to calibrate a vast range of testing equipment. Such as:
AML Instruments quality systems are certified to ISO 9001 by BSI and accredited to UKAS ISO 17025 click here for our current calibration scope.
If you would like more information or a quote for any of our services, please contact.
You could email us at [email protected]
Call us on Tel: 01522 789 375
Or use our enquiry form by clicking here.