Scale Calibration – UKAS Accredited
PRECISA UK SCALE CALIBRATION SERVICES
- Precisa are fully UKAS accredited to deliver calibration services
- Utilising fully-trained, experienced calibration engineers, we cover the UK (excluding Northern Ireland) and aim to respond within 48 hours to customer demands
- Offering a range of standard and bespoke calibration and maintenance services to all makes and models of balances, we provide a cost effective and professional service to meet all customers’ needs
- Upon request, we are happy to deliver Calibration Services at our service facility near Milton Keynes, Buckinghamshire
As an industry class-leader, in the manufacture of weighing equipment and delivery of calibration solutions, Precisa are committed to the pursuance of excellence and the delivery of world class services to our customers.
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Precisa are fully accredited to deliver calibration services. This accreditation complies with the requirements of all the relevant, regulatory bodies.
For the Sale, assembly, service, maintenance and calibration of Non-automatic Weighing Instruments and Associated Laboratory Equipment.
United Kingdom Accreditation Service (UKAS)
Accredited in Accordance with the Recognised International Standard ISO 17025:2005, General Requirements for the Competence of Testing and Calibration Laboratories.
|1||Service Only/Clean & Calibration||Service, clean and calibration check on balance. Ideal for schools, universities etc. Where certification not required.|
|4||ISO As Found & Post-service||Serice, calibration and adjustment to ISO procedures. As Found details balance condition prior to service & post service after adjustment and checks made. Certificate and ISO label affixed to balance.|
|5||UKAS AS Found & Post-service||Service, calibration and adjustment to ISO17025 (UKAS) procedures. As found details balance condition prior to service & post service after adjustments and checks made. Certificate electronically sent after verification by our UK office and UKAS label affixed to balance.|
|8||Checkweight Calibration||If customer uses checkweights, we can perform check of weight against our engineer’s certified weight sets.|
|9||Minimum Weight Check||Required primarily in Pharmaceutical industry and performed at the same time as calibration & service of balance|
|10||Verification/ Reverification||For trade purposes such as bullion, pharmacy & jewellery markets. In accordance with NAWI standards.|
|14||Workshop repairs||Utilising our large spares holding, we can perform in-house repair of most makes & models of balances.|
Precisa employ fully-trained, experienced scale calibration engineers, operating nationwide.
Precisa engineers are approved to verify weighing equipment as legal for trade.
Precisa offers a diverse selection of service packages to suit your needs and budget. These services can be tailored to meet the most demanding of requirements.
The industries we serve, include the pharmaceutical sector, hospitals, universities, schools and colleges, heavy and light industry sectors, construction and civil engineering.
What is Balance Calibration?
It is known that all cars need to be regularly maintained and periodically assessed for road worthiness. This is for the safety of the driver, other road users and means that the car is more likely to last longer as issues are identified early. Many people fail to realise that measuring instruments also need regular check-ups in order to operate to their full potential. Just like cars, regular wear and tear of balances means that their reliability can diminish and inaccurate readings can occur. Humidity, barometric pressure, seasonal temperature changes and gravitational acceleration can cause inaccuracies over time which could lead to an incorrect balance reading.
This means that balances can only be accurate for a certain period of time. Time induced changes in measurements are inevitable, however they can be controlled by being corrected in a timely manner through weighing scale and balance calibration services.
Calibration is defined as an association between measurements and is is essential to achieve accurate weighing results. Calibration of balances is carried out to ensure that they are correctly displaying the correct measurement according to their countries standards. Standards vary from country to country and frequency of weighing scale calibration services varies from industry to industry, depending on requirements.
Why do you need Scale and Balance Calibration Services?
If a company neglects to calibrate their balances and scales, measurements become guesswork and the company runs the risk of being negligent. Balance Calibration is essential for a number of reasons;
- Inferior products may be sent to your customer which may damage reputation, endanger the customer and incur large costs to recall the product.
- Ensures adherence to countries standards and avoidance of fines, loss of business etc.
- Reduces costs from manufacturing errors
- Quality assurance is ensured as companies can get certified in calibration so they obtain an official accreditation by a regulatory body which shows processes are kept safe.
- Identification of aging equipment so that it can be replaced.
- Calibrating your scales may reduce the amount of end products that are rejected as a result of being outside accepted tolerances.
Weighing Scale & Balance Calibration Services Frequency
Frequency of scales and balance calibration needs depends on a number of factors;
- Value of the weighed product – as incorrectly weighed product may have to be disposed of, there needs to be more frequent weighing scale calibrations for products which have a high cost.
- Compliance – If your product does not meet weights and measurements legislation, your production may be shut down until you have remedied the situation.
- Frequency and weights of product used – If weights are used occasionally and light products are put on them, they will need less maintenance than frequent heavy use.
- Mobility of scales – if scales are frequently handled during relocations, damage may occur during movement, so more frequent scales calibration of scales would be necessary.
- Environment – Harsh temperatures and regular thorough cleaning of scales would result in more of a likelihood in inaccuracies in the scale.
Differences between Calibration and Adjustment
“Calibration“ and “adjustment” are often confused as being the same process. Although they both work to improve balance measurement accuracy and provide accurate balance readings, they differ in their procedures. Calibration is understanding how a scales behaves. Adjusting is the changing of this behaviour.
Calibration is a set of processes under controlled conditions, that show the relationship between the values of quantities using measurement and the corresponding values according to standards set. The standards output and accuracy are known which means the a measurement can be compared with a measurement from the instrument being calibrated. Calibration reports can be made which show whether or not the the balance passed or failed certain conditions.
Adjustment is the process of adjusting a measuring device so that it is in a state of performance suitable for its use. The amount of adjustment carried out can be determined by a “found calibration” which is a pre-adjustment calibrations which involved carrying out the first calibration, making the adjustment and then carrying out the second calibration.
Calibration is about establishing a relationship between a known value (the standard taken from test weights) and the measured value. The difference between these two values show how you understand the behaviour of the scales. If you place 1kg on the scales and the scales reads 2kg, then you can presume that by placing 5kg on the scales, it will read 10kg. This understanding of behaviour is calibration.
Calibration of a scales often does not require any adjustment if everything is running well. A “tolerance” is if the scales is measuring well enough to successfully complete the task, without being 100% precise. Tolerances are subject to change and can be set by customers and manufacturers
What is Measurement Uncertainty?
Measurement uncertainty is becoming increasingly emphasized in measurement communities. Measurement uncertainty is the “doubt” of measurements. Every measurement we make has some level of doubt so we need to assess how much “doubt” there is so we can establish how reliable the reading is. If the measurement uncertainty for a device is not know, then there is no point in taking a reading at all. Measurement uncertainty must be included in calibration certificates according to the ISO 17025 standard for assessing the competence of calibration and testing laboratories
Measurement uncertainties can stem from environmental factors, the measurement device, operator or procedure errors and many more. Error is not the same as uncertainty. Error is the difference between the device reading and the standard, but an error reading cannot be accurate until the measurement uncertainty is established.
Measurements must be repeatedly taken in order to establish what the typical deviation is. Calibrators must have valid traceability to national standards and attention must be paid to the calibration process’ total uncertainty before deciding to pass or fail performances.
Measurement uncertainty should be included in the calibration reading in order to enhance the understanding of the scales.
What is the difference between Internal Calibration and External Calibration?
External Calibration is a manual process. It involves using trade approved calibration weights. A wide variety of calibration weights are used to test the weight capacity and level of accuracy.The weights are placed on the scale and their reading is set as the standard. The purchasing and management of these weights is very important. Weights must be bought from a trusted source and preserved carefully to make sure they don’t gain or lose mass.
Internal Calibration is a more automatic process that does not involve calibration weight sets or manual user input. This is used for scales with built in calibration weights and some of these scales can even be programmed to calibrate at specific times.
In summary, external calibration is less expensive but takes up time and staff resources and both scales and weights need to be properly maintained. Scales with internal calibration functionality tend to be more expensive but they account for more environmental changes, such as movement, stability and temperature.
When deciding which option is best for you, you will need to assess your budget, your time resources, if weighing conditions frequently change and frequency of use.