CALIBRATION OF WEIGHBRIDGE

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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

Standard Weights

Calibration Weights for precision value

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Calibration Weights

Re: Hanger and slotted Weights for Torsional stiffness set up Bigger size cycloids

From: Moses David Francis Samuel <fmosesdavid@eppinger-gears.com> on Fri, 02 Sep 2022 17:26:56 Add to address bookTo: You | See Details

Hello Mr. Singhania ,

Good day , Just today I have received the Orders slotted weights and hangers .

I was not in a comfortable position till I open the packages, even with your confident communication due to my worst experience with other suppliers.

On opening the package I was extremely satisfied , as the packaging , the marking , painting finish and the quality was 100% beyond expectation .

Really appreciate the workmanship and you kept you word in maintaining Quality at its best .

Much impressed and looking forward for more business with you. I would love to recommend you to fellow industry people.

Regards / Mit freundlichen Grüßen

Moses David F

Asst.Manager Gearbox Assembly

Eppinger Tooling Asia Pvt Ltd

SF No 345/2A-2B ,Kondampatty Village ,

KinathuKadavu,Pollachi Taluk,

Coimbatore 641202

Tel :         +91 4259-201148

Mobile : +91 73977 85848

Mail:        fmosesdavid@eppinger-gears.com

 Web:       www.eppinger.de

Calibration Weights

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Dear Sir/Madam,

I am proud to be linked with you.


We, produce exclusively Cast Iron Weights since 1961. OIML appreciated our Weights in 1973. OIML recognized us as one of the supplier of Cast Iron Weights in their Guides (G 12 – Suppliers of verification equipment) published in Mars, 1987.


Manufacturing Cast Iron Weights as per OIML Recommendation is our specialty. We also manufacture as per design of buyer. Our range is 50g to 1000kg and 4-oz to 3000lb in all accuracy class.

We maintain quality of our products strictly as per International Standards with guaranteed accuracy. Our major production is being consumed by buyers from Germany, Canada, France, Australia, Netherlands, Belgium, U.K., Qatar, Dubai, South Africa, Ireland, Cyprus, Tanzania etc. etc.

Our Calibration Laboratory is accredited in accordance with ISO/IEC 17025:2017.

For our full activity you may see our url https://www.weights-swpi.com

Long term relation is our objective.

Kind regards,


Surendra Singhania

Shanker Wire Products Industries

DEOGHAR – 814112  (Jharkhand) INDIA

Mob: +91 9386142223

E.mail swpi@rediffmail.com

Cast Iron Slotted Calibration Weights & Hangers – M1 Accuracy

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The  hanger weight is a weight in itself, that also has its weight Calibrated so that the hanger can be used as part of the overall weight under test,  and will hold a number of Cast Iron slotted weights depending on its usable shaft lengths. The slotted weights are discs with slots in them and are designed to sit on the hanger. Several Cast Iron Slotted Weights may be used together to build up from a minimum weight to a maximum test load.

These weights are used to test force gauges, crane scales or other suspended weighing scales. Cast Iron Slotted Weights are primarily used to calibrate large capacity scales.

Shanker Wire Cast Iron Slotted Weights are manufactured from a high quality iron. The surface are free of cracks, pits and sharp edges. All surfaces are smooth and free of scratches, dents and pores. Weights are protected by a durable coat of paint to protect the casting from rusting.

The M1 Cast Iron slotted hanger weights (Newton Cast Iron Slotted Weights, Kilogram Cast Iron Slotted Weights)  are the most common hanger weights we sell and are suitable for testing and calibration in the 5 N / 500 g up to 200 N / 20 kg.

Cast Iron Slotted Weight Hangers:

Cast Iron Slotted Weights are typically used with a hanger that also has its weight calibrated so the hanger can be used as part of the overall weight under test. Weight hangers are available in a variety of lengths and weight capacities. Hangers are calibrated to a mass value, and also have a capacity of how much weight can be loaded onto them.

Calibration Weight Certification:

You will normally need a calibration certificate to satisfy, if the tests that you do are on equipment that can effect the quality of your product and you are audited by an outside organization. Our Calibration Laboratory is NABL accredited in accordance with the standard ISO/IEC 17025 : 2017, So you can be satisfied with the quality and accuracy of the Cast Iron Newton Slotted Weights and Hangers.

Construction and General Shape:

Cast Iron Slotted Weights have adjusting cavities. Each weight has its nominal value cast into the topside of the weight. Weights are protected by a durable coat of paint to protect the casting from rusting.

Click here to enquire about Cast Iron slotted Weights and Hanger:

https://www.slotterweight.com

Newton Weights

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A newton is defined as 1 kg⋅m/s2 (it is a derived unit which is defined in terms of the SI base units). One newton is therefore the force needed to accelerate one kilogram of mass at the rate of one metre per second squared in the direction of the applied force. The units “metre per second squared” can be understood as a change in velocity per time, i.e. an increase of velocity by 1 metre per second every second.

In 1946, Conférence Générale des Poids et Mesures (CGPM) Resolution 2 standardized the unit of force in the MKS system of units to be the amount needed to accelerate 1 kilogram of mass at the rate of 1 metre per second squared. In 1948, the 9th CGPM Resolution 7 adopted the name newton for this force. The MKS system then became the blueprint for today’s SI system of units. The newton thus became the standard unit of force in the International System of Units.

The newton is named after Isaac Newton. As with every SI unit named for a person, its symbol starts with an upper case letter (N), but when written in full it follows the rules for capitalisation of a common noun; i.e., “newton” becomes capitalised at the beginning of a sentence and in titles, but is otherwise in lower case.

In more formal terms, Newton’s second law of motion states that the force exerted on an object is directly proportional to the acceleration hence acquired by that object, namely: F = m a , {displaystyle F=ma,}

Where m represents mass of the object undergoing an acceleration a. As a result the Newton may defined in terms of kilograms as 1 N = 1 kg ⋅ m s 2

{displaystyle 1 {text{N}}=1 {frac {{text{kg}}cdot {text{m}}}{{text{s}}^{2}}}.}

Examples

At average gravity on Earth (conventionally, g = 9.80665 m/s2), a kilogram mass exerts a force of about 9.8 newtons. An average-sized apple exerts about one newton of force, which we measure as the apple’s weight. 1 N = 0.10197 kg × 9.80665 m/s2    (0.10197 kg = 101.97 g).

The weight of an average adult exerts a force of about 608 N. 608 N = 62 kg × 9.80665 m/s2 (where 62 kg is the world average adult mass).

To enquire about Newton Slotted Weights follow the link:

https://www.weights-swpi.com/contact/

Metrication in Weighing & Measuring System in India

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WEIGHTS play a vital role in the Society. Normally we use it to judge the cost of products while selling or buying. During the ancient period transactions of commodities were being made either through the “Exchange” or “Barter” system which failed to satisfy the need of a common man of the Society. It laid down the foundation of a system of weighment and measurement. But every social structure/Elaka (region) period gave rise to their own system throughout the whole world which could satisfy their local needs to some extent only but failed to cope up with inter-regional/ inter-state or international trade as the world was coming closer very fastly.

The French Scientists encouraged by the revolution; assigned themselves to the task of evolving a system using nature as model and natural phenomena as guide to discourage the national/regional susceptibilities, if any. The credit goes to Talleyrand, that in 1790, the French Constituent Assembly took the initiative and entrusted the uphill task of establishing a Weighing/Measuring unit/system which may have global acceptance.

After careful examination of various reports submitted by groups of leading scientists of that era, 1/10th million part of a quadrant of the earth’s meridian was adopted as the unit of length “The Metre”. The unit of mass was derived from this unit of length by defining a “Kilogram” as equal to the mass of water at its freezing point having a volume of a decimetre (1/10th of a metre) cube.

Based on the conclusions of aforesaid observations, two physical prototype Standards of Platinum one for ‘Metre’ and other for “Kilogram” were constructed and deposited in the Archives of the French Re public in 1799. Despite the fact that the “Metric System” was the most scientific and its fractions & multiples were based on decimal system, it could not get wide range acceptance by all the advanced countries due to their own socio-political reasons. Many learned scientists of France as well as other European Countries advocated and raised their voice in favour of a uniform measuring system based on “Metric System”, the system remain dormant for several years.

In 1870 the French Government took the initiative and organized a convention in Paris which was attended by 15 countries. In 1872 another convention was held with the participation of delegates from 30 countries, 11 of whom were from American continent. Finally on 20th May 1875 a “Convention du Metre” was signed by 18 countries. The signatory states not only bound themselves with the adoption of Metric system but agreed to form a permanent scientific body at Paris. Thus Bureau International des poidsetmeansures (BIPM) came into existence. So manifest were its advantages that by 1900 as many as 38 countries adopted this system in principle. This figure was doubled in the following fifty years.

Despite having all the positive aspect this “Metric System” could not be conceived and encouraged by the then “British Rulers” of India, rather they encouraged the “Zamindars” the local rulers to develop their own system of weighment and measurement. This was nothing but the famous “Divide & Rule” policy which kept these so called local rulers separate and discourage them coming on a common platform with a common uniform sense of understanding

But this phase could not last long. The interim Govt. adopted a resolution (Resolution No. 0-1-Std (4) 45 dt. 3rd Sept. 1946) which laid the foundation of National Standards Body. The purpose of this body was “to consider and recommend to Govt. of India National Standards for the measurement of length, weight, volume and energy”.

Indian Standard Institute started functioning in June 1947. Dr. Verman, the then Director of the Institute prepared a report in which he advised to adopt the Metric System and its fractions and multiples with Indian nomenclature. Just after independence a sample survey was con ducted which revealed that at least 150 different types of weight system were in use in different parts of the country Strange to note that most of these weights were having the same nomenclature but differ in actual weight markedly For example more than 100 types of “mounds” were in use ranging from 280 “tolas” to 8320 “tolas” a piece in Weight as compared to the standard mound of 3200 tolas. This system was traditional bound and not only exploiting the illiterate people but also encouraging the way to certain known malpractices. For instance, while buying the products from the producers they use the “Seer/mound” of higher weight value where as a lower weight value of Seer/mound were used while delivering these things to the consumers. In both the cases the powerful “Trader body” was benefited. It was felt by our national leaders that unless an uniform scientific system of weighment  & measurement is adopted the interest of the producers as well as consumers cannot be fully protected which was essential for the sound economic growth of the society and the country as a whole.

To implement the uphill task for introducing a systematic and uniform way of weighment and measurement, a Central Metric Committee was constituted under the chairmanship of Union Ministry of Commerce and Industry with several Central Govt. dept., State Govt. Scientists Technocrats, representatives from trade and industry as well as ordinary consumers as its members

After several meetings, marathon discussion and taking several aspects and arguments of different participants in consideration, the “Metric System” came into effect. A resolution was passed by both the houses of Parliament. On 28th December, 1956, it got consent of the President of India with the remarks that “An Uniform System of Weighing & Measuring in metric be introduced throughout all the states and union territories of India”

The Indian Standards Institute was entrusted to prepare the Standards of Weights & Measures & the Indian Weights & Measures Act 1956 was promulgated with the following preamble

i) To use an uniform system of Weights &Measures.

ii) To make greater order and efficiency in economic management like industrial production, trade and even in running a household.

ii) To fully protect the interest of producers and consumers.

iv) To develop trade with other countries of world.

v) To put the country on the map of matriculation in the world.

A sufficient number of enforcing officers were recruited and trained at ILM, as per provisions of the Act for better and uniform implementation of Metric system.

We are Manufacturer- Exporter of Standard Weights, Roller Weights, Cylindrical Weights, Slotted Weights, Test Weights ranging from 1 mg to 1000 kg in all accuracy classes.

Contact us here: http://www.weights-swpi.com/contact/