Solis Precision Weighing

 Solis: Precision weighing results for almost any lab application

Adam Equipment’s extensive product line up offers intuitive operation, precision accuracy and dependable performance to make any weighing process more straightforward than  ever. Their core focus is quality and reliability, to ensure that every Adam scale or balance purchased can be trusted to provide steadfast results with every use.

Solis Precision Balances

An ideal choice for research and quality assurance labs

The Solis precision balance features a high-resolution graphic display, precision counting functions, and ability to store up to 99 ingredients. Choose from 11 different models that offer internal or external calibration, capacities from 360g to 3200g, and readabilities from 0.001g to 0.01g

Weighing Units

g, mg, lb, oz, ct, GN, dwt, mm, ozt, T, tl.H, tl.S, tl.T, custom unit.

Features and Benefits

• High-resolution graphic display is amply sized for clear visibility
• Level indicator and adjustable feet ensure proper balance setup for optimum weighing results
• Large, grade 304 stainless steel pan allows easy cleaning
• RS-232 interface provides speedy connection to computers and printers
• AC adapter included
• External calibration allows for verification and adjustment with weights
• Selectable digital filtering helps minimise effects of vibration and disturbances
• Printouts include date and time for data tracking within Good Laboratory Practices (GLP) guidelines
• Multilingual display allows use in many different countries
• Checkweighing with audible alarm
• Parts counting with preset sample sizes
• Security slot for optional lock and cable to help prevent theft
• A 5-year warranty means quality assured for years of use

Easy to navigate menus

With a high-resolution graphic display and intuitive features, Solis precision balances provide an outstanding solution for labs everywhere. The Solis is ideal for research and quality assurance labs; science education; precision counting; and production and manufacturing applications needing precision results. Users can readily view the comprehensive data on the amply sized graphic display. A multilingual display capability permits use of the balance in various regions, while recognisable icons help the weighing process flow smoothly. Formulation is simplified, as the Solis stores up to 99 ingredients.

Data tracking – Printouts include date and time for data tracking within Good Laboratory Practice (GLP) guidelines

Also featured on the flyer are Solis SAB Analytical and Semi-Micro Balances

These Solis models offer capacities from 120g to 510g and readabilities from 0.01mg/ 0.1mg to 0.0001g.

Many more features.  Download the flyer on our website, select your model and request a quote!

Traceability and Uncertainty

Traceability & Uncertainty

 

Quote by Lord Kelvin on the importance of measurement 

Introduction

Measurement today is more valuable than ever. We depend on measurement for almost everything - from time keeping to weather forecasts, from DIY work at home to heavy-duty manufacturing, industrial research and medical science.
Since measurement plays such a fundamental part in our lives, it is important that the accuracy of the measurement is fit for purpose, i.e. it fully meets the requirements of the application. Every measurement is inexact and therefore requires a statement of uncertainty to quantify that inexactness. The uncertainty of a measurement is the doubt that exists about the result of any measurement.
One way of ensuring that your measurements are accurate is by tracing them back to national standards. This method of guaranteeing a measurement's accuracy through an unbroken chain of reference is called traceability.

Scientist with scales 

Accurate Measurement

Accurate measurement enables us to:

• Maintain quality control during production processes
• Comply with and enforce laws and regulations
• Undertake research and development
• Calibrate instruments and achieve traceability to a national measurement standard
• Develop, maintain and compare national and international measurement standards

Successful measurement depends on the following:

• Accurate instruments
• Traceability to national standards
• An understanding of uncertainty
• Application of good measurement practice

There are many factors that can cause inaccuracy:

• Environmental effects
• Inferior measuring equipment
• Poor measuring techniques

 

Ruler melting in the sun

Inferior measuring equipment

Poor measurement techniques

In the United Kingdom, the National Measurement System (NMS) is in place to enable measurements to be traced back to their national standards. As the UK's national standards laboratory, NPL is at the pinnacle of this system guaranteeing the accuracy of physical measurements for the nation and abroad.

What is Uncertainty?

No measurement is ever guaranteed to be perfect. Uncertainty of measurement is the doubt that exists about the result of any measurement. By quantifying the possible spread of measurements, we can say how confident we are about the result.

Explanation of the error vs uncertainty 

Expressing Uncertainty

A measurement result is only complete when accompanied by a statement of its uncertainty. A statement of uncertainty is required in order to decide if the result is adequate for its intended purpose and consistent with other similar results.
It does not matter how accurate a measuring instrument is considered to be, the measurements made will always be subject to a certain amount of uncertainty.
In order to express the uncertainty of a measurement, we need to evaluate as accurately as possible the errors associated with that particular measurement.
For example - we might say that a particular stick is 200 centimetres long, plus or minus 1 centimetre, at a 95% confidence level. This is written:

200 cm ±1 cm at a level of confidence of 95%

This means we are 95% sure that the length of the stick is between 199 centimetres and 201 centimetres.

Why does Uncertainty Matter?

Calculating and expressing uncertainty is important to anybody wishing to make good quality measurements.
It is also crucial where uncertainty can influence a pass or failure in a particular test, and must therefore be reported on a calibration certificate.
There are established rules for the evaluation of uncertainty. [More information can be found in NPL's Good Practice Guide (011) 'A Beginner's Guide to Uncertainty of Measurement'.] Of course, we must all make every effort to 'control' the uncertainty in our measurements. This is done by regular inspection and calibration of our instruments, careful calculation, good record-keeping.

                        Various accuracies 

What is Traceability?

Traceability is a method of ensuring that a measurement (even with its uncertainties) is an accurate representation of what it is trying to measure.

What is Traceability to National Standards?

The simple and basic concept behind calibration is that measuring equipment should be tested against a standard of higher accuracy.
It should be possible to demonstrate an unbroken chain of comparisons that ends at a national standards body such as NPL. This demonstrable linkage to national standards with known accuracy is called 'traceability'.
National standards laboratories such as NPL also routinely undertake international comparisons in order to establish worldwide consensus on the accepted value of fundamental measurement units.
Representatives of seventeen nations signed the Convention of the Metre (Convention du Mètre) on 20th May 1875 in Paris. This diplomatic treaty provided the foundations for the establishment of the Système International d'Unités (International System of Units, international abbreviation SI) in 1960. Since then, national standards laboratories have cooperated in the development of measurement standards that are traceable to the SI.
Any organisation can achieve traceability to national standards through the correct use of an appropriate traceable standard from NPL.

Who is Who in the Measurement World?

International Committee for Weights and MeasuresCIPM - Comité International des Poids et Mesures) the world's highest authority in the field of measurement science.
International Bureau of Weights and Measures(BIPM - Bureau International des Poids et Mesures) co-ordinating body for international metrology, based in Sèvres, France.
National Physical Laboratory(NPL) is the UK's national standards laboratory, a world-leading centre in the development and application of highly accurate measurement technology and material science.

What is the Difference Between ACCURACY and PRECISION?

The difference between accuracy and precision is illustrated below by 4 different archers… each with varying degree of ability. The bull's-eye in the target represents the true value of a measurement.
 

	Low accuracy and low precision (poor repeatability) Stone age man missed the bull's-eye and the 3 attempts were not near each other.
	Low accuracy but high precision Robin Hood's Merry Man missed the bull's-eye but the 3 attempts were near each other.
	Higher accuracy but low precision Native American's 3 attempts were near the bull's-eye, but were not near each other.
	High accuracy and high precisionOlympic archer hit the bull's-eye 3 times!

Accuracy is a qualitative term relating the mean of the measurements to the true value, while precision is representative of the spread of these measurements. Even when we are precise and accurate, there will still be some uncertainty in our measurements; the scientists challenges are to evaluate the uncertainty and make this as small as possible. When the uncertainty of a measurement is evaluated and stated, then the fitness of purpose for a particular application can be properly understood.

For more details and to download a poster with this information visit:-
http://www.npl.co.uk/educate-explore/factsheets/traceability-and-uncertainty/