Product Specifications

Part of Thermo Fisher Scientific

e l e m e n t a l a n a l y s i s

Charge CorrectionOften when charge additions are calculatedmanually, expensive, nearly pure materialsare used in the calculation as this providesa quicker and easier solution. However, byusing the OXSAS Charge Correction option,a lower cost and more accurate solutionwill be found, often in a shorter time thanwhen calculated manually. This providessome very useful operational benefits.

Charge Correction is used after asample from the charge to correct has beenanalyzed. Should this analysis be found tobe outside specification, then the ChargeCorrection can be calculated automatically.

Alternatively the user can choosewhether to carry out the calculation afterthe analysis or not.

In both cases, a report listing thematerials to be added, the specificationlimits and the expected final concentrationwill be displayed locally and can also besent to a display terminal or printer locatedwhere the materials are added.

ProceduresThe Charge Correction procedure can bestarted when element concentrations areoutside the specification limits. However tobe more confident that the resulting chargewill meet the specification limits, it ispossible to set tighter limits than thesespecification limits. The Charge Correctioncalculation will then be carried out, shouldthe concentration be outside these tighterlimits. Similarly, aim limits can be defined

Charge CorrectionOXSAS software option forThermo Scientific OES and XRF spectrometers

Charge Correction is an integratedoption of Thermo Scientific OXSAS.It calculates the weight ofmaterials to be added to a furnacecharge to bring an out ofspecification material within limits.

This Charge Correction procedureis cost optimized and will selectthe lowest cost mix of materialsthat should be added to the chargeto bring it within the specificationlimits.

The report can betailored at will

Live example helpingthe configuration

The charge report editor

OXSAS is the most modernanalytical software for ThermoScientific optical emission andwavelength dispersive X-rayfluorescence spectrometers

Product Specifications

which will be used as the target limits forthe correction calculation and they can alsobe set tighter than the correction limits toprovide an additional safety margin.

The charge correction steps

The charge correction procedure is basicallyexecuted in three stages:• Step1: All elements that are below the

Minimum Correction Limit will be broughtup between the Low Aim and theMaximum Correction Limit (Elements E1in the above figure).

• Step 2: If a dilution is necessary andallowed, then all elements, which are stillabove the Maximum Correction Limitbefore this dilution is applied, will bediluted in such a way that theirconcentrations are between the MinimumCorrection Limit and the High Aimconcentration (Elements E2).

• Step 3: All elements that lie initially, orbefore the dilution between the Minimumand Maximum Correction Limits arecorrected in such a way that they do notleave this range (Element E3).

The Charge Correction of OXSAScalculates the least amount of materials tobe added to the charge for the least cost.Alternatively, it is possible to fix a finaltarget furnace weight rather then a leastamount of material addition. In both cases,a maximum furnace weight can be definedto avoid any overflow on this furnacecapacity.

ConfiguringMany configuration facilities allow ChargeCorrection to be set up to meet the specificoperational requirements.• If any element exceeds its upper

specification limit, then it is possible tochoose whether the correction shoulddilute the charge to reduce theconcentration to below this limit or not

• Losses of any element added to thecharge can be taken into account bydefining a Recovery Factor

• A maximum amount of a particularmaterial, allowed to correct a charge canbe defined

• Some materials can be defined as moredesirable by changing their apparent costwhen the charge additions are calculated

• Materials can be grouped and each groupallocated to a charge qualityspecification. Only materials from thisgroup will be considered for thecorrection of this charge

• Unlimited number of elements usingunlimited number of stock materials canbe handled in a single calculation

• Final Charge Correction report can betailored at will

Automatic Grading, ChargeCorrection and materials groupfile selectionsAt the end of the sample analysis, gradechecking followed by Charge Correctionmaterials group selection can be donemanually by the operator or in a fullyautomatic manner with criteria’s based on:• The Sample Identity• The Task, the Method, the Type Standard

or the Grade name used to perform thesample analysis

• The concentration level of element(s) inthe final sample analysis result

• … and many other possibilities.The dispatch of the sample analysis

result with the final charge correction reportto printers or video displays can also bedone in a full automatic manner if desired.

This software product specification is valid forOXSAS version 1.1.3 and upwards.

PS41083_E 12/10C

Thermo Fisher Scientific (Ecublens) SARL,Switzerland is ISO certified.

Africa-Other +27 11 570 1840Australia +61 3 9757 4300Austria +43 1 333 50 34 0Belgium +32 53 73 42 41Canada +1 800 530 8447China +86 10 8419 3588Denmark +45 70 23 62 60

Europe-Other +43 1 333 50 34 0Finland /Norway/Sweden

+46 8 556 468 00France +33 1 60 92 48 00Germany +49 6103 408 1014India +91 22 6742 9434Italy +39 02 950 591

Japan +81 45 453 9100Latin America +1 561 688 8700Middle East +43 1 333 50 34 0Netherlands +31 76 579 55 55New Zealand +64 9 980 6700Russia/CIS +43 1 333 50 34 0South Africa +27 11 570 1840

Spain +34 914 845 965Switzerland +41 21 694 71 11UK +44 1442 233555USA +1 800 532 4752

www.thermoscientific.com©2010 Thermo Fisher Scientific Inc. All rights reserved. All trademarks are the property of Thermo Fisher Scientific Inc. and its subsidiaries.Specifications, terms and pricing are subject to change. Not all products are available in all countries. Please consult your local sales representative for details.

Example of an analysis result with aCharge Correction report

Analysis processing for a Charge Correction