Chloride Brochure 2015 v1.qxp Layout 1 10/06/2015 …

1 T.+44 (0) 1223 243444f.+44 (0) 1223 SCIENTIFICCHLORIDE ANALYSERSAN INSTRUMENTALANALOGUE OFARGENTIMETRYC hloride Brochure 2015 1 10/06/2015 15:04 Page 1 Designed for the determination of Chloride ions, the SherwoodScientific Chloride analysers are an instrumental analogue of Argentimetry ; the traditional titrimetric methods using SilverNitrate reagent. Like those classic methods, the 926 and 926S relyon formation of the insoluble salt, Silver importance of Chloride determination was realised well overa century ago, with many variations and changes being made inorder to improve detection limits and selectivity.

2 Research intoChloride analysis was conducted by Gay Lussac (1832), Levol(1853), Mohr (1856) and Volhard (1874). Their findings are thebasis of methods still in common use first instrument using these techniques was developed in the1960 s by Cotlove at the AMINCO Company. The 926 analysersdeveloped from that first instrument are now exclusively manu-factured in Cambridge, UK by sherwood scientific OF OPERATIONThe main difficulties with the classic Argentimetry methods werephotochemical reaction of Silver Nitrate reagent on storage andthe visually weak titration end point.

3 The methodology required ahighly skilled analytical 926 method is based on a coulometric titration wherein thereagent (Silver ions) is precisely and quantitatively generated, atthe time of analysis, by passing a constant current betweenelectrodes. The end-point is determined when excess Silver ionscause a change in conductivity; detected by the scientific MODEL 926 & 926St. +44 (0) 1223 243444f. +44 (0) 1223 243300e. AND ACCURACY OF THE 926 Chloride ANALYERSThe accuracy of the method is directly affected by the volumeof sample dispensed by the pipette.

4 A fixed volume: 500 l forthe Model 926; 100 l or 20 l for Model 926S, is pipetted intothe Buffer solution. A further 6 samples (Model 926) or 19samples (Model 926S) may be added into the Buffer before theinstrument prompts a reagent APPLICATION AREASI ndustrial Model 926 The measurement of Salt (Sodium Chloride ) in the Food and DairyIndustry is universal. The ability to read directly, Saltconcentration and the automatic endpoint detection system hasmade the 926 the instrument of choice for food manufacturers andanalysts throughout the and salinity also represent serious contamination in manyindustrial processes.

5 The sensitivity of the coulometric methodenables ppm range measurement in boiler feed water; polymerwashes; borehole slurries as well as soil salinity studies. The 926is intended for general laboratory use and is calibrated in ppm(mg/l) Chloride . The Select Button offers the immediateconversion of Chloride content into mg% Salt (Sodium Chloride )of the original sample*.* assumes ratio 1g of sample to 100ml diluentClinical Model 926 SRaised Chloride concentration in sweat of young children is aCystic Fibrosis indicator. The 926S is intended for Chloridemeasurement in biological samples and calibrated in mmol/l.

6 The926S can accept original samples of as little as 20 l and from alltypes of sweat generators. The Select Button switches betweensample volumes of 20 or 100 lREAGENTSC hloride analyser BufferA non-hazardous mixture of acids with other componentsdesigned to give highly reproducible results when used with theModels 926 and 926S. It provides the medium required for thedissolution and reaction between the Silver and Chloride StandardsAvailable at 200mg/l and 100mmol/l; both are traceable to NIST standards. These stable solutions are used to verifyinstrumentation calibration and accur acy and precision ofpipetting Electrode PolishUsed to keep the Silver electrodes in good anode is a pure Silver electrode, which is sacrificed bydissolution into Silver ions.

7 Once the end of the electrode is dissolvedthe anode can be repositioned for extended use. The cathodecompletes the electrical circuit with the anode. Two detectorelectrodes monitor the conductivity of thereacting ElectrodesStirrerAnode Button. Forthe 926; factorconversion of mg/l Cl tomg% Salt. For the926S; selects samplevolume of 100ul or Buttontitrates anycontaminant in buffer and sets ButtonInitiates titrationsequenceChloride Brochure 2015 1 10/06/2015 15:04 Page 2 ACTIVE SALT SOFTWARE(not for use with the 926S)Active Salt Software was developed to enhance the 926 ChlorideAnalyser.

8 Designed initially for the Cheese industry, the softwaremay be applied to any food product requiring salt analysis in a foodprocessor s QA/QC Lab. Active Salt can collect data from a balancewith RS232 output and Chloride analyser results. One PC with oneActive salt package can colle ct data from two analysers and twobalancesAdvantages include: No transcription errors Instant product salt content calculations No need to achieve specific sample and diluent weights Data storage and analysis report generation The coulometric method is very robust and versatile.

9 These microprocessor based Instruments are ergonomicallydesigned, easy to use and maintain The sherwood Chloride analyser Buffer system, specificallydesigned for the model 926 and 926S, gives outstanding sensitivityand INFORMATIONM odel 926 Chloride Analyser926 00 009 Model 926S Chloride Analyser926 00 109 Silver Anodes (pack of 3)92511003 Electrode detectors and cathode92511002 Active Salt data collection and salt analysis package 92686500 sherwood scientific MODEL 926 & 926 STHE 926 ADVANTAGEt. +44 (0) 1223 243444f. +44 (0) 1223 243300e. Model ApplicationUnitsSample sizeReadout RangeAccuracyReproducibilityMeasurement timeVoltage (Mains adapter input)SizePacked SizeNet Weight Gross WeightPacked unit contains926 Industrialmg/l500 l10- 999 mg/l2-165 mg% Salt 3 mg/l at the 200 mg/l levelCV <1% for 20 replicate samples @ 200 mg/l(excluding pipetting errors) 36 seconds to 200 mg/l100 - 240V ~, 50 60 Hz, mm x 200 mm x 250 mm385 mm x 370 mm x 450 kgModel 926, Printer cable 9 way RS232, Buffer (500ml), 200mg/l standard (100ml)

10 , 1 pack of anodes, 1pack of electrodes, 2 marked beakers, SilverElectrode Polish, Stirrer, Operator Manual,Universal Mains adapter and USB lead A(M) B(M)926 SClinicalmmol/l100 l or 20 l10-299 mmol/lResults would be within one Standard Deviation ofthe mean values of recognized QC schemes mmol/l at the 100 mmol/l levelCV 100 l sample <1% 20 l sample < seconds to 100 mmol/l100 - 240V ~, 50 60 Hz, mm x 200 mm x 250 mm385 mm x 370 mm x 450 kgModel 926S, Printer cable 9 way RS232, Buffer(500 ml), 100 mmol/l standard (100ml), 1 pack ofanodes, 1 pack of electrodes, 2 marked beakers,Silver Electrode Polish, Stirrer, Operator Manual,Unive rsal Mains adapter and USB lead A(M) B(M)100mmol/litre Standard 6 x 100ml00156202200mg/litre Standard 6 x 100ml00156203 Chloride analyser Buffer 1 x 500ml00156208 Silver Electrode Polish 00156205 Chloride Brochure 2015 1 10/06/2015 15:05 Page 3 TIINTRODUCAAND HERITALtd.