Download - Review - Hindawi Publishing Corporationdownloads.hindawi.com/journals/jamc/1981/736218.pdf · 2019. 8. 1. · various publications and audio-visual aids onthe basics ofLC. Varian

Product News

The A VL 940 automatic blood gasanalyser from Laboratory Impex

Recording data processorShimadzu has introduced a computeriseddata processor for use with GC, LC,TLC and AA. The machine featurescontinuously variable peak width inte-gration, full battery protected memoryand alpha numeric capability. Up to339 peaks can be stored and processedto provide data identifications usingeither absolute retention time, relativeretention time, time band or timewindow methods. Quantitation methodssuch as area normalisation, corrected areanormalisation, scale factors, internal

Small sample blood gas analyser standards and absolute calibration curveA fully automated pH/blood gas analyser are available and concentrations can beworking on 40/.tl samples is now available presented in any unit of percent, mg,in the UK from Laboratory Impex. The /.tg and ppm.AVL 940 produces digital and hard copy Shimadzu Scientific Instruments Inc,records of PO2, PCO2 and pH. PO2 and 9147-H Red Branch Rd, Columbia,PCO concentrations are displayed in MD 21045, USAmmHg, or a readout in kPa is available.The instrument then requires type ofpatient (adult or foetal), patient temper-ature and Hb level to provide thefollowing calculated values: base excessin vivo and in vitro, buffer base, actualbicarbonate, total COz, oxygen satur-ation and oxygen content. Full analysistakes 50 seconds plus 15 seconds forpresentation of results.Laboratory Impex, Lion Rd, Twicken-ham, Middx. Tel 01 892 9157

PublicationsVarian has produced a 70 page buyers’guide presenting its entire liquid chrom-atography range from simple isocratedevices to the fully automatic LCsystem. There is also a synopsis ofvarious publications and audio-visualaids on the basics of LC.Varian Associates Ltd, 24-28 Manor Rd,Walton-on-Thames, Surrey

The second quarter, 1981 issue ofTechnicon’s New Products Newsletter,has information on the company’s up-dated product lines, including the newGT system for accelerated throughputon the AutoAnalyser II, introduced atPittsburg, and the AutoAnalyser IIC Plussystem for dfita handling and instrumentcontrol.Technicon Industrial Systems, Tarry-town, New York 10591 USA

From Techmation comes a cataloguedescribing laboratory, on-line and fieldinstrumentation for the analysis andmonitoring of principal air and waterpollutants and physical measurements.Selected products from ten manu-facturers are presented.Techmation Ltd, 58 Edgware Way,Edgware, Middx. Tel 01 958 3111

The complete range of Camag TLCinstruments is presented in a 48 pagebrochure now available from thecompany. All phases of TLC process arecovered from sample application up toquantitative (densitometric) evaluation.Detail descriptions of apparatus areaccompanied by methodological explan-ations.Available from any Camag distributoror agent

ok ReviewElectronics and instrumentationfor scientists

Howard V. Malmstadt, Christie G. Enkeand Stanley R. CrouchThe Benjamin/Cummings PublishingCompany Inc, USAOrder code::36917. Price 24.95

This is the latest edition of what hasbecome one of the standard works forthe instruction of scientists, and partic-ularly chemists, in basic electronics andinstrumentation. The aim of the book isto provide scientists with an efficientmeans of understanding the principlesof modem electronic instrumentation sothat they can confidently choose instru-ments and apply them to their fullpotential. The subject is thereforemodem electronics with an emphasis onits applications in scientific instru-ment. and control systems and com-puters. In all its editions the book hasbeen written particularly for studentsand practitioners in all areas of scienceand engineering. The presentation is bothpractical and fundamental. The newedition of the book reflects the factthat we have now entered a new era in

approach to the study of electronics.From the users point of view, the avail-ability of complete high performanceelectronic functions such as operationalamplifiers and decade counters inencapsulated, unalterable integrated cir-cuit form, makes the detailed study oftransistor amplifier and flip-flop design

are integrated through the concept ofelectrical data domains, which are theways in which data can be encoded inelectrical signals. Instrumentation con-cepts including feedback control, signal-to-noise enhancement, microcomputerinterfacing, data acquisition and signalprocessing are presented along with the

less critical than a knowledge of the techniques and devices for their imple-functions performed by the IC’s and mentation.their applications. At the same time The book as in its earlier editions isthe widespread application of sophisti- useful for structured coursework or forcared electronic functions such as self study. The fourteen chaptersphase-locked loops, analog multipliers included are of nearly uniform lengthand microprocessors creates the need tounderstand the principles of advancedmeasurement and control techniquesthat are being used in the most commonlaboratory instruments.

The book is organised around systemprinciples and electronic functions ratherthan the detailed analysis of particularcomponents. The latter however are notneglected, since components of all types,from resistors through transistors andintegrated circuits, are studied as thedevices by which the various functionscan be implemented, Because of thisapproach, new devices will not makeobsolete the knowledge gained from this

scientific instrumentation; the era of study; rather they will be recognised asmicroelectronics. Microcircuits provide new ways to achieve the appropriateboth the basis and the need for a new functions. Analog and digital techniques

and complexity so that each comprisesa similar unit of study. The problemsat the end of each chapter are useful forreview. This book.is organised to supporta parallel laboratory if structured course-work is concerned. A list of suggestedexperiments follows each chapter toindicate the areas of practice the chapterhas introduced.

The authors are to be congratulatedon the new edition of this standardwork; the high standard of productionseen in earlier editions has been main-tained and its value has been increasedimmeasurably by the revisions made toinclude more of the microelectronicswhich are pertinent to modern analyti-cal instrumentation.

G.F. Kirkbright

160 Journal of Automatic Chemistry

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