ii product ewspye unicam is adding toits range ofgas chromatographic equipment with six new...

Product eWSEditor’s Note:. The address of themanufacturer/supplier appears in italicsat the end of each item. In some casesthis address will be that of a subsidiaryto the manufacturing company as theaddress given is that from which theinformation has been obtained.

Computer controlled GCVarian has introduced the GC 6000microcomputer controlled gas chroma-tograph featuring an interactive CRT/keyboard for easier operation. It can becoupled to the company’s GC 6500satellite unit, effectively doubling itschromatographic capabilities whilesaving bench space and capital cost.

The internal memory will store up toeight analysis methods with chromato-graphic conditions constantly displayedduring an analysis.

The GC 6500 satellite facility iscontrolled from the GC 6000 or a Vista44; interfacing to the Vista 601 datasystem is possible to give a powerfulautomatic unit. Complete automation ispossible using Varian auto samplers. Achoice of injectors and detectors forpacked as well as capillary columns isavailable, including fused silica.Varian Associates Ltd, 24-28 Manor Rd,Walton-on-Thames, Surrey

Graphite furnace accessory for AAPerkin-Elmer’s Zeeman/5000 is beingintroduced as an accessory to the com-puter controlled Model 5000 atomicabsorption spectrophotometer. It com-bines the HGA-500 furnace with a newapproach to Zeeman effect atomicabsorption spectrophotometry calledtransverse AC Zeeman. This featurecorrects for background absorption atvery high levels (1.5 A and higher)with no loss in sensitivity, and is thusvery useful when determining traceelements in oils, biological matrices andsteels. The accessory can be easilyswitched from this mode into double-beam flame atomic absorption withUV/vis background correction if needed.Perkin-Elmer L td, Post Office Lane,Beaconsfield, Bucks.

Ether substituteMethyl tert-butyl ether (MTBE) whichmay be used as a direct (and lesshazardous) substitute for ethyl ether isnow available from Fisher Scientific.The boiling point of MTBE is higherthan ether at 55C and it does not formperoxides as readily. It is available inthree purity grades; an HPLC grade, aCertified grade and a straight Purifiedgrade.

158

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Varian GC6000 microcomputer controlled gas chromatograph

Superbrain! detector/recorder or integrator to giveAnaspec has introduced the Superbrain, flow rates from 0.1 to 10 ml/min fora microcomputer intended for scientific mobile phases of up to three solventsand engineering applications with a built- for isocratic, binary gradient or ternaryin display, keyboard and floppy disk gradient work The system providesdrive. It’s based on the CP/M operating continuous solvent degassing and cansystem and allows users to write com- sort up to 10 sets of operating conditionspiled programs in FORTRAN, APL, entered on the 8700’skeypad.COBOL and BASIC. It has 64K of user There are also three complete systemsmemory and up to 700K of disk capa- covering both fixed and variable wave-city. Hard disks can be added at a later length detection, this time based on anstage to give up to 96 M bytes of storage. SP 870018750 combination.Input/output facilities include RS232C Spectra-Physics Ltd, 17 Brick Knolland S-100 connections for simplified Park, St. A lbans, Herts.connections of peripherals, interfacesetc.Anaspec Research Laboratories Ltd,Pearl House, Bartholomew St, Newbury,Berks.

LC systemsBased on the recently introduced SP8700 solvent delivery system, Spectra-Physics has announced several newchromatography systems to cover appli-cations for the most basic up to highperformance systems. At the bottom ofthe range, the SP 8700 is combined withthe SP 9750 organiser module whichlinks

Reagent/wash valveChemLab’s Mk 2 reagent/wash valve isintended to reduce the amount of timeit takes to wash through a continuousflow analysis system at the end of aperiod of analysis. It is said to operatefor long periods with minimal attention.Each valve has eight precision, glass-filled PTFE modules fitted with the inletand outlet nipples for one reagent lineand sealed off from the module next toit. A maximum of eight reagent linescan be used.ChemLab Instruments Ltd, Hornminster

directly with an appropriate House, 129 Upminster Rd, Hornchurch,Essex RM11 3XJ. TelHornchurch 5 7011

Fisher Scientific’s solvent MTBE

Thermal analysisMettler’s new TA 3000 automatedthermal analysis system is built arounda microprocessor control centre to givean instrument with programme controlof experiment and data analysis from asimple keyboard. The TC10 centralprocessor can be used with differentialscanning calorimetry, thermogravimetryor thermomechanical analysis measuringmodules and incorporates a range ofdata evaluation programmes for eachmodule.MSE Scientific Instruments, ManorRoyal Crawley, Sussex.

Journal of Automatic Chemistry

Poduct News

Gas chromatograph Luminescence spectrometers GC gas filter systemDespite the advantages of micropro- Perkin-Elmer has introduced the LS Chrompack has introduced a new systemcessor control for your gas chromato- series of luminescence spectrometers for cleaning gas streams in gas chroma-graph, the incorporation of sophisti- which combine a pulsed xenon source tography. The design of the filteringcared electronics has often put such with microprocessor, electronics to give systems allows saturated filters to beinstruments out of the reach of many a versatile range of instruments. The changed without interrupting thelaboratories. To bridge this gap, Packard LS-5 for example measures fluorescence, analysis for more than a few seconds.has introduced the 437 and 438 gas phosphorescence and chemilumin- The filter has two elements -the filterchromatographs which use the estab- escence, with a quantum corrected itself and a connecting unit. Thislished 427 and 428 instruments as reference system giving fully corrected is equipped with in-and outlet pointstheir basis with microprocessor control excitation spectra. The LS-3 is a basic for the gas flow and two needle valvesthough the company says that this is fluorescence spectrometer designed for start and stop the gas flow. Gas flow isnot achieved at the expense of the routine quality control measurements, started simply by pressing the filterprice tag. Operation parameters are Semi-corrected excitation spectra are onto the base plate. The filters them-combined in one fixed programming obtained through the use of a micro- selves are made of heavy wall acrylicsequence with LEDs in the input keys processor controlled background plastic and contain a high capacityto guide the operator through the corrector, oxygen filter and a moisture trap. Thereprogram. Perkin-Elmer L td, Post Office Lane, is also a charcoal trap to remove organic

The 437 is intended for use in Beaconsfield, Bucks. Tel 04946 6161routine analyses while the 438 hasincreased analytical flexibility to makeit more suited to complex applications.Five detectors are available; FID, TCD,ECD, NPD and FPD, any two of whichcan be installed and operated simul-taneously. The thermal conductivitydetector is a new microcell type withimproved lower detection limits.Packard Instrument Ltd, 13-17 ChurchRd, Caversham, Berks RG4 7AA

Null detectorPerkin-Elmer’s LS-5 spectrometer

Levell Electronics’ null detector typeTM10 has two logarithmic ranges. On Automated metals analysis by

compounds. The connecting unit isprovided with two 1/4 inch male con-nectors to incorporate the filter in a1/4 inch gas line. An adapter is availableif the filters.are to be used with inchgas lines.Chrompack, P 0 Box 3, 4330 AAMiddelburg, The NetherlandsChrompack UK, 61 Shrubbery Rd,London SW16

Computer controlled ELISA readerArtek Systems has launched a fullycomputer controlled ELISA readerunit, said to be the first of its kindavailable in Europe. The set-up incorpo-

the mV log range, + 10% fsd equals atomic absorption rates a ’dumb’ photometer (Model 210)+ 5/.tV approx, + 50% fsd equals + Varian has introduced two series of together with a separate computer5 mV approx and + 100% fsd equals atomic absorption spectrophotometer module (Model 200). The ELISA+ 500 mV approx. This range enables together with the software and a pro- reader operates under the control ofnull detection to be made throughout grammable sample changer to give an the computer and is said to be corn-an 80 dB change of voltage level without automated system for metals analysis, patible with most ELISA kits currently

The AA 1275/1475 series of AA spectro- on the market and to accommodaterange switching. Signal amplification isby a low drift monolithic integrated photometers has a built-in 8-bit micro- plates with flat, U or V bottom wells.circuit controlled by stabilizer circuits to computer for data collection, system Reading of each 96 well plate (dualensure that variations in the supply management and direct read-out of blank, negative, low positive, highbattery voltage and temperature have metal concentrations. The 1275 is a positive and 44 dual samples per plate)minimal effect on performance, single beam instrument with flame is initiated by inserting the plate into

Linear ranges of from + 30/aV to + emission capability while the 1475 is the reader and pressing one button.300 V and 30 + pA to + 300 mA are double-beamed with flame emission The ELISA reader has been designedalso covered on the meter, employing a time-shared double-beam to be adaptable to both turbidimetric

Battery life is typically over six system for source drift compensation, and fluorometricassays.months, l/arian Associates Ltd, 14-18 Manor Rd, Artek Systems Corporation, 32 Humber-Levell Electronics L td, Moxon St, 14/alton-on-Thames Surrey. stone Rd, Cambridge, CB4 1JFBarnet, Hertz. Tel O1 449 5028

’Modular’ GC SystemPye Unicam is adding to its range of gaschromatographic equipment with sixnew instruments. The PU4500 series issaid to combine high performance andthroughput with simple operation andto bring gas chromatography withinreach of a wider range of laboratories.System options can employ one or morePU4500 together with other optionsin the new range such as a micropro-cessor controlled autojector, a head-

!iiiiii:iii’i’!iiii’i :::.:.!i!ii::ii!space analyzer and a video control !i:!!i i.!!!ii!i!!ii!i!:!i!i!i: i!icentre giving multi-channel integrationand data handling facilities.Pye Unicam Ltd, York St, Cambridge. Pye Unicam "s PU4800 video control centre with Series 304 gas chromatograph

Volume -3 No. 3 July 1981 159

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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