Manufacturers' Literature
Conductivity Instruments. Describes the SM-400 Series Solu Meter Control lers for continuous measurement and control of acid or caustic solutions. 2 pp. Beckman Instruments, Inc. 430
Ozone Meter. Features the Model 1100, designed to provide specific measure ment of ozone without interference from N 0 2 , S 0 2 , or other interfering gases. 6 pp. Columbia Scientific Indus tries Corp. 421
COD Digestion. Discusses a semiauto matic digestion technique using reagent ready-sealed glass ampuls as combus tion tubes and cuvettes. 4 pp. Oceanog raphy International Corp. 431
Strip Chart Recorder. Describes the Model 9176 10-in. laboratory recorder which offers both single- and dual-pen models and a choice of plug-in span and chart speed modules. 4 pp. Varian Instrument Div. 422 Photon Counting Spectrofluorometer. SLM 8000 features modular design and the latest state-of-the-art electronic and fluorescence technology. 8 pp. SLM Instruments, Inc. 423 Pharmaceutical Newsletter. Vol. 3, No. 1 contains articles on the use of Technicon automated systems by a poultry breeding farm and small pharmaceuti cal manufacturers, as well as informa tion on literature and books of interest. 6 pp. Technicon Industrial Systems 424
Liquid Scintillation Counting Theory and Techniques. Presents an overview covering the aspects of LS counting necessary for valid interpretation of ex perimental data: physical process, in strumental operation of the LS counter, and chemical and mechanical pro cesses. 56 pp. Beckman Instruments, Inc. 432 A / D and D/A Conversion Modules. In cludes the complete line of data con version products and a wide variety of new products and improved specifica tions as well as guidelines to design and selection. 16 pp. Analogic 433 Quantitative Gas Chromatography. Bulletin 770 is a basic introduction to quantitative GC and points out limita tions in the technique and how to over c o m e them. 4 pp. Supelco, Inc. 435
Digital Temperature Standards. Dis cusses line of temperature measure ment standards available in complete systems consisting of a calibrated plati num RTD probe and a drift-free preci sion digital indicator calibrated to match the probe characteristics. 6 pp. Doric Scientific Div., Emerson Electric Co. 434 Oscilloscopes. Two brochures describe Explorer II and Explorer III, two generalpurpose digital oscilloscopes for lowfrequency, high-precision waveform measurement. Nicolet Instrument Corp.
436 Dual-Detector Spectrophotometer. De scribes Model D-117 dual-detector stopped-flow spectrophotometer for dual-wavelength and polarization mea surements of fast chemical reactions. The modular design is explained, and applications are discussed. 4 pp. Durrum Instrument Corp. 437 Aminco Laboratory News. Vol. 32, No. 1 features many articles of interest in cluding ones on mutant respiratory pro teins, a new creatine phosphokinase screening method, automated blood chemistry analysis, and a radioactive waste gas compressor. 28 pp. A m e r i can Instrument Co. 438
Liquid Chromatography. LC at Work Series offers three new application notes, "Quantitative Determination of Caffeine in Beverages", "Separation and Quantitative Analysis of Phenothiazines by Liquid Chromatography", and "Separation and Quantitative Determi nation of Corticosteroids in Pharmaceu tical Preparations". Varian Instrument Div. 425 Microparticle Standards. Describes the expanded line of standards useful as reference compounds to calibrate parti cle analyzers, check filters, and c o m pare microscopy specimens. 4 pp. Duke Scientific Corp. 426 Hydrogen Purifiers. Features full line of palladium alloy hydrogen purifiers ranging from 1 to 500 SCFH. 4 pp. Re source Systems, Inc. 427 Ultrafiltration Membranes and Sys tems. Guide includes information on the complete line of laboratory-scale systems for concentrating, desalting, and fractionating macromolecules and viruses. 9 pp. Millipore Corp. 429 Molecular Weight Standards. De scribes narrow molecular weight distri bution standards for instrument calibra tion and polymer characterization by membrane osmometry, vapor-pressure osmometry, liquid chromatography, gel permeation chromatography, and light scattering. Arro Laboratories 443
OUR SMALL-SPACE METERING PUMP IS BIG ON ACCURACY. Our Series 20 Chem/Meter hydraulic diaphragm metering pump will give you repetitive accuracy within ± 1% or better. Measuring only 9%" χ 4>έ" χ 3^ί6", it's designed for steady, con tinuous feeding of clear fluids. How? The programmed cam drive produces a constant velocity discharge—when the full displace ment of two plungers working 180° apart are combined in a common manifold, a steady flow is established. And it provides capacities to 4.9 and 16.0 ML/min —with pressures to 1000 psig. The series 20 Chem/Meter's wetted parts are made of corro sive resistant stainless steel with sapphire balls-seats and teflon diaphragms.With its totally enclosed, no-seal leakproof design and remote capacity control, its features make it ideal for applications such as chromatography columns, laboratory apparatus and indus trial wet process analytical equipment. To get all the details on why our little Chem/Meter is a big per former, write Chempump Division, CraneCo., Warrington, Pa. 18976.
CRANE
CHEMPUMP CIRCLE 32 ON READER SERVICE CARD
ANALYTICAL CHEMISTRY, VOL. 49, NO. 9, AUGUST 1977 • 819 A
