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with low eutectic points, can remove up to 3 L of water in a 24-h period. Two V2-hp refrigeration systems cool the condenser temperature to —84 °C; the condenser coil will collect up to 12 L of ice before defrosting is necessary. Labconco 410 Gas analysis. Model 402 on-line gas analyzer monitors the purity of gases such as oxygen, nitrogen, hydrogen, and argon by measuring hydrocarbon contamination levels. The instrument features three switch-selectable measuring ranges. Teledyne Analytical Instruments 409 MS. The Resolver is a quadrupole mass, spectrometer that is capable of electron impact, chemical ionization, desorption ionization, fast atom bombardment, and thermospray LC/MS coupling. Plug-in sources facilitate the conversion from one mode to another. Nermag 411
Model 1810 scanning electron microscope features resolution down to 40 À, pushbutton control of magnification from 10X to 200.000X and of voltage from 0 to 30 kV, and digital imaging. Amray 401
ICP. JY 24 is a sequential spectrometer for multielement analysis by ICPAES that incorporates a compact Czerny Turner monochromator and a 40MHz generator. The instrument features an analytical range from 170 to 800 nm and is controlled by an IBM PS/2 or compatible computer. Instruments SA 404 Conductivity. LC conductivity monitor, designed for monitoring salt gradients in ion-exchange and affinity chromatography, features a range of 0100 mS. The monitor uses AC signal and chip technology for drift-free measurements without electrode platinization. Kontes 405 GC. Carlo Erba Mega Series 5300 hightemperature, high-resolution gas chromatograph incorporates a septumless, cold on-column injector that guards against discrimination of higher molecular weight components (C40+) found
in programmed temperature vaporizing injectors. Haake Buchler Instruments 407 XRF. Field-portable XRF spectrometer simultaneously detects Na through U at parts-per-million levels. Features include a high-resolution Si(Li) X-ray detector, multichannel analyzer data acquisition system, and safety-interlocked radioisotope source/sample holder. HNU Systems 406 Amino acids. BAS-200 P T H is a chromatographic analyzer for picomole determinations of P T H - a m i n o acids from Edman sequencing of proteins and peptides. All 20 P T H derivatives are resolved in 18 min, with cycle times of 30 min; detection limits are
