New Products
Don't Sweat About Humidity Measure it quickly, easily, and accurately with the YSI Model 90 Electronic Psychrometer. This modern version of the old-time sling psychrometer uses a battery-powered aspirator to assure constant air flow past YSI linear thermistor sensors, and reads directly in wet bulb depression and dry bulb temperature.
Model 1675 multiple column oven gas chromatography system has two independent column ovens with independent temperature control. Further versatility is provided by the separate detector oven for dual thermal conductivity, dual flame ionization, and dual electron capture detectors. Accessories are available for temperature programming, gas sample injection, pyrolysis, back-flushing, and automatic solid sample injection. A complete 4-column four-detector system with temperature programming sells for less than $6700. HCL Scientific, Inc., 327 S. Winnebago, P.O. Box 4223, Rockford, III. 61110. 815-963-6181 405
Metallic Combination Electrode
A new single-probe platinum/ silver chloride model electrode exposes a wire element instead of the conventional disc and thereby achieves greater contact than previously possible. The electrode is especially useful for work with small samples and in water pollution analyses. Range is —5 to +110°C. The new 5-in. electrode with 30-in. lead is available for $49.50. Fisher Scientific Co., 312 Fisher Bldg., Pittsburgh, Pa. 15219. 412-391-1330 406
Volumetric Collecting Device
It is portable, the probe can be used remotely, and you can operate the system with one hand. Full scale meter deflection can be as little as 5°C wet bulb depression. Send for details and learn an easier way to measure humidity. We'll also send data on our new dew point hygrometers.
YELLOW SPRINGS INSTRUMENT CO. YELLOW SPRINGS, O H I O 4 5 3 8 7
The Volufrac volumetric collecting device measures in multiples of 250-/J fractions with a precision of 0.5% and lis unaffected by variation in flow rate in the range of 0.5 ml/hr to 300 ml/hr. The basic unit is a capillary tube with photodiode detectors spaced along the tube at equal intervals; the diodes report and check electronically on the bubble which separates fractions. The system made of glass and Teflon is fully compatible with the company's UltroRac or any other electronically controlled fraction collectors. $650. LKB Instruments, Inc., 12221 Parklawn Dr., Rockville, Md. 20852. 301-9496510 407
Refrigerated and Heated Bath
The Model 2095-SCR bath has a temperature range from —20 to +70 °C with control of ±0.05 °C or better. The bath capacity is 7 gal; BTU removal capacity is 1000 BTU at 0 °C. A threeposition switch allows use of the re-
Circle No. 138 on Readers' Service Card
104A
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ANALYTICAL CHEMISTRY, VOL. 42, NO. 3, MARCH 1970
frigerant in proportion to the cooling required. In addition, the self-contained refrigeration system permits use of the equipment as an internal circulating bath with external cooling capacity. §625. Forma Scientific, Inc., Box 649, Marietta, Ohio. 614-373-4763 408 90-Sec Automatic Oxygen Determinator
The Model RO-16 incorporates the company's impulse furnace which is capable of raising the single-use crucible and sample to operating temperature of 2700 °C in seconds. The oxygen content of steel, iron, nonferrous metals, and inorganic materials can be determined. Samples may be solid or powders ; a built-in weight compensator automatically corrects for sample weight variations from 0.8 to 1.2 g. Results are displayed directly as % oxygen; digital display reads from 1 to 1000 ppm. Accuracy is ± 2 ppm or ± 3 % of oxygen present, whichever is greater. $10,900. Laboratory Equipment Corp., 1415 Hilltop Rd., St. Joseph, Mich. 49085. 616-983-5533 409 Laboratory pH Meter
Model PH-4T pH meter is a lightweight instrument (6 1 / 2 lb) which offers an accuracy of ±0.025 pH to ±0.5 mV and a measuring pH range of 0 to 8 or 6 to 14 and - 2 0 0 to +1400 and +200 to -1400 mV. The instrument also has an expanded scale and connections for additional indicating instruments or recorders. $345. Amstro Corp., 120 Clinton Rd., Fairfield, N. J. 07006. 201-228-3881 410
