14A
ANALYTICAL
CHEMISTRY
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"PRECISION"-DOW
DUAL RECORDOMATIC TITRATOR • TITRATES AND RECORDS AUTOMATICALLY • PRODUCES R A P I D , ACCURATE RESULTS • ELIMINATES ALL WORK EXCEPT PREPARING SOLUTIONS AND LOADING FEED UNITS
A valuable new development for the laboratory, designed t o cut titration time and work to a fraction . . . the "Precision"-Dow Dual Recordomatic Titrator is a unique instrument, first of its kind on the market. The new Titrator titrates and records automatically, rapidly and accurately. It eliminates all work on the part of the operator except that of preparing solutions and loading the feed unit. It provides a permanent and complete record of titrations superior to curves obtained manually. A dual instrument . . . with two complete titration set-ups . . . it titrates one Sample while the second is being prepared and loaded in the feed unit.
THE "PREGISION"-DOW DUAL RECORDOMATIC TITRATOR CONSISTS OF TWO PARTS: (1) a reagent feeding device, and (2) recording potentiometer...·,
The Titrator is recommended for routine control work, as well as experimental research in chemical, industrial and petroleum laboratories . . . for studying new reactions . . . for determining suitable indicators . . . for acidity determinations on petroleum products (ASTM Method D664) . . . for Mercaptan determinations . . . among its many potential uses. Equally well suited for aqueous and non-aqueous media, it may be used with silver, antimony, platinum, calomel or glass electrodes. The instrument is built for continuous, hard duty . . . with sustained accuracy assured throughout its long life. Completely line-operated except for a N o . 6 dry cell in the potentiometer circuit. Power consumption is only 200 watts.
(1) The reagent feeding unit includes two complete set-ups . . . right and left syringes to hold and feed reagents . . . corresponding beakers containing test solutions and indicating electrodes. A Solenoid-operated shifting permits selection of right or left system for titration. (2) For recording and controlling the titration, a modified Brown Electronik potentiometer is used. Input to the potentiometer is a line-operated vacuum tube amplifier of the balanced tube type. Five meter scale and potentiometric circuits are provided, giving the instrument a total range of —1.5 to -1-1.5 volts, and a full pH range of 0 to 14. Write for detailed Bulletin No. 640-Ç. See. Ί/
