ANALYTICAL
18 A
CHEMISTRY
BECKMAN NEW MODEL H-2
GLASS E L E C T R O D E pH
METER
With extended voltage range 0 to 1400 millivolts for potentiometric measurements, and with polarizing current available for Karl Fischer and similar titrations
4923-F.
4923-B.
BECKMAN pH METER, Model H-2, line operated. A rugged, self-con tained, direct reading instrument, with vacuum tube voltmeter type circuit, op erating directly from standard 115-volt a.c. lines. For continuous pH measure merits, acid-alkali titrations, etc. Overlapping scales read from p H 0 to 8 and from p l l 6 to 14 in 0.1 p H divisions, and can be converted into millivolt measurements by use of a multiplier of 100. The desired range is selected by means of a seven-point panel switch. In general, a practical accuracy of ±0.05 p H can be expected over the range to p H 9.5. For use in the range p H 9 to 14, Type Ε glass electrode, with low sodium ion error, is recommended. With built-in temperature compensator, adjustable continuously over the range 0 to 100° C. Case is of cast aluminum, with crystal gray enamel finish, weight approx. 13 lbs. Polarizing current of approx. 10 microamperes is available at the glass electrode terminal — by means of an adapter at $2.00 extra — for use in Karl Fischer and similar titrations. 4923-B.
Beckman pH Meter, Model H-2, for a.c. line operation, as above described, complete with shielded glass electrode, calomel electrode, electrode holder, Pyrex beaker 50 ml, 100 ml bottle of saturated KC1 solution and 1 pt. of Buffer Mixture pH 7.0. With 5-ft. cord and fused plug; for use on 100 to 130-volt, 50 to 60 eye, a.c. only 195.00
4923-F.
Electrode Support, Corrosion-Resistant, consisting of base of Coors porcelain, rod of aluminum alloy, supporting rod for the electrode holder and clamp holder of nickelplated brass 5.65
4918-T1A. Glass Electrode, Type E, for use in the range pH 9 to pH 14 11.00 4935-M. Electrometric Titration Outfit, consisting of Model H-2 pH Meter, as above described, and accessories as shown in illustration. A combination which is especially con venient for rapid acid-alkali titrations. Titration accessories consist of base and swinging shelf of Coors porcelain, aluminuml rod, Castaloy burette clamp, paired burettes 50 ml in /ioths with angled tips, two nickelplated clamps, support for electrode holder, Pyrex beaker 250 ml and motor driven glass stirrer with speed control rheostat for 115 volts, 60 cycles a . c . . 248.67 9682-B.
Titration Accessories, only, without pH Meter or elec trodes 53.65
4935-M
ARTHUR H. THOMAS COMPANY RETAIL —WHOLESALE—EXPORT
LABORATORY APPARATUS AND REAGENTS WEST WASHINGTON SQUARE, PHILADELPHIA 5, PA., U. S. A.
Cable Address "Balance," Philadelphia
