now... for applications where cool, noiseless uniform flow rates, reproducibility, Jpmmmmmm^,^ ____ reversibility are
operation... and simple important...
ADVANCED MODEL
WITH SOLID STATE
CONTROLS
This versatile, foolproof model produces peristaltic effect to pump acids, bases, toxic and sterile liquids and gases—safely and quietly through flexible t u b i n g — w i t h o u t the liquid c o m i n g in contact w i t h pumping mechanism. Single control knob regulates uni formly variable speed control of gearless direct-drive permanent-magnet motor by solid-state c i r c u i t r y . . . f o r reprodgcibly adjusted speeds from 24 to 400 R.P.M. w i t h ± 3 % s t a b i l i t y . . . a n d a delivery volume range from 30 ml. to 5,000 ml. per minute. Switch action reversibility; fingertip control of forward and reverse speed. Maximum head—25 PSI gauge or 57 feet of water. Any soft, flexible tubing (from 45 to 70 durometer Shore) with Jf6" wall up to % " inside diameter can be used. Unit w e i g h s approx. 18 lbs.; is housed in handsome 2-tone lightweight metal cabinet—12 1 /2" long χ 9 1 /2" deep χ 7 1 /2" high. Available in 115-volt or 220-volt A.C. models. 72-895-05 Advanced Model Varistaltic Pump (115-volt A.C.) $210.00 72-895-05-22 Same Model, but 220-volt A.C $230.00 For information on our full tine of Varistaltic Pumps-Rheostat Controlled, Generator Feed-Back 'Solid State and Air Driven Explosion Proof Model, write tor Complete Bulletin. Available through your laboratory supply dealers,
MANOSTAT CORPORATION 20 N. MOORE ST. DEPT. 521.
DIVISION OF GREINER SCIENTIFIC CORP.
NEW YORK 10013 Circle No. 32 on Readers' Service Card
96 A ·
ANALYTICAL CHEMISTRY, VOL. 4 1 , NO. 14, DECEMBER 1969
Controlled,
