Rotation Direction of Magnetic Stirrers and Stirrer/Hot Plates for Bottom-Driven SpinningBand Distillation Columns Robert Rothchlld The City University of New York. John Jay College of Criminal Justice. Toxicology Research and Training Center. Department of Science. 445 West 59th Street. New York. NY 10019 Relatively inexpensive magnetically hottom-driven Teflon spinning-band distillation culumnr hare rrrently lwrome available horn at least two supplirrs tCorning Glaas \Vorks and .4cr Glass. Inr.). The current models have a left-hand helix, and, for proper operation, require clockwise rotation of the spinning-band when viewed from oboue. For labs considering the adoption of these microscale distillation calumns, pmper stirrer rotation direction must be confirmed before placing orders. Unfortunately, current manufacturers' literature on these columns and the magnetic stirrers or hot platelstirrers with which they can be used does not address rotation direction or column helicity. The information in the table has been gathered from suppliers and manufacturers of magnetic stirrers in an effort to aid others in selecting the proper equipment. Although stirrer rotation may be reversed in some cases, such modifications by the user may void the warranties and present potential hazards. Communication with the dealer or manufacturer is strongly encouraged since some items may be available on special order with rotation directionsopposite to those listed. The table notes some cases where units that are normally available with clockwise rotation (appropriate far current Corning or Ace microscale columns) are alternatively available with opposite rotation for possible special applications. Acknowledgment
Rotation Dlrectlonr ol Hot PlatelStlrrers ( a s Vlewed from Above) Mfr. or Supplier
Model or Catalog No.
RDtation Direction
Ace Glass, tnc. (Vineland. NJ 08360) Coming, lnc. (Corning. NY 14831)
dl models clockwlse
Dynalon (Rochester. NY 14623)
(reversible by abihorized Corning dealer) CIOCkwiSe
bolh ~lo~kwlse
Cat. no. 204016 (VWR PIN 58947-088) 120M. 120MR
Fisher Sciemific(Springfield. NJ 07081)
c~~nter~lo~kwise all clockwise all clockwise
LaMine Instr., Inc. (Melrose Park. IL 601601 mermolyne. Inc. (Dubuque. IA 52004)
11-500-12SH, 11-498-7SH and 240V versions 11-493-120MRand 2404 version 2001.2003.2008.2009 1250, 1266. 1268, 1270. 1278 Type 1000 (SPA 10258) Type loloo (sPlolo5B)
Troemner lnc. (Philadelphia, PA 19142) [Available ham VWR Scientific, lnc.; VWR part numbers are shown in parentheses.]
Nuovaseries (SP16425, SP18420) C i m c series 46600.46900. 47200 (e.g.. SP46615. SP46925. SP47235 and 2404 versions) Series 400 (PIN 33918320. 33918330,33918331.58935-373) stirrer 360 (PIN 58935-351) hot platelstirrer 370 (PIN 33918-239) Submersible stirrer 700 (PIN 56947408) Gyratherm (PIN 58922-054) Dviastir (PIN 58935-2501 D&O&l (PIN 58849-001) stirrer 200 (PIN 58940-158) hot platelstiner 220 (PIN 33918-603)
~~~nter~lo~kwise bidirectional all models Munterclockwl~e Co~ntercI~ckwi~e clock~ise(availeble COUnterClD~kwi~e on special order) ~lo~kwise Clockwise clockwlse (available M~nterclockwise on special order)
all models clockwise (undirectiooal)
This work has been supported, in part, by grants from the U.S. Department of Education Minority Science Improvement Program, Hewlett-Packard Corporation, U S . D e ~ a r t m e n tof Energy Energy-Related Laboratory Equipment Program, Hoffmam-La Roehe, Inc., and the Sandoz Research Institute. Volume 67
Number 12
December 1990
A305
