at Sika Chemical — R E A C T O R S C O N T R O L L E D W I T H I N 0.1 p H by Foxboro D Y N A L O G * Recorder-Controllers At Sika Chemical Corp., Passaic, N. J., control of pH in reactors is of vital concern in manufacturing "Plastimet," Sika's widely-used concrete densifying additive. Sika finds Foxboro Dynalog RecorderControllers perfect for the job. Dynalog's smooth variable air capacitor ( w h i c h replaces troublesome step-by-step slidew i r e s ) responds instantly to the smallest c h a n g e in pH value. A Rotax on-off control unit then initiates addition of enough caustic soda to return reactor pH to set point. S i k a r e p o r t s m a i n t e n a n c e on t h e i r Dynalogs h a s b e e n almost nil. O n e tube
replaced in three y e a r s . No lubrication . . . n o c l e a n i n g . . . n o dry cells to standardize or replace. "In fact," s a y s process engineer Gordon Morrison, "we're so confident of Dynalog's performance that our reactors run right through the night — unattended." Dynalog Electronic Recorders—Controllers—Indicators deliver accurate, sensitive, measurement not only of pH, but of dozens of other variables a s well. Get full details b y writing for Bulletin 20-10. The Foxboro Company, 401 Neponset Ave., Foxboro, Mass.
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FOXBORO REG. U.S. PAT. OFF.
D Y N A L O G ELECTRONIC I N S T R U M E N T S
