Potentiometric recorders: here's the picture. Shown here, a portrait of all there is to know about potentiometric recorders. All from Sargent-Welch. And each deserves its own personality profile: Model SRG: The basic recorder, distinguished by its advanced perform ance. Seven pre-calibrated spans. Three chart speeds. Guarded circuits and filtered inputs. Accuracy: ±0.25%. Reproduci bility: ± 0 . 1 % . Fullscale pen response: Less than one second. Basic price: $1025. Model DSRG: The SRG times two. That is, a d u a l - p e n r e corder, with two linear channels, for record ing two time-related variables, side by side or overlapping, on the same c h a r t . Same matchless perform ance as the SRG, but only a few inches wider. Think of it as a s p a c e - and papersaver. Basic p r i c e : $1800. Model SRLG: The SRG taken one step further, with the addi tion of a logarithmic function. Eminently suited, there fore, for recording (say) the log of absorbance with a spectrophotometer. Precision, non-circular gears — which do the job much better than electrical approxi
mations to the log function. Basic price: $1325. Model DSRLG: Another logical move. Two SRLG's in one dual-pen recorder. Think of what that means if you work with a spectrophotometer, photometer, or densi tometer — simultane ous recording of both transmittance and ab sorbance. Or linear/ log recording of any two time-synchronized variables. Basic price: $2225. Model SRG-GC: Something special, for use with a gas chromatograph. Fast re sponse, high AC rejec t i o n , f l o a t i n g input, three chart speeds, and continuously vari able wide-range spans. Optional integrator for precise measurement of a r e a s u n d e r re corded curve. Basic price: $1025 (with in tegrator, $1820). Model MR: The ulti mate recorder? Per haps. Few can match it for precision, speed, sensitivity, and versal t i l i t y . Measures and records (vs. time) any variable that can be translated into voltage or current, or that can be time-related by synchronous drive. Twelve ranges, twelve speeds. Basic price: $2850. As we said, a complete picture of a complete line.
Now read the book. O-ZM
Still, in all fairness, one picture and these few words don't do justice to our complete line of recorders. So we've prepared a fully illustrated, 30-page catalog. It's yours, without obligation, for returning the coupon. Do it now. I'd G Π Π
like a copy of your recorder catalog. Model SRG Recorder Model DSRG Dual-Pen Recorder Model SRLG Linear-Log Recorder
I'm especially interested in: • Model DSRLG Dual-Pen Linear-Log Recorder • Model SRG-GC Recorder for Gas Chromatographs • Model MR Multi-Range Recorder
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SARGENT-WELCH Scientific instruments, apparatus, chemicals. Sargent-Welch Scientific Company 7300 N. Linder Ave., Skokie, Illinois 60076 Chicago/ Anaheim /Birmingham/ Cincinnati Cleveland/Dallas/Denver/Detroit Springfield, N.J./Toronto/Montreal/Vancouver
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CIRCLE 163 ON READER SERVICE CARD
ANALYTICAL CHEMISTRY, VOL. 43, NO. 6, MAY 1971
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