All thermal analysis systems for DTAJGA and TMA were not created equal. Our apologies if we sound undemo cratic. But Perkin-Elmer thermal analysis systems are the continu ing choice of both the demanding r e s e a r c h e r and t h e v a l u e - c o n scious quality control chemist. And for some very convincing reasons. For example: The Model DSC-1B Differential Scanning Calorimeter This is the only true Differential Scanning Calorimeter (DSC) in the field (U.S. Patent No. 3263484). It records energy directly. Calibrate it at one temperature, and it holds over the whole range and under all conditions. The direct power measuring principle, low thermal mass and minimal thermal gradients provide the highest sensitivity and resolu tion available, with the fastest usable heating and cooling rates. With the DSC-1B, applications which are difficult if not impossible with conventional systems are rou tine. Specific heat. Absolute purity. Crystallinity. Reaction kinetics. And that's naming only a few.
source, for negligible balance "drift" with temperature. Almost instant cooling from 1000°C to ambient for shortest "turn around" time and maximum instrument utility. The magnetic transition tem perature calibration system (patent applied for) provides Τ calibration in the sample space, not just some where near it. In fact, the TGS-1 is the only rapid scanning TGA sys^ tern providing sample temperatures you can believe. The Cahn RG Electrobalance® we use is famous for its sensitivity, accuracy and ruggedness. Others use it, too—but Perkin-Elmer keeps it cool and it does its best. With the TGS-1, data can be recorded simultaneously with the DSC. A derivative circuit for DTG is included. Moreover, with the UU-1 programmer you can have a completely independent TGA sys tem at moderate cost. The Model TMS-1 Precision Thermomechanical Analyser The "Archimedean Float" probe
The Model TGS-1 Thermogravimetric Analyser The unique low thermal mass inter nal furnace of the TGS-1 provides many user benefits. For instance: Close coupling with the sample for highest resolution, even at scan ning rates 10 or 20 times faster than normal with others. Complete isolation of balance from heat
suspension system on this model assures constant force on the sam ple, independent of displacement. This effectively eliminates tedious and inaccurate "probe position" adjustments. Moreover, the precision bear ings and massive " I B e a m " supports allow "stiction" free per formance. Together with unprece dented sensitivity in ordinary lab environments. The novel "Furnace Dewar" assembly rides up or down a verti cal "trolley" to surround or clear the sample area. No disassembly or complicated mechanical adjust ments are required. The TMS-1 includes a derivative circuit and a chromel-alumel thermocouple as standard features. (With the UU-1 programmer it is also available as an independent system.) To find out more about PerkinElmer's "unequal" (and superior) Thermal Analysis Systems, write to Instrument Division, Perkin-Elmer Corporation, 702 Main Avenue, Norwalk, Conn. 06852.
PERKIN-ELMER
Circle No. 134 on Readers' Service Card
ANALYTICAL CHEMISTRY, VOL. 41, NO. 14, DECEMBER 1969 ·119A
