NEW PRODUCTS Analytical Instruments To aid in the teaching of analytical chemistry, a compatible system of mod ular components has been designed. Each module can perform one particu lar function and can be interconnected with other modules as required to form a complete instrument. Electronic units make use of transistors and other solid state devices wherever possible. The individual units available include current source, timer, voltage source, audio oscillator, potentiostat, d.c. am plifier, d.c. meter, recorder, electrom eter, Wheatstone bridge, thermistor probe, pump, and optical absorptiometer. These units may be as sembled to permit conductometric, potentiometric, or coulometric titrations, for example. A. R. F. Products, Inc., Raton, Ν. Μ. 410
high temperature measurement problems?
Model 61, $195
new YSI telethermometer
MEASURE A NANOVOLT! The new Keithley 148 Nanovoltmeter provides the most dc volt age sensitivity, highest stability and lowest noise of any commer cially available voltmeter. The 148 has 1 % accuracy at the out put terminals, input impedance of 1000 ohms on the 10"» volt range rising to 1 megohm on the 10" 3 volt range, front panel zero suppression and amplifier gains up to 108. Applications include measur ing outputs of thermocouples;
• $1275
A new electrophoresis apparatus for use with paper strips consists of a power supply providing either con stant d.c. voltage (0 to 500 volts) or constant current (0 to 100 milliamperes); separate double range meters which show current and voltage; and an electrophoresis cabinet (shown above). With this equipment, sharp separation of migrating components of normal human serum on paper is accomplished in about 6 hours (250 volts); the entire procedure may be completed in 7 to 11 hours, depend ing on technique. The company also supplies accessories for starch gel and agar gel electrophoresis. Arthur H. Thomas Co., Vine St. at 3rd, P. 0. Box 779, Philadelphia, 5, Pa. 411
Send for New 148 Engineering Note
Far Infrared Spectrophotometer
other microvoltmeters
The Fourier spectrophotometer Model FS-520 uses an interferometer adapted for far infrared operation. The arrangement overcomes some of the main defects inherent in conven tional far infrared spectrometers by efficient use of the available energy, and by giving spectra over a very wide frequency range in one scan (10-500 c m . 4 ) . This instrument is available with many accessories. Limit Research Corp., 557 Post Rd., Darien, Conn. 412
the 10' 6 ohm range; conducting Hall Effect studies and use as a null detector. • 10 n a n o v o l t s (10·«ν) f u l l scale sensitivity • 10 nanovolts per 24 hours stability • 1 nanovolt noise, peak-to-peak • 3000:1 line frequency rejection • line or rechargeable batteries
Model 149 Ο.ΐμν sensitivity $895 Model 150A Ιμν sensitivity $750 Model 151 ΙΟΟμν sensitivity $420
Κ KEITHLEY I N S T R U M E N T S 12415 Euclid Avenue · Cleveland 6, Ohio Circle No. 49 on Readers' Service Card
128 A
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ANALYTICAL CHEMISTRY
. . . a multi-range thermistor based tele-thermometer for high temperature measurements in laboratory, research and industrial areas. Calibrate different probes in less than a minute. Direct reading meter accurately monitors high t e m p e r a t u r e surfaces, semi-solids, liquids and gases in seconds. METER SCALE PLATE (Half Size) «0
440
Accuracy is ± 3 ° F over most of range. Read ability and reproducibility better than 1°F.
The Model 61 is battery operated and completely portable. Convenient re corder jacks provide 0-160 MV full scale output. The full line of YSI Telet h e r m o m e t e r s includes single and multi-channel instruments for precise t e m p e r a t u r e m e a s u r e m e n t s from - 1 1 0 ° to +500°F. For complete specifications and details write:
YELLOW SPRINGS INSTRUMENT CO.. INC. Mow Springs, Ohio
Circle No. 188 on Readers' Service Card
