New Products
FREE 12-page catalog for users of PRECISION COMPONENTS for ANALYTIC INSTRUMENTATION
Digital Voltmeter Model 3462A virtually eliminates circuit loading errors on high im pedance devices because of the instru ment's near infinite input resistance. The high input resistance, >10 1 0 ohms within 5 % of null on the 1 and 10 volt ranges, makes the voltmeter's ac curacy available for measurements on difficult-to-measure devices. Voltage ranges of Model 3462A are 1, 10, 100, and 1,000 volts full scale, selected manually, automatically, or by remote control. Accuracy is ±0.004% of read ing + 0.0002% of full scale and is specified for 90 days and for a tempera ture range of 20 to 30 °C. The volt meter has a six-digit readout plus a seventh digit for allowed 20% overranging on all ranges. This six-digit resolution results in Ι-μΥ sensitivity on the one volt range. Hewlett-Pack ard Co., 1501 Page Mill Rd., Palo Alto, Calif. 94304 422
For liquid
chromatography
T W O NEW MICRO-COLUMN LC DETECTORS » » • •
High Sensitivity Small Cell Volume Minimum Drift Low Cost
uv Monitor —
Digital Multimeter
a full line of
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CONTROLLERS
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REGULATORS
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FLOWMETERS
D VALVES
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If you work with analytic in s t r u m e n t a t i o n , y o u should have our new 12-page catalog. In it you will find a complete line of precision components specifically designed for this specialized field. This catalog gives you the spe cifics that you want . . . figures, facts and photos. Learn more about Brooks pre cision components! write for your free copy today!
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BROOKS I N S T R U M E N T DIV. EMERSON ELECTRIC CO. HATFIELD, PENNA. 1 9 4 4 0
EMERSON sales engineering offices in cities throughout the world
principal
Circle No. 39 on Readers' Service Card
Model PM2421 makes readings as low as 10 microvolts and 10 pico amperes. The operator selects the basic measuring range and then the in strument automatically selects one of three subranges that displays the read ing with best resolution. Appropriate corrections are made automatically in the decimal point placement. Direct current voltage measuring capability spans the range of 10 microvolts to 1000 volts; maximum on ac is 500 volts RMS. The multimeter reads dc and ac current between 10 picoamperes and 1.400 amperes, and resistances from 0.01 ohm to 1400 megohms. Maximum resolution is 10 picoamperes in the 14.00 nanoampere range, and 0.01 ohm in the 14 ohm range. Direct current voltage readings are accurate to 0.1% ± 1 digit, with a maximum resolution of 10 microvolts in the 14.00 millivolt range. Philips Electronic Instruments, 750 S. Fulton Ave., Mount Vernon, Ν. Υ. 10550 423 Clot Time Recorder The Electra 500 automatically per forms all routine coagulation proce dures in which the end point is the de tection of fibrin formation in serum or plasma. When coagulation occurs, change in light transmission is photo metrically sensed, stopping the electric digital timer which is coupled to a pa per tape printer. Results are printed opposite the tube identification num ber. The Electra 500 refrigerates and heats reagent, dispenses it, performs tests, and prints results for up to 50 samples. Scientific Products, 1210 Leon Place, Evanston, 111. 60201 424
a new ultraviolet
spectrophotometer
ûv Monitor — detects ultraviolet absorbance of one stream or differential absorbance between two streams. Double beam linear absorbance readout at 254 mu. .02 to .64 Optical Density units. Drift less than .0002 O.D. per hour. Minimum full scale range .02 O.D. Minimum detectable absorbance .0001 O.D. Request Bulletin 692. refractoMonitor — detects differential refractive index in 1 χ 10~6 Rl unit range at room temperature — no temperature bath needed. Drift less than 1 χ 10-6 R|/hour at room temperature. Cell volume is 3 microliters. Solvent index ranges 1.30 to 1.55. Ideal for high speed columns. Request Bulletin 691. Micro column kit — includes three precision bore glass columns 1, 2, 3 mm I.D., each 36" long, with one set 316 stainless steel top and bottom column fittings — featuring low dead volume, solvent reference fitting and Teflon/Silicone rubber septum with needle guide. All connections 1/16" O.D. 316 SS capillary tubing. Complete cost $99.50 each. It will pay you to investigate this new, advanced line of micro column LC detectors and kit. Write today for complete technical data and prices.
LABORATORY DATA CONTROL 42 Shelter Rock Road, Post Office Box 1030 Danbury, Conn. 06810
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(203) 744-5322
Circle No. 31 on Readers' Service Card
VOL. 4 1 , NO. 8, JULY 1969 • 91 A
