Beckman® INSTRUMENTS, INC. - Analytical Chemistry (ACS

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is designed exclusively for the measurement of solution conductivity. Accuracy is ± 0.05% and sensitivity exceeds 0.005%. It houses, in one compact unit, an oscillator providing both 1,000 and 3,000 Hz bridge current, decade and ratio resistors that comprise the bridge, decade and continuously variable capacitors that facilitate reactive balance, a Wagner ground circuit, a sharply tuned high-gain amplifier, and a 2" CRT null detector. Range; 0-111,111 ohms and 0-11,111.1 micromhos; Readout: 6 decades in Resistance or Conductance units.

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is a general purpose unit featuring extremely wide range, high sensi­ tivity, and ± 1 % accuracy. This line operated bridge operates from a 120-volt, 50-60 Hz source. It is provided with a dual calibration in re­ sistance and conductance, covering the ranges 0.2 to 2,500,000 ohms, and 0,4 to 5,000,000 micromhos. When used with conductivity cells of appropriate cell constants (low for poorly conductive solutions and high for highly conductive solutions), the entire range of electrolytic con­ ductivity from ultra-pure demineralized water to concentrated strong acids is easily covered.

is a small, portable, versatile instrument for measuring solution con­ ductivity. Operating on internal battery supply or standard 115 VAC power, it provides six overlapping ranges for measuring resistance from 1 Ohm to 1.1 Megohms, and six additional overlapping ranges to measure conductance between 0.1 and 110,000 micromhos. Read-out for both measurements is digital, unambiguous and accurate to -± Vi%. The RC-19 also features bridge current frequencies of 100 and 1000 Hz, sensitivity better than 0.05%, solid state electronics and pro­ visions for interchangeable temperature compensators, both manual and automatic. The 10-lb, 1 1 " χ 9" χ 8" unit makes measurements equally well in grounded or isolated vessels or pipes, in lakes or streams and in the laboratory or plant.

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I N S T R U M E N T S , INC. CEDAR GROVE OPERATIONS 89 COMMERCE ROAD CEDAR GROVE, NEW JERSEY · 07009 (201) 239-6200 · TWX: 201-239-4704

For complete technical speci­ fications on any of our electro­ lytic conductivity bridges as well as our complete line of cells and associated equip­ ment write to ...

INTERNATIONAL SUBSIDIARIES: Geneva; Munich; Glenrothes, Scotland; Tokyo; Paris; Capetown; London. Circle No. 17 on Readers' Service Card 56 A

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ANALYTICAL CHEMISTRY, VOL. 4 2 , NO. 7, J U N E 1 9 7 0

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