New Products
MEASURE
THE AUTOOR CROSS CORRELATION FUNCTIONS
OF ANALOG OR DIGITAL SIGNALS with the Langley-Ford Instruments Models DC-64 and DC-128 Correlators. Apply this new, versatile technique to research applications such as: • photon correlation spectroscopy • laser anemometry • noise and vibration analysis • stimulus response studies • pulse echo ranging • signal averaging • air pollution monitoring • combustion analysis
Horiba PIR-2000 is a system for measuring total organic carbon using glass ampules and wet oxidation technique. Up to 10 mL of sample are placed into a borosilicate ampule with an oxi dizing agent and phosphoric acid. Inorganics are purged, and the ampule is sealed and then autoclaved to convert the organics to C0 2 . The C0 2 is measured with an infrared analyzer. Sensitivity is 100 ppb. Precision is ± 5 % of actual value at 1 ppm, and approximately 2% of actual value at 5 ppm and above. Oceanography International 405
Dual Bed Gas Purifier
UV-VIS Spectrophotometer
The DBP-25 dual bed hydrogen purifier combines the function of an oxygen/ hydrogen recombiner and a molecular sieve dryer in a single chamber. At flows below 25 SCFH, the unit will re duce 1 % oxygen in hydrogen to less than 1 ppm. Water vapor is removed to below 1 ppm by a bed of molecular sieve below the catalyst. Under normal circumstances, a fresh DBP purifier will treat 12 to 25 200 SCF hydrogen tanks containing 100 ppm total oxygen and water before it requires regeneration or replacement. Resource Systems, Inc. 428
The microcomputer controls all func tions of the Model 559 UV-VIS spectro photometer. Repetitive scan, wave length programming and 1st and 2nd derivative are standard. The built-in flowchart recorder automatically posi tions to the paper grid line and allows for accurate serial and overlay presen tation. A holographic grating is utilized by both the high performance version and the standard version, which have stray light of less that 0 . 0 0 2 % Τ and less than 0.05 % T , respectively, at 220 nm. Perkin-Elmer Corp. 408
Sample Introduction in Flame AA
The pulsed microelectrode features in terchangeable solid gold, platinum, and glass carbon tips to permit polarographic analysis of materials with dif fering overpotentials. The piston action electrode also allows modeling of elec trochemical processes, including elec tro-organic synthesis. The microelec trode, which fits any vessel with a 14/20 joint, is pulsed 1/4 inch into the test solution at rates of 0.1 to 6 pulses/ s with variable intensity control. A pulse controller is available optionally. Pulsed microelectrode, $ 5 2 1 ; pulse generator, $ 5 2 1 . ECO, Inc. 417
Microelectrode
Automated multiple flow injection anal ysis (AMFIA) entails insertion of dis crete micro volumes of liquid sample into a constantly flowing solvent stream which is pumped directly into the nebu lizer of a flame atomic absorption spec trometer. This allows analysis of dis crete micro volume samples and a speed of 120 to 180 samples per hour. The modular-type units of the AMFIA MARK CHEM. FAAS can be adapted to your present AA. Mark Instrument Co. 422
LFI correlators offer features such as: • 64 or 128-channel correlation capability • 50 msec to 100 nsec sample time • easy interfacing with computers meeting IEEE488 specs • 4-bit correlation • encoding of all control settings into output record • precomputation delay LFI correlators have earned a reputation for ease of use, reliability and trouble-free operation in industrial and university laboratories worldwide. And to buttress this reputation, LFI correlators are sold and serviced by EG&G Princeton Applied Research Corporation, renowned internationally •or the distribution of sophisticated signalrecovery measurement devices. For full details on the LFI Models DC 64 and DC-128, write or call: Langley-Ford Instruments, 85 North Whitney St., Amherst, MA 01002 413/256-8147
LANGLEY FORD INSTRUMENTS CIRCLE 130 ON READER SERVICE CARD
ANALYTICAL CHEMISTRY, VOL. 5 1 , NO. 13, NOVEMBER 1979 ·
1363 A
