Data acquisition computer

The other piece of mandatory equipment that has changed recently is the data acquisition computer. Previously, every inexpensive HPLC had to have a strip chart recorder. The price differential between a computer-generated annotated chromatogram and a strip chart has dropped to the point that it doesn t make sense not to have that capability in the lab. You may only integrate 1 run out of 10, but when you need it, the capability will be there. Try and avoid a computer system using a thermal or inkjet printer. The paper does not store well for a permanent record. Often, it will be necessary to photocopy the keeper chromatograms for further reference and archival storage. 

Monomer conversion has traditionally been determined gravitimetrically by drying emulsion samples to constant weight. The procedure is slow, requiring several hours for analysis, and precludes automated data acquisition. A new method has been developed based on the DMA-series digital densitometers manufactured by Anton Paar of Austria, and marketed in the United States by Mettier Instrument Corporation. (Very recently Dr. Kirk Abbey made us aware of his parallel work in these directions and of some initial data reported from his laboratory [1, 2]). This instrument is capable of immediate determination of the density of any test fluid, and, if equipped with a flow cell, can continuously monitor the density of a process stream. Results are displayed locally and can be transmitted digitally to a data acquisition computer. 

The state-of-the-art laboratories are equipped with the latest models of analytical instruments and computer systems, while others may have older, less sophisticated equipment or a mix of modern and outdated instruments. The goal of production laboratories is to analyze samples in the fastest possible manner. To be competitive, laboratories must have fully automated analytical systems allowing unattended sequential analysis of samples and computerized output of analytical results. Data acquisition computers, programmed with specialty software, control analytical instruments, collect the raw data, and convert them into analytical results. These computers are typically interfaced with the LIMS, which networks different laboratory sections into a single computer system and transforms analytical results into laboratory reports. 

Data reduction, verification, and reporting are always a combined effort of the personnel working in different laboratory sections, their supervisors, and the Data Management Section. Sample preparation technicians and analysts performing analysis are responsible for the correctness of their computerized and manual calculations and for proper reporting of the obtained results. Supervisors verify the correctness of these calculations during data review and approval process. The Data Management Section staff is responsible for the correct conversion of the data entered by hand or transmitted from the data acquisition computers into the LIMS and the production of finished laboratory reports prepared to client s specifications. 

Similar to GC instruments, HPLC instruments consist of an injection port, a separation column, a detector, and an instrument control/data acquisition computer. The use of liquid as a mobile phase influenced the design and construction materials of HPLC instrumentation elements. A sample extract or an aqueous sample is introduced into the separation column through an injection loop that can be programmed to receive various volumes of liquid (5 pi to 5 ml). 

Find the best lit that meets the initial calibration acceptance criterion (Tables 4.5, 4.6, and 4.7) program the data acquisition computer to use it for sample calculation... 

G. Gauglitz, R. Goes, Photokinetic evaluation by microprocessor controlled fluorescence data acquisition, Comput. Enhanced Spectrosc. 2 (1984) 159. 

Figure 5l6l Automated multifunctional high-throughput screening system (1) speetrolluo-rometer, (2) data acquisition computer (3) fiber-optic probe (4) combinatorial array (5) translation stage (6) in-line optical filter.

Thus the fluorescence signal at each measured X of the sample is multiplied by the correction fector at that X. Again this process can be easily achieved in the data acquisition computer. 

Signals are recorded with a 24 bit- 4 channels dynamic signals analyzer powered by the laptop data acquisition computer s USB port. 

Digital computer systems are used in I C systems important to safety to perform functions of protection, data acquisition, computation, control monitoring and display. If properly designed, they can offer the advantages of improved reliability, accuracy and functionality in comparison with analog systems. The computer system... 

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