Computer/data logging system

Instruments are provided to monitor the key process variables during plant operation. They may be incorporated in automatic control loops, or used for the manual monitoring of the process operation. They may also be part of an automatic computer data logging system. Instruments monitoring critical process variables will be fitted with automatic alarms to alert the operators to critical and hazardous situations. 

Manual control of the operation of a sulphonation plant can be supplemented by computer-based data logging. Such systems are non-interactive in that analogue and digital signals from the plant are fed to the computer/data logging system, but information is not fed back. Consequently, the status of pumps etc. and other data can be displayed on the screen-based mimics, reports can be printed and the data obtained can be manipulated to show trends or used in other off-line computer programs. 

To have the PSC under real time control of the algorithm, a computer controlled measurement system must be used. The one employed by Young consisted of an S-100 based data logging system with twelve bit analog-to-digital and digital-to-analog converter boards a power... 

Abstract— A Real-Time, Inexpensive Gait Analysis System that cost less than RM3,000 (= USD982) is proposed in this paper. The proposed system consists of subsystems such as wireless wearable accelerometer system, Custom-made force platform, data acquisition system with real-time computer data logging capability. Kinematics and kinetics parameters of human locomotion were collected and analysed by the system. The results collected were compared against published normative human gait data. Data collection was performed on 20 healthy test subjects without any reported gait-deflciency. 

Data recorders, or loggers, should be considered to be only safety related systems at best and viewed as operator aids, rather than systems qualified for safety duty. Data logging systems may be analogue or digital, and modem computer based systems can provide a comprehensive data analyzing and display facility. 

Output a built-in RS 232 C digital output provides a connection, if desired, to a printer or to data logging and computer systems, so both single-shot and continuous printout of pH, mV and temperature are possible. 

A micro computer system allowed voltage and current measurements to be synchronised plus data logging and averaging of measurements. Alongside each "measurement" foil was a "control" foil, coated with paint plus a protective epoxy coating, which did not corrode and allowed resistance measurements to be normalised. 

These prices are for the spinning disc reactor as just defined in points a to c, including advanced control and data-logging software with computer and flat screen. The following ancillaries are usually necessary for the system, and these may exist, or Triton can recommend units or can supply them integrated into the system. 

Computer Monitoring System. A data acquisition system is used to monitor and log 27 various measurements from the miniplant. The signals from the instruments are fed into an analog-to-digital converter, and the resulting digital signal is converted into an appropriate value based upon a scale factor for its respective instrument. 

A coordinated time base is essential. This simple requirement is not necessarily trivial on-board ship. Many analytical instruments and recording devices keep time by counting electrical cycles. This timekeeping method uses the excellent frequency control commonly found in U.S. electric power systems. At sea, however, frequency drifts, thus, clocks drift too. If all laboratory data were logged immediately into a computer data base, it would be relatively easy to coordinate computer time and real time. However, the situation can be confused when signals first go to strip-chart recorders for subsequent evaluation and then transfer to the general files. Provision then must be made for regular time marks on the chart. 

Sophisticated computer-based data monitoring systems may be installed, with which preventive maintenance is planned by trend logging (This type of system is commonly referred to as a building management system (BMS), building automation system (BAS) or system control and data acquisition (SCADA) system.)... 

To deduce a particle size distribution, the detector response must be deconvoluted by means of a simulation calculation. The scattering particles are assumed to be spherical in shape, and the data are subjected to one of three different computational methods. One system uses the unimodal model-dependent method, which begins with the assumption of a model (such as log normal) for the size distribution. The detector response expected for this distribution is simulated, and then the model parameters are optimized by minimizing the sum of squared deviations from the measured and the simulated detector responses. The model parameters are finally used to modify the originally chosen size distribution, and it is this modified distribution that is presented to the analyst as the final result. 

These records can be in the form of a log, computer data base or other appropriate documentation providing that the system can properly identify who was responsible for performing each function. 

In contrast to other studies, oxidation carried out in this department on a Pt/7-Al203 catalyst has not uncovered any oscillatory behaviour in the temperature range of 100-185 °C. Addition of a hydrocarbon like but-l-ene, but-2-ene, or propene induces sinusoidal or relaxation type oscillations at temperatures above 150 °C. The experimental set-up used consists of a continuous recycle reactor system. The catalyst is packed in the cylindrical tubes. The gas flow rates are precisely measured with a bubble flow-meter. The reactor outlet is connected to a magnetic deflection mass spectrometer. An electronic peak select unit allows up to four mass numbers to be continuously monitored. The output data are connected to a PDP 11/45 computer for automatic and fast data logging. The data thus stored in the computer can be analysed later. The line diagram of the experimental set up is given in Figure 1. 

Microcomputers are small dedicated computers which in general are single purpose computers. Some of the uses include analyzer control, controllers, flow measurement, data logging, and special mathematical functions. These systems are replacing some of the simpler minicomputer tasks which can be done more reliably and economically by microcomputers. They are not as flexible because they are designed for specific requirements. 

Programmable controllers are specific microcomputers that are designed to replace electromechanical relay logic systems. These instruments can be connected to computers for data logging or the computer may act in a supervisory capacity over the programmable controller. 

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