Computerised Temperature Measuring Systems Trends in Process Instrumentation In contemporary industrial processes, the measurement of temperature is one of the most frequently conducted operation among all of the other various physical variables that need to be measured. Current process instrumentation and measurement techniques show an inexorable trend in the use of a wide array of sophisticated procedures, including the capture and advanced algorithmic processing of multi-channel data. This trend is reflected in temperature measurement technology, so that typical temperature measurement circuits are now being replaced by computer-based data acquisition and processing systems | Temperature Measurement Second Edition L. Michalski K. Eckersdorf J. Kucharski J. McGhee Copyright 2001 John Wiley Sons Ltd ISBNs 0-471-86779-9 Hardback 0-470-84613-5 Electronic 13 Computerised Temperature Measuring Systems Trends in Process Instrumentation In contemporary industrial processes the measurement of temperature is one of the most frequently conducted operation among all of the other various physical variables that need to be measured. Current process instrumentation and measurement techniques show an inexorable trend in the use of a wide array of sophisticated procedures including the capture and advanced algorithmic processing of multi-channel data. This trend is reflected in temperature measurement technology so that typical temperature measurement circuits are now being replaced by computer-based data acquisition and processing systems. In general such a system comprises transducers transmitters measuring instruments indicators and recorders. In most systems this is also accompanied by process controllers supervised by a computer as shown in Figure . The set of all these elements is called the system hardware. The contents of this chapter is only devoted to the problems of temperature measurement using computerised methods as the problems of control are outside the scope of this book. The central part of a data acquisition system is a Personal Computer PC or work station in a typical industrial housing as shown in Figure which may also be Figure Block diagram of computer-based measuring and controlling system Figure Advantech Inc. IPC-610 personal computer in an industrial housing courtesy of Advantech Inc. 260 COMPUTERISED TEMPERATURE MEASURING SYSTEMS connected to a network. All the hardware elements are connected to the computer either by one of various standardised digital interfaces already described in Section or by specialised data acquisition cards plugged into the computer. The operation of the computer within .
