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       according to the different characteristics of various types of instruments, such as function, measurement and control objects, structure and principle can be subdivided into a number of categories or sub-categories. such as industrial automation instruments instrumentation can be divided according to the functions, loop display instrument, control instrument and actuators; which instrumentation measured physical quantity is divided by the temperature measuring instruments, pressure measurement instruments, flow measurement instruments, level measurement instruments and mechanical measuring instruments and other; temperature measurement by the measurement method is divided into contact and non-contact thermometer thermometer; contact thermometer can be divided into thermoelectric expansion, resistive and so on.