Traditionally, process variables are considered to be units of flow, level, pressure, or temperature, and the media measured include gases, liquids, slurries, powders, and solids (see table).Transmitters are devices that accept the output of sensors and transducers designed to detect process variables and produce an output which directly or proportionally alters as process variables change.
Keynote Speaker Caspar Weinberger Stresses Security for Global Growth In his keynote address to the ISA TECH/97 crowd, former defense secretary Caspar Weinberger stressed security issues as a key in the growth of the global economy. Using the example of how the recent examples of the devaluation of Mexico's currency and the recession in Japan and it's effects on other countries, he stressed that events in one country 'ripples through the world quickly.' He also emphasized that the US' role in global security is vital to fostering global growth. Mr.