This fourth edition of a reference for process control engineers and students of instrument engineering covers both basic information and new developments in the field over the past decade. Emphasis is on measurement hardware, including the detection of flow, level, temperature, pressure, density, viscosity, weight, and composition. Each subchapter begins with a flowsheet summary and a feature summary, providing quick access to information on available sizes, costs, suppliers, ranges, and inaccuracies of devices covered in that section.