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Temperature Controller - Staveb AG

Temperature Controller - Staveb AG

Temperature Controller - Staveb AG

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Glossary D-3Deviation: A departure of a controlled variable from a command such as setpoint.Deviation Indication: A system of indication in which a departure of adetected value from the set point is indicated.DIN (Deutsche Industrial Norm): A German standards agency that setsworld-recognized engineering and industrial standards.DIN 43760: The standard that defines the characteristics of a 100 Ω platinumRTD having a resistance vs. temperature curve specified by a = 0.00385 Ω perdegree.Drift: A gradual change over a long period of time that affects the reading orvalue. Changes in ambient temperature, component aging, contamination,humidity, and line voltage all contribute to drift.Droop: <strong>Controller</strong>s using only proportional control can settle at a value belowthe actual set point once the system stabilizes. This offset is corrected with theaddition of Integral control in the control algorithm.Electromagnetic Compatibility: To conform with CE’s EMC requirements,equipment or a system must operate without introducing significantelectromagnetic disturbances to the environment or be affected byelectromagnetic disturbances.Electromagnetic Interference: There are many possible sources forelectromagnetic interference (EMI) in an industrial control setting. It canoriginate as electrical or magnetic noise caused by switching AC power oninside the sine wave. EMI interferes with the operation of controls and otherdevices.Electromechanical Relay: A power switching device that completes orinterrupts a circuit by physically moving electrical contacts into contact witheach other. These are used primarily for ON/OFF control operation.Event: A programmable ON/OFF output signal. Events can controlperipheral equipment or processes, or act as an input for another control loop.Event input boards are an option for most Rockwell controllers.Fahrenheit: A temperature scale that has 32° at the ice point and 212° at theboiling point of water at sea level. To convert Fahrenheit to Celsius, subtract32 from °F and multiply the remainder by 0.556.Full Indication: A system of indication in which a detected value is indicatedwith a setting range.Publication 900-UM003C-EN-E - January 2004

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