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- W80470079 abstract "than those permissible in other types of loop except for level. Once a properly implemented temperature loop is correctly tuned, the control error is often less than the tolerance (error limits) of the sensor. If one considers the accumulated error of an installed thermocouple or RTD system is about five times larger than the error limits of the sensor, one realizes system measurement error seriously limits temperature loop performance. Thermocouples and resistance temperature detectors In the process industry, 99% or more of the temperature loops use thermocouples or resistance temperature detectors (RTD). The RTD provides sensitivity (minimum detectable change in temperature), repeatability, and drift that are an order of magnitude better than the thermocouple, as shown in the table, “Accuracy, Range, and Size of Temperature Sensing Elements.” Sensitivity and repeatability are two of the three most important components of accuracy. The other most important component, resolution, is set by the transmitter. Drift is important for extending the time between calibrations. The data in this table dates back to the 1970s and consequently does not include the improvements made in thermocouple sensing element technology and premium versus standard grades. However, the differences are so dramatic that the message is still the same. T emperature is one of the four most common types of loops. While the other common loops (flow, level, pressure) occur more often, temperature loops are generally more difficult and important. It is the single most frequently stated type of loop of interest to users, and the concern for better control extends to the widest variety of industries. Temperature is a critical condition for reaction, fermentation, combustion, drying, calcination, crystallization, extrusion, or degradation rate and is an inference of a column tray concentration in the process industries. Tight temperature control translates to" @default.
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- W80470079 date "2010-01-01" @default.
- W80470079 modified "2023-09-24" @default.
- W80470079 title "Temperature measurement, control key to plant performance" @default.
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