4-20 mA loops, RTDs and thermocouples, orifice plates, RS-485 and Profibus networks and PID tuning.
Check whether the supply can drive a 4-20 mA loop with cable, 250 Ω receivers, barriers and indicators up to the NAMUR NE 43 alarm current, and scale mA to engineering units, with square root for flow.
Load, lift-off, cable, NE 43Convert temperature to Pt100 and Pt1000 ohms (Callendar-Van Dusen) or to K, J, T, E, N, R, S and B thermocouple mV (ITS-90), and back, with cold junction, class tolerances and 2-, 3- and 4-wire lead error.
Ohms, mV, cold junction, classesSize an orifice plate per ISO 5167-2 for liquid or gas: β and bore by iteration with the Reader-Harris/Gallagher equation, expansibility, validity limits, permanent pressure loss and Table 3 straight lengths.
β, C, ε, straight runs, ISO 5167Check an RS-485 network: maximum segment length by baud rate (TIA-485-A and the Profibus DP table), devices per segment, repeaters and terminators, and Modbus RTU scan time from the bytes of each function.
Length, nodes, scan timePaste the reaction curve from an open-loop test, fit a first-order-plus-dead-time model and compute P, PI and PID by Ziegler-Nichols, Cohen-Coon and lambda, in ideal and parallel forms, with the simulated response.
Reaction curve, ZN, lambdaImportant notice: Indus Metrics tools produce estimates and pre-sizing results from the data you enter and from published engineering methods. They do not replace design, calculations or reports signed by a licensed professional engineer (PE), nor verification against the applicable codes, standards and regulations, such as OSHA rules and the ASME codes. Material and fuel properties vary: check manufacturer data or your own process analyses before deciding. By using this site you agree to the Terms of Use.
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