Engineering
The calculations you do during commissioning, on site and in design. Written by an automation engineer, with formulas and standards.
10 tools
- 4–20 mA scaling calculatorCurrent or voltage to process value and back, with square-root extraction and NAMUR NE 43.
- Modbus register to float converterTwo 16-bit registers to float, int32 and uint32 in every byte order.
- Pt100, Pt1000 and thermocouplesResistance to temperature and back for Pt100/Pt1000, and mV to °C for K, J, T, N, E, R, S, B thermocouples.
- PID tuning (Ziegler–Nichols)P, PI and PID settings from Ziegler–Nichols, CHR and SIMC rules, with a simulated step response.
- Cable voltage drop and sizeVoltage drop in a copper or aluminium cable, and the smallest size for an allowed drop.
- Ohm’s law and power (DC, 1- and 3-phase)Voltage, current, resistance and power from any two values. Active, reactive and apparent power in 3-phase systems.
- Electronics: resistors, divider, LED, RCResistor colour code, voltage divider, LED resistor, RC time constant and LC resonance.
- Pipe flow and pressure dropVelocity, Reynolds number, pressure drop (Darcy–Weisbach), pipe sizing and orifice plates.
- SI prefixes, significant figures, tolerance stack-upPrefix conversion (µ, m, k, M…), rounding to significant figures, and tolerance stack-up by worst case and RSS.
- Valve Kv and Cv calculatorKv and Cv from flow and pressure drop, flow through a valve, pressure drop and Kvs selection.
Where the data comes from
Thermocouples follow the NIST ITS-90 reference functions, Pt sensors IEC 60751 and cables IEC 60364. Each tool shows the formula it uses and its limits, so you know when the result is enough and when to check the standard.