PID tuning calculator
Compute PID constants from Lambda/IMC, Cohen-Coon or Ziegler-Nichols, in your controller's reset and rate units. Free, no signup.
Free tools
Converters and references. No signup, nothing stored.
FOPDT calculator
Estimate process gain, dead time and the time constant from a bump test: ΔOP, ΔPV, first movement, and time to 63%.
Bump test procedure
How to do a bump test on a control loop: what to record, what the response tells you, and a printable procedure. No signup.
Derivative units converter
Convert controller derivative time between minutes and seconds. Same factor-of-sixty trap as reset, without the direction flip.
Feedforward gain calculator
Compute the steady-state feedforward gain Kff = −Kd / Kp from the process path and the load path. Free, no signup.
PID algorithm form converter
Convert a tuning set between series (interacting), ideal (non-interacting) and parallel (independent) PID forms.
PID tuning cheat sheet
A PID cheat sheet and PID tuning cheat sheet for flow, pressure, level, temperature, speed and pH: typical structure, what usually goes wrong, and what to check first.
Proportional band and gain converter
Convert between proportional band percentage and controller gain in both directions. Free, no signup.
Reset units converter
Convert PID reset units between repeats per minute, minutes per repeat, seconds per repeat and repeats per second. Free, no signup.
Valve characteristic selector
Which valve trim characteristic suits your service, and what happens to loop tuning when the wrong one is fitted.