Kuse and Takahashi (2000) investigated the transient response of a tin oxide semiconductor RH sensor exposed to step changes in RH.
For all tests, the test sensors were exposed to step changes in RH between 20% and 40%.
To study the effects that temperature variations had on the sensors for a given step change in humidity, tests were conducted for step changes in air temperatures (dry-bulb) of 0[degrees]F (isothermal), 9[degrees]F, and 18[degrees]F (0[degrees]C, 5[degrees]C, and 10[degrees]C).
Because a range of duct air velocities and two different temperature step changes were considered in this study, a more general analysis is provided by considering the time constants of each sensor ([[tau].
While the industry is so busy, incorporating these step changes is one job you put further down the deal-with-it-later pile.
With the industry so busy at the moment is it really feasible to create a step change and provide clients with what they want?
With only one set of parameters, PI controller will control the system with them, no matter how big the step change is required from the system.
These sets of parameters should control the system after the system response to a step change of the control signal reaches one third of the step change value.
It is evident from this table that parameter KR will change with every different step change in a way that with a greater step change the difference between value of parameter KR calculated in (9) and new value of KR would be bigger.
Since the difference between values of parameter KR is bigger when the value of the step change is greater, it is obvious that two sets of parameters should be used when a greater stationary state change is required.