Hysteresis
backwards). Hysteresis values are expressed as a percentage of the max. signal value (Figure H 31) . With measuring apparatus , a distinction is made between positive (increasing the value) and negative
Differential pressure gauge
Device that measures the difference between two pressures. This can be a pressure gauge with display or an electrical output. It can also be a device based on a or a piezoresistive system that either indicates
Sampling feedback control
Controller with digital signal processing during which the continuous change in the controlled variable is sampled in steps. For the processing it is necessary to change to discrete time operation. If
Control variable
is supplied via the measuring device of the . It is the output variable of the system and, together with the reference variable is the input variable of the controller ( Figure R 16 ).
Sealing set
Combination of several individual seals with a pressure ring and a support ring to improve the sealing action. Sealing sets are predominantly used in this form as rod seals. For piston seals in general
Automatic control
Control of a vehicle with hydrostatic drive by operating the pump as a function of the accelerator pedal for the combustion engine and therefore its rotation speed. Pulling away is therefore gentle and
Symbols
symbols, which display the function of a fluid device (not its construction design) in accordance with a standard or a key. The symbols were previously known as switching symbols. The symbols used in fluid
Pressure limitation
and the related power loss. Pump controls in hydrostatic propulsion systems are normally designed with pressure limitation.
Supply of a control unit
Entirety of all functional units to supply the technical control and feedback control devices with energy. The term supply can be more clearly specified by adding supplementary terms as a prefix according
Repeat accuracy (reproducibility)
expression of a random error, which arises if different testers want the same individual results with the same test methods and identical test materials.