Acceleration measurement
Is undertaken using sensors that determine the acceleration of an element of a machine. This measurement is made using either seismic (inductive) sensors (Figure B 12) or using force sensors based on
Variable pump, variable motor
Displacement machine in which the geometric displacement per cycle can be changed. For design-based reasons, this is only possible for vane and piston constructions. Variable pumps can be adjusted fro
Programmable logic controller (PLC)
Control whose program is stored in a program memory. The functional elements necessary to process the program and their connections are regarded as factors that cannot be altered. PLCs may be equipped
Flow coefficient Kv (Kv value) of a valve
Defines the quantity of water in m3 (L) that flows through a valve in one hour (minute) with a pressure drop of 1 bar (VDI 2173). The Kv value is therefore a parameter for the selection of valve sizes
Drift
Unintentional change in a measured signal due to the effect of a external variables that change over time, e.g. temperature drift.
Digital input step
Change in the input variable that changes the output variable by the smallest digital step (1 D = 1 Digit).
Covering plate
Plate for covering valve stations on a group plate (stacked plate). They are used if an additional device is to be fitted later.
Trigger signal
Triggers the control process. It can be provided manually or by a process variable. In relation to its magnitude and its change over time, agreement is required in both cases (DIN 19 226).
ASCII
Abbreviation for American Standard Code For Information Interchange. ASCII codes represent characters. Computers require a code to display characters on the screen or to save them. The most widespread