Gauge protection valve
installed in the pipe to a pressure gauge which separates the pressure gauge from the pressure associated with the medium as soon as this exceeds a specified limit.
Frequency modulation
superimposing signals on a carrier wave on which the amplitude remains constant, but the frequency changes with the modulation. This includes above all the pulse modulation method .
Force measuring
Performed with the help of force sensors designed in such a way that the force introduced acts on a strain gauge bridge (two active and two passive strain gauges) upon compression.
Delay element
Elementary or parallel-connected transfer elements with additional time delays. They are marked Tk, where the index k states the order of the delay (according to Din 19 226 Part 2).
Telescopic connection
against one another and can be axially adjusted into one another. Telescopic connections are used with axially movable cylinders in place of hoses.
Arithmetic mean, average
The arithmetic mean or the average of a series of measurements with n independent individual values x, 1 ... x n, termed x̄ for short, is defined by (VDI-VDE 2600).
Modular design
This is when functional units or even physical units are associated with a defined type of behaviour and can be linked together based on defined rules (EDIN 19 226, Part 5).
Rotary valve
Valve with a rotating shaft as the control element that houses the control bores (Figure D 39) . Rotary valve are only used infrequently because their actuation is difficult to automate.
Gap bridging
Ability of elastomer seals to bridge a gap with their spine, without being squeezed in ( gap extrusion ). The gap bridging depends on the type and hardness of the material.
Twin filter
Combination of two filters with a control unit so that the entire flow rate can be passed through one of the two filters while the other can be cleaned. (Figure D 32)