Limit switch
Contact pressure gauge ). A differentiation is made between Direct limit switches : that as rule operate with spring contacts to keep the contact wear as low as possible, Indirect limit switches : that as a rule
Digital pump
used infrequently these days. Instead the easier to use but also more expensive variable pump is used with a delivery flow that must be equal to ΣQ n.
Filter pores
irregular arrangement of fibres that are often of varying thickness (Figure F 17) . For this reason with tissue filters it is only possible to achieve a particle distribution, as given in the contamination
Control diagram
diagram for straightforward systems is normally integrated into the function diagram in accordance with VDI 3260 and is only designed as an independent diagram for highly complex systems.
Analogue data acquisition
recording of measured values must be sufficiently accurate to satisfy the requirements associated with their further processing. This is particularly true of measuring in , since errors occurring between
Safety gate valve
fluid when the gate is open. The safety gate valve is designed as a pilot-controlled seated valve with a switching movement that is electrically monitored when activated mechanically .
Inflatable seals
(Figure A 24) . Example: Sealing test specimens in pipe test presses or shaft sealing in conjunction with sliding ring seals .
Idle circulation valve
Valve with the task of switching circulating the pump flow rate back to the container without pressure if it is not needed. In order to keep power losses low in doing so, this takes place on the shortest
External power split
Gearboxes with an external power split comprise a mechanical summation gearbox (planetary gearbox) in the direct flow of power and an adjustable gearbox (hydrostatic transmission) in the parallel circuit
Bode diagram (frequency characteristics)
. Based on the Bode diagram for a controlled subsystem it is straightforward to find a controller with which a stable control circuit can be assembled.