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Earthing

The term earthing covers all earthing equipment and measures and how they are used to connect an ...

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Eccentric

The term "eccentric" describes the state of being off-centre or out of symmetry.

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EC motor

EC stands for “electronically commutated” and characterises the commutation for this type of motor.

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Economic efficiency

Economic efficiency is the ratio between the measurable increase in value and the expenditure ...

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Eddy current sensor

When a conductive body is positioned in a magnetic field, eddy currents flow through this body due to ...

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Eductor-jet pump

Eductor-jet pumps are used if the water level on the suction side is too low for the suction lift ...

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Effective power

Effective power is the electrical power that can be converted to other mechanical, chemical or ...

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Efficiency

Efficiency (η) is generally understood as a ratio used to characterise the quality of power ...

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Efficiency class

All standard 2-pole and 4-pole low-voltage three-phase motors (e. g. asynchronous motor) with power ...

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Efficiency scale-up

Efficiency scale-up takes account of the influence of the Reynolds number (Re number) on the pump's ...

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Ejector

An ejector is a jet pump which creates a suction effect by generating negative pressure (see also ...

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Elastomer

An elastomer is a type of plastic with a fixed shape, but which can undergo elastic deformation. When ...

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Elbow

An elbow is part of the piping that changes the direction of a fluid by virtue of its curved shape ...

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Elbow casing pump

An elbow casing pump is a propeller pump whose diffuser discharges into an elbow (casing) rather than ...

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Electrical engineering

Electrical engineering is the area of physics that exploits the scientific knowledge of electricity ...

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Electrical power

Electrical power: Correlation between reactive power, effective power and apparent power

Electrical power (P) is the product of voltage and amperage (active current). The unit is watts (W). ...

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Electrical switchgear

An electrical switchgear is also referred to as a switchgear.

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Electric circuit

An electric circuit exists when electrical and electromechanical components combine to form a ...

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Electric filter

An electric filter as it applies to electrical engineering is a circuit that allows certain ...

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Electric fuse

The electric fuse is an overcurrent protective device that interrupts a circuit when current exceeds ...

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Electric motor

The electric motor is an electromechanical energy converter/drive that converts electrical into ...

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Electrochemical sensor

An electrochemical sensor is a sensor that uses an electrochemical reaction to take measurements (e. g.

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Electrochemical series

The electrochemical series helps to predict the outcome of an electrochemical reaction. This reaction ...

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Electromagnetic compatibility

Electromagnetic compatibility is abbreviated as EMC and describes the ability of an apparatus, a ...

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Electronically commutated motor

An electronically commutated motor is a synchronous motor that can be excited as a direct current ...

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Electronic fuse

An electronic fuse is an electronic protective device that automatically interrupts a circuit in the ...

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Electronic overload protection

Electronic overload protection emulates a thermal motor protection switch by using current ...

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Elevation

Elevation (z) refers to the geodetic height of a given point of a centrifugal pump or pump system in ...

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EMC

The term EMC is the abbreviation for Electromagnetic Compatibility.

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Emission

Within the context of the German Federal Immission Control Act, emissions shall mean the air ...

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Energy

Energy is a physical quantity and describes the ability of a body to perform work. In the technical ...

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Energy recovery

Energy recovery: Example of energy recovery in process engineering

Energy recovery describes the process of recovering the energy which has been used for the completion ...

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Enthalpy

Enthalpy is a thermodynamic property and is also called "heat content at constant pressure". It is ...

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Entropy

Entropy is a thermodynamic property and is a measurement of the disorder in a system. It is defined as:

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Environmental protection

According to the German Federal Immission Control Act, the term "environmental protection" is the ...

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Equilibrium

A fluid flow is in a condition of equilibrium if all parameters are constant over a defined period of ...

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Erosion

Erosion refers to a process whereby a flowing single-phase or multi-phase fluid attacks or removes ...

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Euler's equation

Developed by Leonhard Euler, Euler's equation is a mathematical model used to describe the flow of ...

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Evacuation

Evacuation refers to the rapid removal of contents. It generally relates to air that is present and ...

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Exit loss

The exit loss refers to the following head loss:

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Expansion joint

Expansion joints effect a degree of isolation for equipment installed in piping. Expansion joints ...

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Explosion

An explosion is a rapid exothermic reaction within explosive mixtures or an explosive atmosphere, ...

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Explosion hazard

An explosion hazard is a hazard that can occur when an explosive mixture is present at the same time ...

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Explosion protection

Explosion protection is concerned with avoiding the formation of hazardous gases, vapours, mists or ...

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