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Mag-drive pump

Mag-drive pumps are seal-less pumps whose shaft torque is transmitted via a magnetic coupling drive ...

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Magnetic coupling

A magnetic coupling can be used to transfer power to centrifugal pumps. It consists of a primary part ...

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Magnetic field measurement

Magnetic field measurement determines the effect of a magnetic field on solids for e.g. distance ...

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Magneto-elastic measurement

Magneto-elastic measurement determines changes in magnetic permeability for e.g. torque or force ...

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Mains voltage

The mains voltage is the electrical voltage supplied by utility companies via the power grid to ...

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Maintenance

Maintenance refers to checks, inspection and care required to be regularly performed in defined ...

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Maintenance contract

In technical language, a maintenance contract is also referred to as an inspection contract. It is ...

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Manufacturer's Declaration

In accordance with the revised version of the Machinery Directive (2006/42/EC) dated May 2006 a ...

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Manufacturing execution system level

The manufacturing execution system level is the level of the automation system at which decisions ...

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Manufacturing tolerance

The manufacturing tolerance is the level of deviation from the values guaranteed in the acceptance ...

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Marine pump

Marine pump: Axially split vertical marine pump

Marine pump is a collective term for all pumps complying with the relevant regulations issued by the ...

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Mass

Mass is a basic physical quantity of which the SI unit is the kg (kilogram).

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Mass flow rate

The mass flow rate (m · ) is the rate at which mass flows through a reference cross-section per unit ...

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Master

The master is the central bus node and controls access to the bus in a communications system. All ...

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Master/slave mode

Master/slave mode: Centrifugal pumps with integrated intelligent drive

The master/slave mode is used for hierarchically managing the access rights of common resources in a ...

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Material

Of the multitude of available materials, metallic and non-metallic (such as plastic and ceramic) ...

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Material selection

When selecting the material for certain pump components, it is particularly important to have a ...

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Measurand

The measurand, or measured quantity, is the physical quantity in metrology subject to measurement.

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Measured value

A measured value is the value of a measurand provided by a measuring instrument or measuring device.

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Measurement accuracy

In metrology, it is generally not possible to take error-free measurements, since many factors ...

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Measurement error

Measurement errors, or errors of measurement, are also referred to measurement deviations.

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Measurement pick-up

A measurement pick-up is also referred to as a sensor.

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Measurement uncertainty

Measurement uncertainty as defined by DIN 1319, page 3, encompasses the random errors of all ...

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Measuring instrument

The measuring instrument provides the measured value of a measurand and is used in metrology ...

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Measuring orifice

A measuring orifice is also referred to as a standard orifice or simply an orifice and is used for ...

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Measuring range

The measuring range is the range of measured values for a measurand in which defined, agreed, or ...

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Measuring range limit

The measuring range limit is frequently the reference value for calculating the error limit from the ...

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Measuring sensor

A measuring sensor is also referred to as a sensor.

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Measuring span

The measuring span is the difference between the upper and the lower measuring range limit and is ...

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Measuring tolerance

The term measuring tolerance is associated with measurement uncertainty and describes a range in ...

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Measuring transducer

A measuring transducer is a measuring instrument (also see Sensor) that incorporates ready-to-use ...

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Mechanical drive

Mechanical drives use couplings or belt drives to transmit torque (also see Drive).

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Mechanical efficiency

Mechanical efficiency (ηm) is described as the ratio between the power input (P) minus the mechanical ...

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Mechanical power

Mechanical power (P) is the quotient of mechanical work (A) by time (t). The SI unit of measurement ...

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Mechanical seal

The mechanical seal employs a contact-type design to seal the centrifugal pump's shaft where it ...

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Mechatronics

Mechatronics encompasses mechanical, electronic, and IT-related components. The term is derived from ...

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Medium-pressure pump

The term medium-pressure pump means a centrifugal pump with a head between 80 and 200 m, as in ...

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Mercury pump

A mercury pump transports mercury in chlor-alkali electrolysis processes based on the mercury cell ...

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Meridional section plane

The meridional section plane is a section through the centre of rotation of an impeller.

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MES

MES stands for Manufacturing Execution System. In a production control system, this term refers to ...

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Metal-to-metal seal

The metal-to-metal seal is a seal type which can be used under high temperatures and pressures (e. g.

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Metrology

Metrology encompasses all measures for determining the status of physical quantities and leverages ...

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Mid-point conductor

The mid-point conductor is a neutral conductor found in a single-phase alternating current system.

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MIF

MIF stands for "Magnetic-Inductive Flow Measurement" and is also referred to as "Inductive Flow ...

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Miniature circuit breaker

A miniature circuit breaker is an overcurrent protective device. It protects an electrical circuit ...

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Minimum flow rate

The minimum flow rate describes the lowest possible flow rate to be maintained in order to prevent ...

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Minimum positive suction head

The minimum positive suction head describes the suction head required in order to ensure proper ...

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Mixed flow

The term "mixed flow" describes a direction that is halfway between axial (along the axis) and radial ...

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Mixed flow impeller

The mixed flow impeller is also referred to as a helical or diagonal impeller; it transports the ...

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Mixed flow pump

Mixed flow pump: Volute casing pump with open mixed flow impeller and vortex volute

A mixed flow pump is a centrifugal pump with a mixed flow impeller. The specific speeds (ns) lie ...

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Mixer

Mixers are blending devices used in process engineering. Mixers consist of the following components:

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MOD Bus

The MOD bus is a technical solution for a communications system in a master/slave network (see ...

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Model Testing

In cases where technical or economic factors (for example size, rotational speed and material/fluid ...

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Moment of gyration

The moment of gyration represents a characteristic magnitude for "rotational inertia"of a rigid body, ...

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Moment of inertia

The moment of inertia (J) is often used instead of moment of gyration (mD2). The unit kg/m² is used ...

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Monitoring

Monitoring involves detecting the condition of components, e.g. within the context of process ...

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Motion control

Motion control refers to the process of controlling drives to coordinate movements in a machine or plant.

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Motive flow

The motive flow is the volume flow used in conjunction with eductors; the fluid drives the effective ...

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Motor protection

Motor protection is the collective term used for all measures designed to protect electric motors and ...

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Motor protection relay

The motor protection relay is also referred to as overload relay and operates on the same principle ...

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Motor protection switch

The motor protection switch protects a motor from overload and failure of an external conductor by ...

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Multistage pump

Multistage pumps are defined as pumps in which the fluid flows through several impellers fitted in ...

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