GB
8
Relay module and protection cap
A. General
The flow meter operates according to the positive displacement principle. In a housing fitted with inlet and outlet
is a measuring chamber through which the fluid is forced to flow on its way through the housing. In the measuring
chamber, a nutating disc blocks the fluid‘s clear path. As it flows through the measuring chamber, the fluid
pushes the nutating disc to one side. It is the action of displacing the impediment which produces the wobble
movement of the disc and circular motion of the nutating disc shaft. By means of a driver, a magnet with several
poles is set into rotation, which is able to activate a magnetically switched contact through the lid of the housing.
Every revolution of the nutating disc is assigned to a constant volume and a fixed number of pulses, so permitting
the electonic evaluating system to determine the volumetric flow through the number of received pulses.
For practically-orientated application, the flow meter system is made up of various modules:
À
Operating unit
Electronic evaluating unit with keypad and LCD display for operation of
the flow meter.
Á
Protection cap
Protects the modules basic flow meter, relay module or mains unit when
the operating unit is decentrally installed.
Â
Relay module
Switches the external electrical appliances such as pump motor and
solenoid valve and is controlled by the evaluating electronics of the
operating unit.
Mains unit
Supplies power to the operating unit when battery-powered operation is
not desired and when no relay module is needed.
Ã
Basic flow meter
Housing and measuring chamber with all components for volumetric
measurement which come into contact with the transported medium.
The flow meter can be used in two different operating modes:
Manual mode:
For filling using a manually operated nozzle. The
part volume meter is reset to zero and the required
volume is metered while the nozzle is being
operated.
Automatic mode:
The preselected volume is filled by pressing a key.
Automatic mode is possible only when relay module
is connected.
A. General
Operating unit and basic flow meter
Summary of Contents for 0212-100
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