Lutz NG10, Руководство пользователя

Страница: 9 / 36

9
0698-701 Relay module - 04/2021
en
Fig. 3 - Operating unit and flow meter
Fig. 4 - Relay module and protection cap
6. Modular Flow Meter System HDO
The flow meters of series HDO are oval gear flow meters. This has proven to be a reliable and highly ac -
curate method of measuring flow. Exceptional repeatability and high accuracy over a wide range of fluid
viscosities and flow rates are features of the HDO series flow meter design. The low pressure drop and high
pressure rating means the HDO series flow meter is suitable for both gravity and pump (in line) applications.
For practically-orientated application, the flow meter system is made up of various modules:
À
Operating unit
Electronic evaluating unit with touchscreen for operation of the flow
meter.
Á
Protection cap
Protects the modules basic flow meter, relay module or power supply
unit when the operating unit is decentrally installed.
Pulse converter
Amplifies the signals from the basic flow meter. Is required if the
signals need to be transmitted further than 5 m.
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.
Power supply unit
Supplies power to the operating unit when battery-powered operation
is not desired and when no relay module is needed.
Communication module
Is the interface to other management, control or process control
systems with different inputs and outputs.
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 oper-
ated.
Volume preset: The preselected volume is filled by pressing a key.
Volume preset is possible only when relay module
is connected.