Measuring device for metering fluids, and method for metering by means of a measuring device of this type

A method of metering a fluid, the method comprising:

• providing a measuring device comprising:
• a container in which the fluid is stored;
• a fluid inlet which is fluidically connected to the container;
• a fluid outlet which is fluidically connectable with a metering point;
• a metering line which connects the fluid inlet with the fluid outlet;
• a delivery pump arranged in the metering line;
• a density sensor arranged in the metering line;
• a flow meter arranged in the metering line;
• a recirculation line which is arranged to branch off from the metering line downstream of the flow meter and to open into the container;
• a shut-off valve;
• a temperature sensor;
• and
• a fluid recirculation valve which is arranged in the recirculation line,
• wherein,
• the flow meter is arranged in a measuring unit housing which is arranged at a distance from a pump unit housing in which at least the delivery pump is arranged,
• the pump unit housing is detachably connected to the measuring unit housing via a connection portion of the metering line, and
• the shut off valve is arranged in the measuring unit housing downstream of the flow meter in the metering line and upstream of the fluid outlet;
• providing a fluid in the container of the measuring device;
• recirculating the fluid via the metering line and the recirculation line;
• discharging the fluid in a lower region of the container;
• returning the fluid to an upper region of the container;
• and then
• metering the fluid at the metering point;
• opening the fluid recirculation valve;
• closing the shut-off valve in the metering line in the metering unit housing;
• conveying the fluid in a circuit via the delivery pump until a temperature of the fluid at the temperature sensor is constant, and then
• switching off the delivery pump and closing the fluid recirculation valve, and then,
• switching on the delivery pump, opening the shut-off valve, and metering the fluid at the metering point while measuring a mass flow via the flow meter.

A measuring device for metering a fluid, the measuring device comprising:

• a container in which the fluid is stored;
• a fluid inlet which is fluidically connected to the container;
• a fluid outlet which is fluidically connectable with a metering point;
• a metering line which connects the fluid inlet with the fluid outlet;
• a delivery pump arranged in the metering line;
• a density sensor arranged in the metering line;
• a flow meter arranged in the metering line;
• and
• a recirculation line which is arranged to branch off from the metering line downstream of the flow meter and to open into the container,
• wherein,
• the flow meter is arranged in a measuring unit housing which is arranged at a distance from a pump unit housing in which at least the delivery pump is arranged,
• the pump unit housing is detachably connected to the measuring unit housing via a connection portion of the metering line,
• the metering line is arranged to extend upwardly from the fluid outlet, and
• the shut-off valve and the throttle are each arranged in an upwardly extending portion of the metering line.