Measuring system and method for measuring a mass flow rate, a density, a temperature or a flow velocity

16:

• A measuring system for measuring a mass flow rate, a density, a temperature or a flow velocity, the measuring system comprising:
• a main line;
• a first Coriolis measuring device arranged in the main line;
• a second Coriolis measuring device arranged in series with the first Coriolis measuring device in the main line;
• a bypass line which is configured to bypass the second Coriolis measuring device;
• a first valve arranged in the bypass line, the first valve being configured to open depending on a pressure;
• and
• a computing unit which is connected to the first Coriolis measuring device and to the second Coriolis measuring device,
• wherein,
• the first Coriolis measuring device is designed for a higher maximum flow rate than the second Coriolis measuring device.

20:

• The measuring system as recited in claim 16, further comprising:
• a pressure sensor arranged in the bypass line or in the main line, the pressure sensor being directly connected to the first valve or being connected to the first valve via the computing unit,
• wherein,
• the first valve is further configured to be adjustable depending on a pressure value measured by the pressure sensor.

21:

• The measuring system as recited in claim 20, further comprising:
• an electro-pneumatic transducer,
• wherein,
• the first valve is a pressure regulator which is configured to be adjustable via the electro-pneumatic transducer depending on the pressure value measured by the pressure sensor.

26:

• The measuring system as recited in claim 16, further comprising:
• at least one additional Coriolis measuring device having a different maximum flow rate than each of the first Coriolis measuring device and the second Coriolis measuring device,
• wherein,
• the first Coriolis measuring device, and second Coriolis measuring device, and the at least one additional Coriolis measuring device are connected in series, and
• the bypass line is further configured to additionally bypass the at least one additional Coriolis measuring device.

27:

• A method for measuring a mass flow rate, a density, a temperature or a flow velocity with the measuring system as recited in claim 16, the method comprising:
• in a first measuring range, in which the first valve is closed, using measured values of the second Coriolis measuring device with a lower maximum flow rate as output values of the mass flow rate, the density, the temperature or the flow velocity;
• in a second measuring range, in which the first valve remains closed and a flow rate and a pressure are greater than a flow rate and a pressure in the first measuring range,
• measuring and weighting measured values of the first Coriolis measuring device with the higher maximum flow rate and the measured values of the second Coriolis measuring device with a lower maximum flow rate as a function of a differential pressure of the second Coriolis measuring device so as to obtain weighted measured values of the first Coriolis measuring device and of the second Coriolis measuring device, and
• calculating output values for the mass flow rate, the density, the temperature or the flow velocity in the computing unit from the weighted measured values of the first Coriolis measuring device and of the second Coriolis measuring device;
• and
• in a third measuring range, in which the first valve is open and a pressure in the bypass line is higher than the pressure in the second measuring range, using the measured values of the first Coriolis measuring device with the higher maximum flow rate as output values for the mass flow rate, the density, the temperature or the flow velocity.