DEVICE FOR MEASURING MASS FLOW

1. Apparatus for measuring the mass of a fluid stream comprising a measuring device containing a differential pressure sensor, and a circuit arrangement for processing the measuring signal coming from the differential pressure sensor, where the circuit arrangement comprises a computer (4), a recording component (16, 17) for recording the calculated mass of the fluid stream, a control component (20) for simulating measured values in a test run and a control component (25) for the measuring operation ; and where the control component (25) for the measuring operation is coupled to the control component for the test run in such a way that a measuring operation can in each case only be carried out after a preceding test run, characterised in that the circuit arrangement includes a component for maintaining the measuring operation operating state during an interruption of this operating state due to disturbance.