Open the box, remove, install, and electrically connect the instrument, start the flow expecting to have accurate reading and control and...what's this?  It's not working!

Proper installation and start up of a coriolis instrument includes zeroing the meter before usage.  Zeroing the meter, with the unit full of fluid and a no flow condition, allows the meter to "know" the zero point.

Due to mechanical construction of the sensor tubes each Coriolis sensor will have a very small offset signal, even when the mass flow is zero. This is called the zero-stability error and is specified for accuracy separately for all Coriolis instruments. This error can be neutralized after performing a zeroing procedure.

Each time process conditions have been changed significantly a CORI-FLOW needs to be zeroed in order to get rid of the offset error due to zero-stability. At the very least the first time an instrument is used a zero procedure will be required.

In short, for proper measurement you must zero the Coriolis instrument.