Coriolis flowmeter with zero checking feature

Abstract

Descriptions are provided for implementing flowmeter zero checking techniques. In operating a flowmeter, it may be the case that, even if previously calibrated, the flowmeter will produce erroneous measurements, e.g., will indicate a non-zero flow during a period of zero flow. Therefore, zero checking features are provided that allow for fast and accurate determinations of the zero-flow values, for use in adjusting later measurements. The zero-checking features include a button attached to an exterior of a flowmeter, so that it is easily accessible to an operator of the flowmeter. The button, in conjunction with an internal zero checking system, allows for a display of a zero value in response to a request from the operator of the flowmeter.

What is claimed: 
     
         1 . A system for calibrating a flowtube, the system comprising:
 a transmitter configured to induce motion in a flowtube containing fluid, the transmitter comprising:
 a contact input, 
 a zero-checker module configured to determine a calibration value based on the motion of the flowtube over a pre-determined time period, and 
 a measurement module configured to determine a property of the fluid based on the motion of the flowtube; and 
   a switch configured to activate the zero-checker, the switch coupled to the transmitter through the contact input.