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Zero point
The amount of offset applied to all flow rates to enable
the flowmeter to read zero. All flow below this point is
considered negative flow.
Zero set calibration
A small adjustment to the zero point which may be
required to maximize accuracy at low flow rates
(Section 5.1). The two zero set calibration methods are
the zero flow set method and the manual zero set method.
Refer to Zero flow set calibration and Manual zero set
calibration.