float flow meterThe determination of accuracy requires comprehensive consideration of the characteristics of the instrument itself, the working conditions of the medium, installation conditions, and calibration methods. The following is a specific description of the nominal accuracy:

1、 The nominal accuracy of a float flowmeter

1. Classification of accuracy levels

The accuracy level of a float flowmeter is usually calibrated by the manufacturer according to international standards such as ISO 5167 and GB/T 12236. The common levels are as follows:

example
If a 1.5-level float flowmeter is selected with a range of 0-100 m ³/h, the measurement error range is ± 1.5 m ³/h (i.e. the reading is between 98.5-101.5 m ³/h).

2. Accuracy calibration conditions

The manufacturer's nominal accuracy is usually measured under the following ideal conditions:

• Medium: Water (liquid) or air (gas), with a density consistent with the calibration medium.
• Temperature and pressure: normal temperature (20 ℃), atmospheric pressure (0.1 MPa).
• Installation: Vertical installation, upstream straight pipe section ≥ 5D, downstream ≥ 250mm.
• Flow state: stable laminar flow, without pulsation or vortex.