Glass tube flowmeter

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1. Verification Method for Gas Glass Tube Float Flow Meter

There are three main methods for verifying gas glass tube float flow disturbance wheel flow meters, which need to follow the "JJG 257-2007 Float Flow Meter Wu Ying Verification Regulations". 1. Volume method bell jar gas flow standard device: can choose exhaust method or intake method. The exhaust method involves the discharge of gas from a gas device into a flow meter, while the intake method involves the flow of gas from a gas source through a flow meter into the gas device. Measure the gas volume hysteresis and synchronization time of the gas discharge (inflow) device, as well as the gas pressure and temperature inside the gas device and at the flow meter, and calculate the actual flow rate of the flow meter in the standard (scale) state according to the corresponding formula. Soap film gas flow standard device: The gas flowing out from a stable gas source is adjusted to a certain flow rate by a float flowmeter through a flow control valve. It enters the soap film tube through the inlet at the lower end of the soap film tube, squeezes the rubber ball (or uses other methods) to produce soap film. Due to the pressure of the inlet, the soap film is pushed up along the soap film tube at a constant speed. When the soap film reaches the lower mark of the soap film tube, the timer starts counting. When the soap film reaches the upper mark of the soap film tube, the timer stops counting. The instantaneous flow rate through the float flowmeter can be calculated based on the measured time and the volume between the two marks of the soap film tube. Electronic soap film flowmeter: The gas flowing out from a stable gas source is adjusted to a certain flow rate t

hrough a flow control valve, and after stabilization, the flow rate of the intelligent electronic soap film flowmeter is read. 2. Installation requirements: Before calibration, the vast majority of the float flowmeter must be installed vertically on a vibration free pipeline, without obvious inclination, and the fluid must flow through the instrument from bottom to top. The angle between the centerline of the float flowmeter and the plumb line is generally not more than 5 degrees. For high-precision (grade 1.5 or above) instruments, the angle requirement is more stringent and should be ≤ 2 degrees.

2. What equipment is used for the calibration of glass tube float flow meters?

The calibration of glass tube float flow meters mainly uses the following three standard devices.

1. The standard meter method device uses a high-precision standard flow meter as a reference benchmark and connects it in series with the tested glass tube float flow meter in the same pipeline.

. By comparing the measured values of the two under the same operating conditions, the error of the tested flow meter can be calculated. This method is applicable to a wide range of flow rates and has a relatively simple device construction. The core of the weighing device includes a weighing container, a high-precision vertical weighing sensor, and a timer. The working principle is to measure the mass of fluid flowing into the weighing container over an accurate period of time, and then convert the volumetric flow rate based on the density of the fluid at that time, which is used as the true value to calibrate the flowmeter. This is the most accurate of the three methods and is often used as an arbitration verification method.

3. T

1. Verification Method for Gas Glass Tube Float Flow Meter

2. What equipment is used for the calibration of glass tube float flow meters?

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