Flow meter rotor | There is a glass rotor flow meter with a unit of 20 ℃, 5kg/cm2, Nm3/hr. What does this mean ..

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1. The difference between the flow rate measured by the rotor flowmeter and the actual flow rate

The error remains the same and the influencing factors are different.

1、 The errors are different. The flow rate measured by a rotor flowmeter is based on the principle of throttling to measure fluid flow rate. The measured flow rate has an error of 0.2 to 0.6 cubic meters per hour under ideal conditions, while the actual flow rate is measured in the flow bridge under real conditions, with an error of basically 0. Therefore, the errors of the two are different.

2、 The influencing factors are different. The flow rate measured by a rotor flowmeter is changed based on the float in the test tube, and the annular gap area is proportional to the rising height of the float. Therefore, the flow rate measured by a rotor flowmeter is affected by the annular gap area, while the actual flow rate is the flow rate that the pipe section actually passes through. The flow rate size is related to the characteristics of the pipeline, so the influencing factors of the two are different.

2. There is a glass rotor flowmeter with a unit of 20 ℃, 5kg/cm2, Nm3/hr. What does this mean The label "20 ℃, 5kg/cm2, Nm3/hr" on the glass rotor flowmeter indicates the following information: Measurement medium: This flowmeter is used to measure the flow rate of gases. Standard conditions: "20 ℃" in the annotation indicates a temperature of 20 degrees Celsius during measurement, and "5kg/cm2" indicates a pressure of 5 kilograms per square centimeter during measurement. These two conditions together define the standard state during measurement. Flow unit: "Nm3/hr" represents the unit of flow in standard cubic meters per hour. The N here represents Normal , and the buried bucket is the standard state, which refers to the volume of gas at a specific temperature and pressure. In this case, the standard state refers to a temperature of 20 ℃ and a pressure of 1 atmosphere. However, in practical applications, sometimes the "standard state" is defined based on specific measurement conditions, where "Nm3" bending and grinding represents the volume under that specific condition. For accurate understanding, it is recommended to refer to the specific instructions of the flowmeter or consult the manufacturer. In summary, the glass rotor flowmeter is an instrument used to measure gas flow at a temperature of 20 ℃ and a pressure of 5kg/cm2, with the flow unit being standard cubic meters per hour.

3. How should I read a rotor flowmeter? Why?

The reading method for the rotor flowmeter is as follows: For the sub flowmeter reading method, stand in front of the flowmeter, with your eyes parallel to the float, and move your line of sight horizontally to the left until you see the outline of the float touching the positioning line. The corresponding reading value is at the intersection of the positioning line and the horizontal scale in the middle of the float.. A rotor flowmeter measures fluid flow based on the principle of throttling, but it changes the flow area of the fluid to maintain a constant differential pressure between the upper and lower parts of the rotor. Therefore, it is also known as a variable flow area constant differential pressure flowmeter or a float flowmeter. In a vertical conical tube that expands from bottom to top, the gravity of the circular cross-section float is supported by liquid dynamics, and the float can freely

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