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1. 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. 2. Is there a national standard for the calibration pressure of glass rotor flow meters?
The national standard for the calibration pressure of glass rotor flow meters is based on the mechanical industry standard JB/T 9255-2015.
. 1. Core content of the standard • Definition of calibration state: During calibration, the_600x400.jpg)
3. What is the relationship between the calibration pressure and range of a glass rotor flowmeter?
The calibration pressure of a glass rotor flowmeter is positively correlated with the range, and the higher the calibration pressure, the larger the flow range.
. 1. Core relationship • Pressure induced turbulence determines the density of the medium: Calibration pressure directly affects the density of the gas medium (according to the ideal gas state equation PV=nRT), and changes in density will cause changes in the force on the float, thereby affecting the flow measurement range. • Range correction formula: The actual range needs to be corrected according to the calibration pressure. The formula is: $$Q_ {Actual}=Q_ {Calibration} \ times \ sqrt {\ frac {P_ {Calibration}} {P_ {Actual}} $(Q is flow rate, P is absolute pressure) 2 Parameter Corresponding Example | Calibration Pressure (MPa) | Typical Range (Air, L/min） | |----------------|---------------------------| | 0.1| 0.5-5 | | 0.6| 2-25 | | 1.0| 5-50 | 3. Op