Rotary flowmeter unit| Zunyi ultrasonic flowmeter manufacturer

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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. Calculation formula for flow rate of metal rotor flowmeter

The core flow calculation formula and correction method of metal rotor flowmeter are as follows:

1. Basic flow formula The basic formula of metal rotor flowmeter is based on the force balance of the float, and the volume flow rate when ignoring viscous for

ce is: \ [Q=C {\ mathrm {R}} A_ {\ mathrm {R}} \ sqrt {\ frac {2V_ {\ mathrm {f}}} (\ rho {\ mathrm {f}} - \ rho) g} {\ rho A_ {\ mathrm {f}}} \] The meanings of each variable: Q: Volume flow rate (unit: m ^ {3}/s); • \ (C {\ mathrm {R}} \): Flow coefficient (determined experimentally by float shape and Reynolds number, etc.); • \ (A_ {\ mathrm {R}} \): The annular gap area between the float and the cone tube (unit: \ (m ^ {2} \)); • \ (V_ {\ mathrm {f}} \): Float volume (unit: \ (m ^ {3} \)); • \ (\ rho_ {\ mathrm {f}} \): Float material density (unit: \ (kg/m ^ {3} \)); • \ (\ rho \): Fluid density (unit: \ (kg/m ^ {3} \)); • (g): Gravity acceleration (usually taken as 9.81m/s ^ {2} \); • \ (A_ {\ mathrm {f}} \): The maximum deficit cross-sectional area of the float (unit: \ (m ^ {2} \)).

2. The flow correction formula for practical applications needs to be corrected for differences between actual operating conditions and calibration states: 1 Gas flow correction formula: \ [\ frac {Q_ {1}} {Q_ {0}}=\ sqrt {\ frac {p_ {0}T_ {1}\rho_{0}}{p_ {1}T_ {0} \ rho_ {1}} \] • \ (p0 {0}, p0 {1} \): Absolute pressure of calibration and actual operating conditions; • (T_ {0}, T_ {1} \): thermodynamic temperature (in K) for calibration and actual operating conditions; • \ (\ rho_ {0}, \ rho_ {1} \): Gas density for calibration and actual operating conditions. two Liquid flow correction formula: \ [\ frac {Q_ {1}} {Q_ {0}}=\ sqrt {\ frac {\ rho_ {0} (\ rho_ {\ mathrm {f} - \ rho_ {1})} {\ rho_ {1} (\ rho_ {\ mathrm {f} - \ rho_ {0})} \] • \ (\ rho_ {0}, \ rho_ {1} \): Liquid density under calibration and actual operating conditions; • \ (\ rho_ {\ mathrm {f}} \): Float material density (fixed value).

Rotary flowmeter unit

2. Calculation formula for flow rate of metal rotor flowmeter

3. What does the G

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