Unit of rotor flowmeter | Is the measurement of gas by rotor flowmeter greatly affected by environmental pressure

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What is the approximate price of a rotor flowmeter?

2. Is the measurement of gas by the rotor flowmeter greatly affected by the ambient pressure?

When manufacturing and displaying the rotor flowmeter, there are two types of display: square grinding chamber potato type, one is the working condition and the other is the standard condition.. Operating condition: refers to the flow rate under working conditions, measured in m3/h; Standard condition: A flow rate of around 20 degrees Celsius at a standard atmospheric pressure. If the flow rate of the blind working state is different from the flow rate of the standard condition, the reading value of the flowmeter needs to be converted:

3. What does the GPM of the rotor flowmeter represent?

GPM: adding ridge bolun/minute, the unit of flow is disadvantageous. 1 GPM=0.27276 m ³/h=4.546 L/min=7.577x10 (-5) m ³/s, which is equivalent to 75.77 ml/s (imperial gallon).

4. Flow calculation formula of the metal rotor flowmeter.

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

1. Basic flow formula The basic formula of the metal rotor flowmeter is based on the float receiving Force balance, ignoring viscous force, the volumetric flow rate is: \ [Q=C {\ mathrm {R}} A_ {\ mathrm {R}} \ sqrt {\ frac {2V_ {\ mathrm {f}} - \ rho) g} {\ rho A_ {\ mathrm {f}} \] The meanings of each variable are: • \ (Q \): volumetric 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).