Ethane flowmeter

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1. Does the sensor of the split explosion-proof electromagnetic flowmeter also need to be explosion-proof? The main reason is that there are many flammable and explosive gases. Common flammable and explosive gases include hydrocarbons such as hydrogen, carbon monoxide, methane, propane, ethylene, ethane, acetylene, as well as hydrogen sulfide. Therefore, it is required that the gas sensor has explosion-proof function. Original principle: Semiconductor gas sensor (1) SnO2 semiconductor is a typical surface type gas sensing element, and its sensing principle is that SnO2 is an n-type semiconductor material. When a voltage is applied, the temperature of the semiconductor material increases, and the adsorbed oxygen accepts electrons in the semiconductor to form O2 or O2 primary gas H

2. When CO and CH4 are present, the surface resistance of the semiconductor decreases, the conductivity increases, and the conductivity change is proportional to the gas concentration. NiO is a p-type semiconductor, and its conductivity decreases due to oxidizing gases, making it sensitive to O2. ZnO semiconductor sensors also belong to this type. Semiconductor gas sensors a. Conductivity type sensor elements are divided into surface sensitive and volume controlled types. Surface sensitive sensing materials include SnO2+Pd, ZnO+Pt, AgO, V205, and metal phthalocyanine Pt —SnO2。 Surface sensitive gas sensors can detect various flammable gases such as C0, NO, and Freon. The gas sensor made of sensing material Pt-SnO2 can detect combustible gases such as CO, H

2, and CH4.

2. Does anyone know the gas flow calculation table?

Note 1: The flow range listed in Table 2 is calibrated under the following conditions: for gas, i

(1) According to the lower limit flow rate Qmin given in Table 2, the reference medium density ρ 0 (gas ρ 0=1.293kg/m3; Liquid ρ 0=1000kg/m3; Calculate the lower limit flow rate Qmin ρ for different medium densities using the following formula: steam ρ 0=2.1628kg/m3 and medium density ρ; Qmin ρ=Qmin ρ 0/ρ (m3/h)

(2) The viscosity lower limit flow rate Qmin ν Qmin ν=6 ν D × 104 (m3/h) can be calculated based on the kinematic viscosity of the medium used. In the formula: D - inner diameter of the pipeline (mm) ν - kinematic viscosity (m2/s). Compare Qmin ρ and Qmin ν, and take the larger value as the lower limit flow rate of this type of flowmeter when used in this medium. Explanation: B. The upper limit flow rates for various media are shown in Table 2. In general, the upper limit flow rate of liquid is 6m/s; The upper limit flow rate of gas or steam is 45m/s. Note 2: The resistance coefficient Cd of the intelligent vortex flowmeter is 2.2. The resistance loss of the flowmeter at different flow rates can be calculated according to the following formula: △ P - resistance loss (Pa) ρ - medium density (kg/m3) V - average flow velocity inside the tube (m/s). Note 3: When using a liquid medium, in order to prevent gasification an

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