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1. Which type of flow meter is more suitable for measuring biogas? The most suitable flow meters for measuring biogas include vortex flow meters, electromagnetic flow meters, and thermal gas mass flow meters. The appropriate products can be selected according to the actual working conditions. 1. The vortex flowmeter works based on the Karman vortex principle, and calculates the flow rate by detecting the regular vortex frequency generated by the vortex generator. Advantages: Simple structure, easy installation, high precision measurement accuracy, wide range ratio, and can adapt to a certain temperature and pressure fluctuation range. Applicable scenarios: Suitable for situations where the composition of biogas is relatively clean and there are basic requirements for measurement accuracy
2. The electromagnetic flowmeter determines the flow rate by measuring the induced electromotive force generated by the cutting magnetic field of a conductive fluid based on Faradays law of electromagnetic induction. Advantages: High measurement accuracy, not affected by the density, viscosity, and temperature of biogas, and low pipeline pressure loss. Applicable scenarios: Suitable for scenarios where biogas contains certain moisture or impurities and requires high measurement accuracy for infiltration. 3. Thermal gas mass flow meters use the principle of thermal conduction to directly calculate mass flow rate by measuring the heat carried away by the gas flowing through the sensor. Advantages: It can directly output mass flow data without additional temperature and pressure compensation, has a large range ratio, and can also measure low flow rate biogas. Applicable scenarios: Suitable for situations where high measurement acc
2. What are the emergency handling methods for the display of over range in vortex flowmeters?
The core principle for emergency handling of over range display in vortex flowmeters is to quickly restore the normal operation of the process first, and then investigate the cause of the over range, which can be promoted in two directions: temporary emergency and long-term investigation.
Temporary emergency handling steps 1 First time load reduction or medium cut-off: If the fluid flow rate instantly exceeds the upper limit of the range, immediately reduce the fluid flow rate and flow rate in the process pipeline, or close the upstream and downstream valves to cut off the medium, to avoid continuous over range operation of the flowmeter and damage to the internal sensor. 2. Temporary bypass switching: If the production cannot be completely stopped, it can be switched to the backup flowmeter for measurement to ensure the normal operation of the production process. 3. Reset the instrument: Disconnect the power supply of the vortex flowmeter, wait for 10-30 seconds, and then power it back on. The temporary over range error of some instruments can be cleared by resetting. 2. Investigation and radical measures for over range reasons The actual flow rate does indeed exceed the range: check the flowmeter selection parameters to confirm whether the current actual flow rate exceeds the maximum range value of the instrument. If it exceeds the range for a long time, it is necessary to replace the vortex flowmeter with a larger range. 2. Instrument parameter setting error: Check whether the upper limit setting value of the flowmeter has been mis
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