How does a Yokogawa vortex flow meter for measuring nitrogen, with units of Nm3/h, function?
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Dear teachers, there is a vortex flow meter on site used to measure nitrogen flow; the pressure of the nitrogen varies between 0.5 and 0.7 Mpa. The brand of this meter is Yokogawa Electric, and the unit displayed on its gauge is Nm3/h. No signals are connected to this meter, so how does it convert the nitrogen flow rate into standard cubic meters?
The flowmeter body is equipped with temperature and pressure sensing elements for compensation. Standard-condition measurement is achieved through a fixed built-in calculation module.
When you purchase this instrument, the data sheet provided by the manufacturer includes the process parameters; the manufacturer sets it according to those parameters, which allows the standard volume to be determined.
When ordering a vortex flowmeter, the user needs to provide information on the process conditions and properties of the medium. The flowmeter manufacturer uses specialized software to carry out calculations, determining the appropriate size of the flowmeter for measuring the flow rate of that medium under the user’s process conditions. It is also possible to specify whether the flowmeter’s output should be in standard conditions, under the actual operating conditions, or in some other appropriate condition. This was determined at the time of delivery after the flow meter was manufactured. There used to be a flow meter calculation software from Yokogawa Electric on the forum; I’m not sure if it’s still there
You only took a photo of the nameplate, not the front side. Let me explain two possibilities:
You only took pictures of the nameplate, not the front side. Let me explain two possible scenarios: ① The flow meter has built-in temperature and pressure compensation, which automatically calculates the standard cubic flow rate by adjusting the compensation method； ②The flow meter does not have temperature and pressure compensation, but the operating pressure and temperature values were provided before placing the order; internal simulation of compensation is carried out using these input parameters to determine the standard cubic flow rate
Without pressure measurement, the flow meter can be set with a design pressure, and it outputs the flow rate under standard conditions calculated at that design pressure.
When placing an order, you will be asked to provide a data sheet or process parameters. It seems that this vortex flow meter does not have temperature and pressure compensation; therefore, there is only one possibility: the manufacturer calculates the density based on the temperature and pressure values you provide, and this value is programmed into the circuit board. The program inside the circuit board will then automatically convert cubic units to standard cubic units for display. Of course, you can also switch to cubic units, or even to tons or kilograms
This type without temperature and pressure compensation is calculated through internal parameter settings. Some parameters can be modified on-site.