Flow meter issues
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At present, I need to install a flow meter for the nitrogen in my system; I have chosen the Rosemount Critical Process 8800 vortex flow meter. Does this flow meter require temperature and pressure compensation, or is it integrated? The operating temperature is room temperature, and the pressure is around 0.8 MPa
If the temperature and pressure do not change much, no temperature and pressure compensation is required.
For the measurement of compressed gases, models with temperature and pressure compensation are used to ensure accurate measurement. Moreover, for measuring compressed gases in your company, it is advisable to use flowmeters of the same type to ensure consistency in units; if temperature and pressure compensation is required, standard cubic units should be used.
Thank you. Do you have any information on the Rosemount Critical Process 8800 flow meter? Is it a model that combines temperature and pressure compensation functions? I’ve been searching for a long time but haven’t found any information on this topic
The pressure and temperature changes are not significant, so it is generally not necessary
Thermal and pressure compensation is used to enable the meter to calculate mass flow rate and cumulative mass flow more accurately. . It can be present, it can be absent, or an integrator can also be integrated.
It entirely depends on the process requirements: if you need volumetric flow rate and no compensation is required, then fixed temperature and pressure compensation suffices; if accuracy is important, additional sensors for compensation are needed, and for the most stringent requirements, a mass flow meter is necessary. That’s just my humble opinion
Vortex flowmeters are used to measure volumetric flow rate, and the manufacturer will set a compensation factor for the instrument based on the provided temperature and pressure. If the measurement requirements are not high, and the design pressure and temperature differ little from the actual values, the error will not be significant. If the actual conditions deviate significantly from the design values, especially regarding pressure, the error remains quite large. However, vortex street mass flow meters are much cheaper, and you can inquire with the manufacturer at the time of purchase whether they can help adjust the compensation coefficient once the device is in use.