Is temperature and pressure compensation required for the volumetric flow rate of vortex flow meters?

You need it to measure the nominal flow rate, but not for the operating condition flow rate

Volumetric flow rate is meaningful only with temperature and pressure compensation

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Those that require temperature and pressure compensation.....

The vortex flow meter, without any corrections, outputs a signal that reflects the \"actual flow velocity\" directly (in the form of a shaped signal or pulses from the vortex sequence), and the corresponding unit of flow rate is m3/Hr. If a liquid is being measured, the DCS should use the M3/HR engineering unit, eliminating the need for temperature and pressure compensation. If the measured substance is a gas, the unit in the DCS configuration is NM3/HR, and temperature and pressure compensation are required. After temperature and pressure compensation, the mass flow rate is obtained, which is then converted to NM3/M3. The above conversion can be performed at the gauge header, but the pressure entered at the header is fixed, while the actual operating pressure varies, which leads to deviations in the operating density. Therefore, I am used to making compensations in the DCS: the gauge header sends out the actual flow rate signal (i.e., M3/HR), while the pressure and temperature are sent to the DCS. @jiaguoyun

If measuring the volumetric flow rate of a liquid medium, it is not necessary to perform temperature and pressure compensation, as the accuracy of vortex flow meters may not be sufficient to meet the requirements for such compensation, making it pointless to do so. However, in the case of quality measurement, since the density of liquids is significantly affected by temperature, it may be necessary to compensate for the density; indirectly, this means compensating for the temperature as well. However, for gas metering, whether it is volume or mass measurement, temperature and pressure compensation generally need to be taken into account.

A vortex flow meter measures the number of vortices generated as the fluid passes through the vortex generator; it has nothing to do with temperature or pressure

When using vortex flowmeters to measure gases, temperature and pressure compensation is generally required, as the volume of gases is greatly affected by pressure and temperature. When measuring liquids, temperature and pressure compensation is not necessary if the temperature is not high.

When measuring gases, try to apply temperature and pressure compensation

The flow rate under M3/H conditions is not required, while the flow rate under NM3/H standard conditions is required. In a sense, NM3/H can be regarded as mass flow rate!