Why do flowmeters need temperature and pressure compensation

2021-09-10
 Why do flowmeters need temperature and pressure compensation

1. When the flowmeter measures the gas, it needs to be compensated at the same time for temperature and pressure; the gas is generally settled at the standard volume flow rate. Because the volumetric flow rate of gas changes when temperature or pressure changes, the flow rate will change.

2. When measuring superheated steam, temperature and pressure compensation are required at the same time; steam is generally settled by mass flow. Because any one of temperature or pressure changes, the density of the steam will change, and the mass flow will also change.

3. When the flowmeter measures saturated steam, single temperature compensation or single pressure compensation is required. The density of saturated steam has a fixed correspondence with temperature or pressure (saturated steam density table). Knowing any of them can determine the density of saturated steam.

4. When measuring liquids, pressure compensation is generally not required. Below 5MPa, generally only the influence of temperature is considered, and temperature compensation is required for accurate measurement. In general measurement, no compensation is required; measurement of some hydrocarbons (such as crude oil) generally requires temperature and pressure compensation at the same time.


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