1. When the flowmeter measures gas, it needs temperature and pressure to compensate at the same time; the gas is generally settled in standard condition volume flow. Because the gas volume flow rate or pressure changes, the flow rate will change.
2. When measuring superheated steam, it needs temperature and pressure to compensate at the same time; steam is generally settled by mass flow. Because either temperature or pressure changes, the density of the steam changes and the mass flow rate changes.
3. When the flowmeter measures saturated steam, single temperature compensation or single pressure compensation is required. The density of saturated steam has a fixed relationship with temperature or pressure (saturated steam density table). Knowing any of these, the density of saturated steam can be determined.
4, when measuring liquids, generally do not need pressure compensation, below 5MPa, generally only consider the temperature effect, in order to accurately measure the need for temperature compensation. In general measurements, no compensation can be used; measuring some hydrocarbons (such as crude oil) generally requires simultaneous temperature and pressure compensation. Http://
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