Aoke AK-LUGB temperature and pressure compensation integrated steam flowmeter: LCD integrated display instantaneous cumulative flow, temperature value, pressure value, measurement accuracy 1.5, 4-20mA signal output, stainless steel, measuring temperature 350 degrees, flange installation, manufacturers Sales!
Steam flow measurement is a large-scale measurement task for enterprises. Temperature and pressure compensation in steam flow measurement is also an old topic. However, the deeper the discussion, the more inspiring people to develop instruments with low price, high precision and strong functions. Good instrumentation with good instrumentation.
The purpose of temperature and pressure compensation in steam flow measurement is to correct the effect of the density of steam on the measurement results when the operating conditions of the steam deviate from the design conditions. Because the steam is in a gas state, its density changes greatly when its temperature and pressure change. If it is not compensated, the error caused is very large. For example, when designing a saturated water vapor with a pressure of 1 MPa (gauge pressure), when the pressure drops to 0.8 MPa, the density drops to 82% of the design value. If the temperature and pressure compensation is not performed, the influence on the differential pressure flowmeter is the indication value. The increase was 10.4%, and the effect on the vortex flowmeter was to increase the indication by 21.9%. Obviously, the flow measurement object for temperature and pressure changes must be compensated for temperature and pressure in addition to the direct mass flow meter.
Reduce the error method:
When the steam flow meter is installed in the pressure reducing valve before the steam is not decompressed, there is no phase change problem. Therefore, before the pressure gauge is installed in the pressure reducing valve, it can be processed according to the saturated steam compensation method to ensure the measurement accuracy.
If the flowmeter can only be installed behind the pressure reducing valve, a pressure transmitter can be added for temperature and pressure compensation.
If the pressure regulating function of the pressure reducing valve is better, the pressure value upstream of the flow meter can be set as a constant value (operated by the panel) to the secondary meter for temperature and pressure compensation.
1. For the compensation of working conditions of saturated steam, pressure compensation or temperature compensation can be used. However, the former has higher compensation accuracy, while the latter has some investment savings.
2. After the superheated steam becomes supersaturated steam, it has no major influence on the vortex flowmeter, but it has a great influence on the orifice flowmeter.
3. After the supersaturated steam becomes superheated steam, if the pressure compensation is used, the introduced error is small; if the temperature compensation is used, the introduced error is very large. But reasonably choose the position of the meter measurement point. This error can be eliminated or reduced to a small extent by using a suitable compensation method. 
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