It is related to the type of flowmeter, the working conditions of the specific measurement object and the range selection of the pressure transmitter

Look-up table method to find consistency of density Saturated steam adopts temperature compensation and pressure compensation, which are essentially the same. The reason is that the steam in the saturated state has a single-value function relationship between its pressure and temperature, and the density detected from the temperature of the steam is consistent with the density detected by the pressure corresponding to this temperature. Therefore, both temperature compensation and pressure compensation are feasible in principle. The difference in investment is considered from the perspective of saving investment and reducing installation workload, because the price of a platinum thermal resistance is only a few tenth to a fraction of that of a pressure transmitter, so it is more economical to use temperature compensation. The difference in compensation accuracy How much compensation accuracy can be obtained by using temperature compensation and pressure compensation is not only related to the accuracy of the temperature sensor and pressure transmitter, but also related to the type of flowmeter, the working conditions of the specific measurement object and the pressure transmitter related to the range selection. Generally speaking, the temperature measurement has a great influence on the compensation accuracy, and the specific analysis is as follows. ① Influence of temperature measurement error on flow measurement results. The relationship between temperature measurement error and flow measurement result has little effect on superheated steam. For example, for superheated steam with a temperature of 250', if the temperature measurement error is IX:, the uncertainty of flow measurement result caused by temperature compensation is about It is 0.096^8 (differential pressure flowmeter) to 0.19^8 (vortex flowmeter). The most influential is that the temperature signal is used for compensation in the measurement of saturated steam flow, such as saturated steam with a pressure of 0.7^1^, Its equilibrium temperature is 170.500, and the corresponding density is 4, 132^^1!13. If the temperature measurement error is -1°C, and the saturated steam density table is checked accordingly, the density obtained is ^^^^]^/ !!!3, the flow measurement error is about -1.14^8 (differential pressure flowmeter) to -2, 27^11 (vortex flowmeter). ② Consideration of the accuracy level of the temperature sensor. The temperature measurement error is the same as the temperature The accuracy grade of the sensor is related to the measured temperature value, for example, the pressure is 0, 7^?3 saturated steam, the temperature is measured with an eight-stage platinum thermal resistance, and the error limit is ±!).^^^^', if you use Check the steam density table for this measurement result to make compensation, then the flow compensation uncertainty is about ±0.56^1? (differential pressure flowmeter) to ±1.11^2 (vortex flowmeter, and if 8-stage platinum thermal Resistance temperature measurement, the error limit is increased to ±1, 15 ..., then the flow compensation uncertainty is increased to ±1.31^8 (differential pressure flowmeter) to ±2,61^8 (vortex flowmeter> .Obviously, the error that may be caused by the 8-grade platinum thermal resistance used in such applications is considerable, so it is generally not suitable for use. Here we only make a relative comparison of temperature measuring elements with different accuracy levels. Of course, the errors mentioned here are only For the part of the temperature measuring element, as for the uncertainty of the flow measurement system, the influence of the flow secondary meter, flow sensor, flow transmitter, etc. must also be taken into account. ③Pressure transmitter accuracy level, pressure measurement error and Its impact. The pressure measurement error is related to the accuracy level and range of the pressure transmitter, for example, choose 0.2 level accuracy, 0〜11? 3 pressure transmitter measuring range measurement 0, 7^? 3 Saturated vapor pressure. The error limit is 21^? ^If this result is used to check the steam density table for compensation, the uncertainty of flow compensation caused by this error limit is about ±0.13^8 (differential pressure flowmeter) to ±0.25^8 (vortex flowmeter>). Obviously, pressure compensation can obtain higher compensation accuracy than temperature compensation.
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