Saturated steam way of compensation

Abstract: the compensation mode information of saturated steam produced by excellent flow meter, flow meter manufacturer to offer you the quotation. ( 1) Look-up table method is used to calculate the density consistency of saturated steam temperature and pressure compensation, were essentially the same. The reason for this is that the saturated steam, a single value function relationship between the pressure and temperature, from the density of steam temperature detected with the temperature. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the compensation of saturated steam article details. ( 1) Look-up table method is used to calculate the density consistency of saturated steam temperature and pressure compensation, were essentially the same. The reason for this is that the saturated steam, a single value function relationship between the pressure and temperature, the density with the temperature of the steam temperature found out the corresponding pressure detected the density is the same. Therefore, the use of temperature compensation and pressure compensation is feasible on principle. ( 2) Differences in compensation accuracy by using temperature compensation and pressure compensation, respectively, can get much compensation accuracy, not only related to the accuracy of the temperature sensor and pressure transducer, and with the type of flowmeter, the operation condition of the measured object and ranges of pressure transmitter. Had a greater influence on the overall temperature measurement on the compensation accuracy, concrete analysis is as follows. (1) temperature measurement error on the results of the flow measurement. Temperature measurement error with flow measurement results, the relationship between impact is not big for superheated steam, such as the superheated steam temperature is 250 ℃, if the temperature measurement error is 1 ℃, in flow measurement result uncertainty caused by the temperature compensation is about 0. r (19% Vortex street flowmeter) 。 Influence of temperature signal is used in the saturated steam flow measurement in compensation, such as the pressure of 0. 7 mpa saturated steam and the equilibrium temperature is 170. 5 ℃, the corresponding density of 4. 132 kg/m3, if the temperature measurement error is - Table 1 ℃, and on the basis of saturated vapor density, the density of Chad is 4. The flow measurement error due to 038 kg/m3, which is about - 2. r (27% Vortex street flowmeter) 。 (2) the temperature sensor precision level. The accuracy of the temperature measurement error with temperature sensor level and the measured temperature values, such as the pressure of 0. 7 mpa of saturated steam, with A grade platinum thermal resistance temperature measurement, the error limits for & plusmn; 0. 49℃[ 4] Measurement results, if use the check table, steam density to compensate, uncertainty about the flow compensation & plusmn; 1. r (11% Vortex street flowmeter) 。 But if use B grade platinum thermal resistance temperature measurement, the error limit will increase to & plusmn; 1. 15 ℃, the flow to compensate the uncertainty is increased for & plusmn; 2. r (61% Vortex street flowmeter) 。 Obviously, B grade platinum thermal resistance for such use may cause error is considerable, so should not be commonly used. Here is only different precision grade of temperature measuring element is relative. Of course, this error is only a link for temperature measurement component, as for the flow measurement system uncertainty, also must be included in the second table flow, good flow sensor, the influence of the flow transmitter, etc. (3) pressure transmitter accuracy grades, pressure measuring error and its influence. Pressure measurement error related to the accuracy of the pressure transmitter level and range, for example, 0. Level 2, 0 ~ 1 mpa measurement precision pressure transducer measurement range is 0. 7 mpa saturated vapor pressure, the error limits for & plusmn; 2kPa。 If use the results to check the steam density table to compensate, then this error caused by the limited flow compensation uncertainty about & plusmn; 0. 25％R( Vortex street flowmeter) 。 Obviously, the pressure compensation can get the compensation accuracy is higher than the temperature compensation. （ 4) Concrete implementation difficulties described above two kinds of compensation methods are feasible, only from the principle of discussion, there will be other problems in the concrete implementation. 1) installation difficulties. Used to measure the saturated steam mass flow rate of differential pressure flowmeter, if choose temperature compensation, often due to temperature measuring casing from throttling pieces too close to flow state interference or simply cannot be installed to the ideal position and modify the plan. (2) entered into a state of overheating due to phase transition. For saturated steam, with high velocity flow through the steam flowmeter ( Vortex street flowmeter) When, due to the loss of pressure caused by adiabatic expansion tend to overheat steam into the state, then still see it as saturated steam, and checked according to the steam temperature of saturated steam density table, get the numerical is definitely too high. Because the above reasons, when measuring the mass flow of saturated steam, only measuring temperature, and density table, and then calculate the mass flow rate, applied in practice is not much. Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.

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