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Orifice flowmeter in situ measurement, often due to some objective factors, resulting in large error measurement results, the following is to introduce the main measures to ensure the orifice flowmeter measurement accuracy:
- the orifice-plate flowmeter is calibrated on a per-stage basis. As we all know, standard orifice as long as the design and manufacture of reference to relevant standards, do not need real stream can be directly used. Because the outflow coefficient can be directly calculated by the software, but computer computing after all the more ideal, and the scene environment still has a certain difference, so, in order to ensure the measurement accuracy, it is recommended that each flowmeter for the real stream, the calibrated outflow coefficient and calculation results are compared, calculated travel value, to amend.
- the Reynolds number is corrected, the flow coefficient of orifice flowmeter and Reynolds number have a definite relation, when mass flow rate changes, the Reynolds number is proportional to change, thus causing the change of flow coefficient.
- the effect of temperature on orifice flowmeter and its correction, fluid temperature changes caused by the change in density, resulting in differential pressure and flow of the relationship between the changes, and secondly, the temperature changes caused the pipe inside diameter, hole plate openings, changes in temperature changes, is to take the temperature meter measurement field temperature and then input to two meters to correct the temperature changes caused by the error.
- expandable correction. When the orifice flowmeter measures the steam and gas flow, it must be adjusted for the expansion of the fluid, and the specific correction coefficient can refer to the design Manual of the throttle device.
- Steam mass flow calculation, orifice flowmeter measurement of steam, first by differential pressure signal to obtain flow value, and then by steam temperature, pressure value look-up table to obtain density, to calculate the steam flow quality.
In fact, orifice flowmeter for the flow of our application is very extensive, but also the differential pressure type flowmeter representatives, we can through appropriate inference to promote other differential pressure flow meter.
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