Turbine meter accuracy
Generally speaking, selects the turbine flowmeter is mainly focuses on its high accuracy. The accuracy of the turbine flowmeter for liquid roughly at present: the international market for plus or minus 0.15% R, plus or minus 0.2% R, and plus or minus 1% plus or minus 0.5% R R, finalize the design product is a plus or minus 0.5% domestic R and R + / - 1%; Gas: the international market and plus or minus 1% plus or minus 0.5% R R, domestic and plus or minus 1.5% plus or minus 1% R R, accuracy refers to the range of degrees of 6:1 or above 10:1. Accuracy in addition to the related to itself, the quality of the products, also is closely related to the conditions of use. If narrow degree of accuracy can be improved; Especially as a standard table method standard flowmeter flow standard device, if the designated use, accuracy can be greatly improved.
1, the higher the turbine meter accuracy, is more sensitive to the change of site conditions of use, to maintain its high accuracy, need for instrument coefficient of special processing. A process is called the instrument coefficient of floating treatment method. By on-site real-time processing the following conditions:
A) viscosity is affected by temperature;
B) density is affected by pressure, temperature,
Redundant sensor signal (c) a two sensor output signal, monitoring the ratio;
D) coefficient of long term stability (take control chart to determine), etc.
Storage and transportation transition measurement for trade, often equipped with on-line calibration device, in order to check on a regular basis. Factory precision instrument listed in the instruction for use as the basic error, the scene should estimate the additional error, the error should be a synthesis of both. The selection of the turbine flowmeter of the flow range has large influence on the accuracy and service life.
2, be careful to the requirement of precision instrument level, should consider from economic Angle, such as large diameter oil (gas) pipeline trade settlement instrument, major economic relations, investment is more economical in the instrument. As for throughput or not as process control with only moderate accuracy level can, avoid by all means is blind pursuit of high precision. This safety type explosion-proof sensor adapter safety barrier types and factory inspections explosion-proof rating and approval number, etc. If you want to display mass flow volume flow (or standard conditions) to matching pressure, the density of the temperature sensor or instrument. Turbine meter display now by microprocessor based computer can communicate with computer to flowmeter included, function and application scope of the instrument in the instrument are far more than the old turbine flow display. CD printing copy CD now as a trade measure each type flowmeter are tend to be equipped with a direct-reading display device. Not only has a total measurement showed that can also additional compensator (a fully functional flow computer) output signal remote transmission.