Flowmeter Selection is based on production requirements, from the instrumentation of the actual supply situation and consider a comprehensive measurement of security, accuracy and economy, and in accordance with the nature of the measured and fluid flow of traffic sampling devices determine the manner and measuring instruments The type and specifications.

the safe and reliable flow measurement, is the first reliable measurement methods, sampling devices in the operation will not happen in the mechanical strength or electrical circuit failure caused the accident and the other is measuring instruments in both normal production or failure Not under the influence of the production system's security. For example, the high temperature and high pressure power plants in the main steam flow measurement, the installation of a pipeline in the measurement components must firmly to ensure that the high-speed steam flow erosion under no body damage. Therefore, priority selection criteria are generally cutting expenditure devices, not optional dual-speaker of the cantilever or plug-flow meter, and other non-standard gun devices, and structural strength of low-target, such as turbine flow meter. Fuel power plants and a flammable gas of the occasion, should use anti-explosive-type instrument.

instrument in ensuring the safe operation on the basis of instruments to improve the accuracy and energy saving. To this end, we must not only meet the selection requirements of the accuracy of the instrument display, but according to the characteristics of the measured medium of choice reasonable measurement. Power plants in the main steam flow measurement, the power plant because of its security and economy is essential, are generally used with a mature standard of expenditure allocation Pressure Meter, the sewage and water treatment chemicals were the fuel flow and dirt Low Reynolds number viscous flow, do not apply the standard of cutting expenditure. The dirt-round choice of the general lack orifice, and other non-standard differential allocation of expenditure items or Doppler ultrasonic flowmeter, and the viscous flow volume can be used for target-or wedge-shaped flow meter, etc.. The water turbine, condenser water cycle and heat recovery units back to hot steam, and so are large diameter (400mm and above) the flow measurement parameters, because of processing difficulties and pressure to create large losses, the general selection criteria are not cutting expenditure devices. According to the measured media and special pieces of measurement accuracy requirements, a plug-flow meter, respectively, with differential pressure of gun components, ultrasonic flowmeter, or use of notation, simulation, and so incompetent loss measured way traffic.

life and to ensure the flow meter accuracy, Selection, we must pay attention to the anti-vibration instrumentation requirements. In hot and humid regions to choose hot and humid instrument.

the right to choose the instrument specifications, but also ensure accuracy of the instrument life and an important part. Special attention should be given the choice of static pressure and temperature. Hydrostatic pressure instrument that extent, it should be slightly larger than the measured media pressure of work, generally from 1.25 times to ensure that no leakage or accident. Range of choices, mainly limit the choice of instrument calibration. The election of the small and easy to overload, damage instrument; big election, hinder the accuracy of measurement. General as the actual operation of the largest flow of 1.2 a 1.3 times.

installed in the production pipeline's long-running contact instruments, measuring devices should also be considered flow caused by the energy loss. Under normal circumstances, in the same production pipeline should not be optional in many larger loss of pressure measurement devices, such as cutting expenditure, and other components.

In short, there is no measurement or the various fluid flow meter and can adapt to the flow. different measurement methods and structures for different measurement operation, the use of methods and conditions of use. Each Type species has its unique advantages and disadvantages. Therefore, should be measured in various ways and instruments of a comprehensive comparison on the basis of choice suitable for the production requirements, she not only reliable and economical, durable and best pattern.