The flow rate of liquids and gases is measured by the use of an instrument that is known as a flow meter. One should take into consideration the familiarity of the working personnel with the device and their experience with calibration when buying a flow meter. The maintenance factors such as availability of spare parts and the probability of failure are some factors one should put into consideration. The cost of installation one should also take into consideration. Because a device is less expensive one should not buy it since this can be the most costly installation. An installation engineer one can consult when buying the flow meters just in case there are any flow measurement challenges. The best flow meters basics of selecting are evaluating the nature of the process fluid and the fluid and flow characteristics. Also, one should consider the piping and the area the ultrasonic flow meter is to be located.
The characteristics of the fluid to be considered are the pressure, temperature, viscosity, density and many others. For the flow meter to operate properly these properties should have an indication of how they should interact. A detailed composition of the fluid should also be there. That one should indicate whether the fluid has solids and whether they are soft or abrasive or whether they have small or big particles this is to say. One should know the required meter range so that they can select the best meter and this is done by identifying the minimum and maximum flows that will have to be measured. The flow meter’s performance may not be accepted over its full range unless one knows the measurement accuracy. When one is purchasing a flow meter they should choose the ones without moving parts over the ones with them. Since the moving parts are prone to wear and tear, usually the flow meters with moving parts are a cause of problems and failure. Clearance spaces for the moving parts that sometimes cause slippage into the flow being measured they also require.
Included in the different types of flow meters which are there are; rotameters, piston flow meters, paddlewheel, turbine flow meters, ultrasonic flow meters and magnetic flow meters. Available for in-line and insertion type the magnetic flow meters are. Ideal they are for any waste liquids that are conductive. Usually integral the displays are and an analog output can be used or remote monitoring. For dirty water or waste water the ultrasonic flow meters are also used. Employed by the principle of operation is the frequency shift of an ultrasonic signal when it is reflected by discontinuities in the liquid flow. The rotameter on the other hand is the most used for liquids and gases.