An instrument that is used to measure the flow rate of liquids and gases is a flow meter. When buying a flow meter one should take into consideration the familiarity of the working personnel with the device and their experience with calibration. The maintenance factors such as availability of spare parts and the probability of failure are some factors one should put into consideration. Also one should take into consideration the cost of installation of the flow meter. A device because it is less expensive one should not buy since this can be the most costly installations. An installation engineer one can consult when buying the flow meters just in case there are any flow measurement challenges. The basics to selecting the best flow meters are evaluating the nature of the process fluid and the fluid and flow characteristics. Also, one should consider the piping and the area the flow meter is to be located.
The characteristics of the fluid to be considered are the pressure, temperature, viscosity, density and many others. Of how they should interact these properties should have an indication for the flow meter to operate properly. Also there should be a detailed composition of the fluid. Whether the fluid has solids and whether they are soft or abrasive or whether they have big or small particles this is to say that one should indicate. One should know the required meter range and this is done by identifying the minimum and maximum flows that will have to be measured so that one can select the best meter. Over its full range the flow meter’s performance may not be accepted 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. Usually the flow meters with moving parts are a cause of problems and failure since the moving parts are prone to wear and tear. They also require clearance spaces for the moving parts that sometimes cause slippage into the flow being measured.
Different types of flow meters are there and they include; rotameters, piston flow meters, paddlewheel, turbine flow meters, ultrasonic flow meters and magnetic flow meters. The magnetic flow meters are available for in-line or insertion type. They are ideal for any waste liquids that are conductive. Usually integral the displays are and an analog output can be used or remote monitoring. Also the ultrasonic flow meters are used for dirty water or waste water. Employed by the principle of operation is the frequency shift of an ultrasonic signal when it is reflected by discontinuities in the liquid flow. On the other hand the rotameter is the most used for liquids and gases.Getting Down To Basics with Resources