Flow meter for chemical feeder forms a very critical and an important aspect in chemical processing. Effectiveness of these operations and machines depend on how accurate the data is on the flow measurement. The flow meter seems to give the manufacturers also an idea as to how much are the resources getting used. Hence many of them are considering in purchasing them. It helps in saving and conserving important natural resources, which may have been going waste as they are not accounted for. Hence it is important that we consider important points before we pick the right device.
There are some advantages and disadvantages of very frequently used measurement technologies. Coriolis meter is a vibrating tube where a fluid or liquid tends to cause change in the frequency, amplitude or phase shift. Coriolis can directly measure the mass of fluid or liquid with great accuracy over many temperatures. They can also measure dense gases. Since the design is open it helps in measuring even non conducive and viscous fluids which may be difficult to measure by other devices. It requires very less attention and care as compared to other devices as there are no internal parts that are moving. Hence they are sometimes considered to be very expensive, sophisticated or unmanageable. You can check for good quality chemical flow meter here; https://www.silverinstruments.com/.They specialise in flow meters. They provide a number of options on their website from which you can choose and decide which flow meter will be best suited for your machines or equipments.
Another aspect you must consider while going for a flow meter is the differential pressure. There are some meters that measure differential pressure and get the square root. Differential pressure meters are very versatile and handy instruments that measure accurately without needing any moving parts. However they are considered to be complex devices to install and sometimes, do not give accurate measurements. However, any viscosity changes do not affect these devices to a great extent.
Then there are electromagnetic chemical mass flow meter that employs law of electromagnetic induction. Here when the conductor is moving through a magnetic filed, a voltage is produced and a measurement is calculated. The liquid or fluid actually acts as a conductor. There are coils that are energised outside the tube which also create the magnetic field. The voltage that is produced is directly proportional to flow rate. The good part about an electromagnetic meter is that it will measure any slurry or conducive liquid, including waste water as well as processed water. These devices provide good repeatability, low pressure, large turn down ratio and high accuracy. Electromagnetic flow meters can be really expensive and heavy on the pocket when you go to buy one of them. Not only are they expensive but also quite heavy.
Thermal mass flow meters have a heated sensing power which is different from the liquid flow path. Basically, the flow conducts the heat away and this rate is directly proportional with the rate of the mass flow. It is a linear output system, which gives a directly proportional mass flow rate of the fluid or liquid. They are considered to be cheap chemical flow meter that come at a low price point as compared to the electromagnetic flow meters. They can work with any kind gases including low pressure gases. However one of the major disadvantages of this meter is that it has only low to at the most medium accuracy while measuring. But, now suppliers have also improved the capabilities of this flow meter in recent years.