Why Digital Water Flow Meter
Water flow meters are very important devices and often used in daily life and manufacturing. As its technology, water flow meters have mechanical type and electronic type. Digital water flow meters have no standard or official definition. But as usual understanding, it should at least have two features:
1).Digital display screen. This is different from traditional mechanical type water flow meters. Traditional flowmeters are usually dial indicating, which is not convenient to read.
2).No moving parts. In the past, mechanical water meters are sensing water flow by moving parts, e.g. paddle wheel, etc. This design brings many disadvantages, e.g. short life, poor stability in long term, narrow wide flow range, easily blocked by materials in water, etc. Later as electronic technology development, many electronic digital water flow meters are released. Comparing with mechanical type flow meters, they have many advantages: higher accuracy, no moving parts, no pressure loss, long-term stability, versatile signal output, wide flow velocity range, etc.
Electronic Water Flow Meter Type
From the two rules above, electronic water flow meters mainly have ultrasonic, electromagnetic, vortex, mass, etc. Except these types, there are other types for niche requirement.
Ultrasonic water flow meters have been one of the main selling items in the area and it has 3 kinds of structures: clamp on, insertion and inline, which can almost meet more the requirement of water flow measurement. Meanwhile, ultrasonic flow meters can support low power consumption, and this feature makes it more reliable to provide battery powered measurement without external DC/AC power supply. This is very useful for many applications where external power is not easy to get.
Magnetic flow meters are one of the main selling product for water flow test. It mainly has two structures: insertion and inline type. The inline type are main selling models which features high accuracy. The typical accuracy is 0.5 and max accuracy can reach 0.3-0.2. It can support battery powered measurement, but its power consumption is bigger than ultrasonic flow, especially when pipe size is bigger, its power consumption is much larger. Thus, when battery power supply, its max pipe size is often limited to DN300mm.
Vortex flow meters can be used for gas and liquid. So it can be used for liquid, water is no exceptional. But it is not often used for water. Comparing with ultrasonic and magnetic flow, its price is not lower and its technology is not so stable like them. So vortex flow meter is more often used for gas.
Mass flow meter has very high accuracy and it is a kind of very expensive flow device and water is not very expensive. So for most of applications, mass flow meter is not the first consideration for water flow measurement unless there is special requirement.
Misleading Advertisement of Electronic Flow Meter
We find many companies to make misleading advertisement to announce their flow meters are digital water flow meters, but in fact it is not. They just add a display unit to their mechanical water meters. This is not real electronic flow meter and their core flow sensing part still has moving parts. Thus, when you make purchasing, you should firstly delete it from your plan unless your project has hard rule. Such false electronic flow meter will improve its cost, but you won't get benefit from real advanced electronic water flow meter.