Those who are involved in the instrumentation industry know that there is a simple rule; the more money you invest the more accuracy you will get. Paddle wheel Flow meter and Plastic Flow Meter however is very close to dispelling this rule. Modern technology today with its advanced plastics and metals as well as their solid-state circuitry accompanied with good old capitalism has challenged the high cost of accuracy.Utilizing the computer-enabled testing facilities, paddle sensors are individually tested and are accurate to the extent of being within 1% of the full scale range reading. Thereafter, the sensor’s flow parameters are printed with the reading and packed with that particular Flow meter. It is important to note that although the paddle sensor is minutely tested, and the accuracy is confirmed, still installation variables can have an affect on the meter’s ultimate performance. However, the paddle wheel Flow meter really gives you more accuracy for your dollar. The Truflo Paddle wheel Flow meters sensor is many a times referred to as a kind of turbine flow sensor. Both the sensors that are the Paddle wheel flow meter and the plastic flow meter is equipped with a rotor along with a Bearing accompanied with a shaft, but there is a big difference between the two that gives paddle wheels the advantage. It must be mentioned here that the plastic wheel flow meter’s sensor's shaft is in the direction of the flow, whereas, a paddle wheel sensor's shaft is perpendicular to the direction of the flow. If we compare the plastic flow meter’s sensor's shaft and the shaft of a paddlewheel flow meter, we find that paddle wheel flow meter’s sensor sustains less axial thrust resulting in less friction. A turbine sensor being equipped with more blades to receive the flow momentum needs a bigger impulse to move the rotor and overcome the higher friction. Comparatively speaking, Paddle wheel Flow meters have distinct advantages over Roto meter style Plastic Flow meters. Paddle wheel style Flow meters can be installed both horizontally and vertically, with flow in either direction, without affecting the overall meter performance. Paddle wheel Flow meters come with a complete sensor, digital display along with in-line meter body (pipe fitting) that can be easily installed into a piping system. Paddle wheel Flow meters such as Truflo operate on advanced solid-state circuitry. This can run on common batteries thereby eliminating the requirement of electrical connections. Due to the advanced technology, batteries last for a minimum of one year.The factory settings even when the batteries are replaced. Truflo Paddle wheel Flow meters have the capabilities such as batch process control along with analog output signals and remote readouts. The addition of air pockets to the rotor reduces the friction force between the rotor and the shaft. The weight of the magnet, the plastic selected for the rotor and the air pocket is responsible for the density of the paddle wheel. The paddle wheel meters also work remarkably well with not only water but also it works well in the case of viscous fluids. But a fully developed turbulent flow profile is essential for this. In order to maintain accuracy, the 4000 Reynolds number must be above throughout the entire flow range. The Paddle wheel meters are not affected by changes in the fluid’s specific gravity. Therefore, special calibrations are not required. The Truflo Paddle Wheel Flow Meters and the Plastic Flow Meters are therefore the most popular flow meters due to their efficiency, cost friendly and long life.
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