![]() Hydraulic Systems Flow Meters are solely reliant on the correct amount of fluids being present in the actuator when the operation cycle begins. The MPV series of Flow Meters by SEIM offer tremendous advantages to applications to Hydraulic fluid applications including but not limited to heavy industry and other heavy-lift operations. However, if the answer is, ‘the PLC will think that the machine lubrication has failed and stopped working’, then you know how much you might budget to stop that from happening.SEIM Flow Meters for Hydraulic Applications This has two effects: Increasing the upstream pressure and generating heat.Ī better question might be, ‘What happens if you don’t measure flow?’ If the answer is ‘nothing it’s just one of many indicators we look at’, then you already know that you’re working with a very small budget. This ‘effect’ can be measured by the energy loss due to the presence of the meter, better known as the pressure drop (∆P) across the device. Typically, accuracies are quoted as a percentage of either side of the ‘maximum’ or ‘full-scale’ value or as a percentage of either side of the ‘measured’ or ‘indicated’ reading. This should be traceable and be based on when the flow meter was last calibrated and carried out under the conditions stated by the manufacturer. At other times, flow measurement is required to compare performance with other systems or against a manufacturer’s specification.Īccuracy is normally quoted by the flow meter manufacturer as a percentage value to indicate the acceptable error band. Why are you measuring flow how accurately do you need to measure flow?įor some applications, flow measurement is required to monitor trends, such as answering the question of whether ‘the flow is more or less than last week’. Lastly, you also need to know the system’s typical cleanliness level, especially if the system isn’t very clean, as some flow meters are more sensitive to contamination.ģ. Most importantly what are the maximum and minimum flows you need to measure, the maximum operating pressure and the ambient and system temperature range? The effect of the change in oil viscosity will affect some flow meter technologies more than others. Of particular interest are the fluid properties: Is it corrosive or a natural lubricant, and what is its material compatibility and viscosity characteristics?Īs the temperature of hydraulic oil increases, the kinematic viscosity goes down. ![]() It is important to know about the fluid(s) being measured, as the characteristics of the fluid can greatly influence the choice of flow meter. How important is it to measure flow what is your budget?įirst of all, is the flow meter going to be used on the same fluid all of the time? What effect might the flow meter have on the fluid and vice-versa?ĥ. Why is flow being measured how accurate does the flow measurement need to be?Ĥ. What are the hydraulic system operating conditions?ģ. When searching for a flow meter for use in a particular hydraulic application, these five questions can help:Ģ. What should you consider when selecting a flow meter? ![]() However, apart from being quite dangerous, the solution is not very practical once the oil is inside of the bucket, it is out of circulation, exposed to contamination and no longer inside of the hydraulic system. If you had no flow meter and needed to get an idea of the flow rate in a hydraulic system, a crude way to measure the flow would be to time how long it takes to fill a bucket with oil. Measuring one without the other can lead to an inaccurate diagnosis of why a system isn’t performing. gallons per minutes (UK gpm).įlow is to the hydraulic engineer what current is to the electrician, while pressure is the hydraulic equivalent of voltage. gallons per minute (US gpm), or, occasionally, U.K. For most hydraulic applications, flow is measured in liters per minute (lpm), U.S. ![]() By Martin Cuthbert, Managing Director, Webtec Ltdįlow is the measurement of the volume of a liquid that passes a fixed point in a unit of time. ![]()
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