The hydraulic flow meter is mainly for inline hydraulic system instantaneous flow test and high-pressure test. Industrial Hydraulic oil flow meter, also called hydraulic flow gauge.
Sino-Inst offers Turbine, Mass flow, Oval gear, V-cone, Target, and Orifice flow meters for inline hydraulic oil flow. Features like: bidirectional, high pressure, analog, can be customized as customer need.
Sino-Inst offers a variety of hydraulic oil flow Meters for flow measurement. If you have any questions, please contact our sales engineers.
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- What is a hydraulic flow meter?
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How to use a hydraulic flow meter
- A flow meter can be placed in any location of the hydraulic line to detect the flow rate. Flow meters with variable port sizes are available that are suitable for different hydraulic systems.
- When the hydraulic system operates, the fluid is passed towards the flow meter.
- A flow meter mainly contains 3 parts; the primary device, a transducer and a transmitter. The transducer senses the hydraulic fluid passing through the primary device.
- And a usable flow signal is generated by the transmitter when the sensed signal is sent by the transducer.
- The volume is calculated based on the principle that the volume of fluid passing is directly proportional to the cross-sectional area and the fluid velocity.
- Also, the mass flow is directly proportional to fluid density and volume.
- Then, this calculated hydraulic measurement is displayed on the hydraulic flow meter gauge.
- All standard hydraulic oil flow meters supports unidirectional flow.
- But, reverse flow by-pass options are also available with some selected flow meters.
- Selecting a hydraulic flow meter is a difficult procedure. A wrong selection will cause errors in the diagnosed result.
- The factors that need to be considered while selecting a hydraulic flow meter are:
- the hydraulic fluid properties.
- operating condition of the hydraulic system.
- the need for measuring flow.
- the level of accuracy required.
- the effect of fluid on flow meter and vice-versa.
- and finally the budget.
More about inline oil flow meter
Flowmeters are devices that measure the rate of liquid, gas or vapor that passes through them.
Some flowmeters measure flow as the amount of fluid passing through the flowmeter during a time period (such as 100 liters per minute).
Other flowmeters measure the totalized amount of fluid that has passed through the flowmeter (such as 100 liters).
Flow measurement can be described by :
Q = A x v
Q is flow rate, A is the crosssectional area of the pipe, and v is the average fluid velocity in the pipe.
Putting this equation into action, the flow of a fluid traveling at an average velocity of a 1 meter per second,
through a pipe with a 1 square meter cross-sectional area is 1 cubic meter per second.
Note that Q is a volume per unit time, so Q is commonly denoted as the “volumetric” flow rate.
Now consider the following equation:
W = rho x Q
Where W is flow rate (again – read on), and rho is the fluid density.
Putting this equation into action, the flow rate will be 1 kilogram per second,
when 1 cubic meter per second of a fluid with a density of 1 kilogram per cubic meter is flowing.
(The same can be done for the commonly-used “pounds”. Without getting into details — a pound is assumed to be a mass unit.)
Note that W is a mass per unit time, so W is commonly denoted as the “mass” flow rate.
Now — which flow do you want to measure? Not sure? In some applications, measuring the volumetric flow is the thing to do.
Consider filling a tank.
Volumetric flow may be of interest to avoid overflowing a tank,
where liquids of differing densities can be added.
(Then again, a level transmitter and high level switch/shutoff may obviate the need for a flowmeter.)
Consider controlling fluid flow into a process that can only accept a limited volume per unit time.
Volumetric flow measurement would seem applicable.
In other processes, mass flow is important.
Consider chemical reactions,where it is desirable to react substances A, B and C.
Of interest is the number of molecules present (its mass), not its volume.
Similarly, when buying and selling products (custody transfer) the mass is important, not its volume.
Where are flow meters used? Or, What does a flow meter measure?
At industrial sites, meters that measure fluid flow are referred to as flow meters or flow sensors.
It is one of the most important instruments in industrial measurement.
With the development of industry, the accuracy and range of flow measurement requirements are getting higher and higher.
In order to adapt to various purposes, various types of flowmeters have been successively launched,
widely used in oil and gas, petrochemical, water treatment, food and beverage.
Industries such as pharmaceuticals, energy, metallurgy, pulp and paper, and building materials.
- Measurement of gas mass flow in industrial pipelines
- Smoke flow rate measurement from the chimney
- Calciner flue gas flow measurement
- Air flow measurement during gas process
- Compressed air flow measurement
- Gas flow measurement during semiconductor chip manufacturing process
- Gas flow measurement in sewage treatment
- Gas flow measurement in heating ventilation and air conditioning systems
- Flux recovery system gas flow measurement
- Measurement of combustion gas flow in a combustion boiler
- Gas flow measurement of natural gas, flare gas, hydrogen, etc.
- Measurement of carbon dioxide gas flow during beer production
- Measurement of gas mass flow in the production process of cement, cigarette and glass factory
- Open channel
Flow is the amount of fluid that passes through a pipe or device at a cross-section in a unit of time. This quantity is expressed by mass and is called mass flow. Expressed by volume, called volume flow. Expressed by weight, called weight flow.
Because the density of a fluid changes with changes in the state parameters of the fluid, the volume state must be given while specifying the state of the fluid.
Especially for gas, its density varies significantly with pressure and temperature. In order to facilitate the comparison of the volume flow rate, the volume flow rate in the working state is often converted to the volume flow rate in the standard state (temperature is 20 ° C and absolute pressure is 101325Pa).
Commonly used flow measurement methods include speed-type flow measurement methods, volumetric flow measurement methods, and direct or indirect methods to measure the mass of fluid flowing through the cross section of the pipe per unit time.
In the above method, more speed-type flow measurement method instruments are applied.
Except for the standard throttling device which does not need to be tested for the current flowmeter, almost all other flowmeters need to be calibrated when leaving the factory. During the use of the flowmeter, it should also be calibrated frequently.
The volume method is most commonly used. This is a method of measuring the volume of fluid flowing into a constant volume container within a measurement time to obtain the flow rate.
The mass method is a method of weighing the mass of a fluid flowing into a container within a measurement time to obtain a flow rate.
During calibration, a pump is used to draw the test fluid from the liquid storage container through the calibrated flowmeter and enter the liquid container.
The temperature of the fluid is measured while the weight is weighed to determine the density of the measured fluid at that temperature.
Divide the weight of the measured fluid by the density of the fluid at the measured temperature to obtain the volume of the fluid.
Comparing it with the meter’s volume indication (accumulated pulse number), the meter constant and accuracy of the calibrated flowmeter can be determined. The accuracy of this system can reach 0.1%.
The working principle of the standard volume tube method is based on the volumetric method (standard volumetric method), but it is a dynamic measurement.
The standard flowmeter comparison method is to connect the calibrated flowmeter and the standard flowmeter in series to the pipeline flowing through the test fluid, and compare the two measured values to find the error. The accuracy of the standard flowmeter is 2 to 3 times higher than that of the calibrated flowmeter.
How to Select Hydraulic flow Meter?
When searching for a flow meter for use in a particular hydraulic application, these five questions can help:
- What are the fluid properties?
- What is the hydraulic system operating condition
- Why is flow being measured; how accurately does the flow measurement need to be?
- What effect might the flow meter have on the fluid and vice-versa?
- How important is it to measure flow;
- what is your budget?
Sino-Inst offers over 10 Hydraulic flow meter for flow measurement. About 50% of these are Turbine flow meters, 40% is the mass flow sensor, and 20% are DP flow meter.
A wide variety of flow meters options are available to you, such as free samples, paid samples.
Sino-Instrument is a globally recognized supplier and manufacturer of flow measurement instrumentation, located in China.
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