Sino-Inst supplies GTL/C powder flow meter. The intelligent electrostatic powder flow meter continuously measures bulk solid materials in a process. The ring sensor is used. It is suitable for the measurement of solid mass flow in a wide range of metal-enclosed pipelines from kgh to th. The system is suitable for online monitoring of solid flow such as powder and dust conveyed by pipeline pneumatic conveying. Also known as pipeline solid flowmeter, solid powder flowmeter, intelligent electrostatic powder flowmeter, solid dust flowmeter, microwave solid flowmeter, etc. Applicable to: coal powder, mineral powder, lime, cement, flour, petroleum coke powder, etc.

How Do You Measure the Flow of Solids?

The Solid Flow Meter is based on the theory of contact electrification of solid materials. The powder material will accumulate a certain degree of electric charge during the process of pneumatic conveying or free fall.

Solid Flow Meter uses today’s advanced ring sensor. It can effectively capture every charged powder particle signal that passes through the ring sensor. It is amplified, shaped, and filtered by an amplifier circuit, and then processed by a high-speed processor. The final output is linear with the powder flow The standard current signal of the relationship.

The GTL/C powder flow meter is suitable for the measurement of solid mass flow in metal-enclosed pipelines with a wide range from kg/h to t/h. The system is suitable for online monitoring of the flow of solids such as powder and dust conveyed by pneumatic conveying. It can be widely used in electric power, metallurgy, cement, pharmaceutical, chemical, food manufacturing, and other industries.

Solid Flow Meter Selection Guide

When looking for a solid flow meter suitable for your process, Sino-Inst recommends that you make the best choice based on the following conditions:

• Maximum flow
• Material particle size
• Material temperature
• Bulk density/bulk density

After finding a solid flow meter suitable for your process according to the application conditions and material characteristics, you should also consider the following influencing factors:

• Wear: Wear will affect the life of the measuring piece. It is worth noting that changes in material flow will also cause significant wear.
• Adhesion: Materials should not adhere or accumulate on the surface of the measuring piece, as this will cause calibration deviations due to the buffering effect of adhered or accumulated materials.
• Corrosive: Corrosive materials will damage the flowmeter components. Corrosive gases are also worth noting.
• Airflow: Unstable and unpredictable airflow will affect the accuracy of airflow.
• Unsteady material flow: For uneven material flow, please choose a displacement sensor type solid flowmeter. Because the displacement sensor type solid flowmeter has the characteristics of mechanical hydraulic buffering.

Selection of the capacity of solid flowmeter draft tube:

Extended reading: GWR Solid Level Sensor-for Cement silo-Ash powder measure

Impact Plate Solid Flow Meter

Impact Plate Solid Flow Meter is used for metering equipment for powdery and granular materials with strong fluidity. Mainly suitable for closed material flow. Installation is restricted. Other occasions where similar products cannot be adapted. It is widely used in building materials, cement, chemical industry, coal, mining, ceramics, glass, metallurgy, grain, fertilizer, feed, port, electric power, coking, environmental protection and other industries.

Flow Meter Selection Guide 101: Find the Perfect Fit for Your Application

Microwave Solid Flowmeter-Gas Powder Explosion-Proof

The microwave solid flow meter uses the latest microwave technology. It is suitable for the measurement of solids in metal pipes.
Online flow measurement. All powder, dust, crumbs, and particulate matter can be measured repeatedly. The measurement range is as small as kilograms per hour and as large as tons per hour.
A microwave solid flowmeter is suitable for online measurement during pneumatic conveying or free fall. Therefore, it is an alternative product of a cost-effective weighing system.
MONITOR level monitor and display can be used on various occasions to detect the flow/non-flow state of powder and solid particles. Choose SFD-2 solid level monitor or SFI solid level display. Mainly based on the output type (relay or analog Quantity) requirements.

More Featured Flow Meters:

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Sino-Inst offers over 50 flow meter for flow measurement. About 50% of these are differential pressure flow meters, 40% is the liquid flow sensor, and 20% are Ultrasonic Level Transmitter and mass 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.

The differential pressure flow meter consists of a primary device and a secondary device.

The primary device is called the flow measuring element. It is installed in the pipeline of the fluid to be measured. It produces a pressure difference proportional to the flow (velocity). It is used for the secondary device to display the flow.

The secondary device is called a display instrument. It receives the differential pressure signal generated by the measuring element and converts it into the corresponding flow rate for display. The primary device of the differential pressure flow meter is often a throttling device or a dynamic pressure measuring device (pitot tube, velocity tube, etc.).

The secondary device is a variety of mechanical, electronic, and combined differential pressure meters equipped with flow display instruments. The differential pressure-sensitive components of differential pressure meters are mostly elastic components.

Since the differential pressure and the flow have a square root relationship, the flow display instruments are equipped with a square root device to linearize the flow scale.

Most meters are also equipped with flow totalizers to display the cumulative flow for economic accounting. This method of using differential pressure to measure flow has a long history and is relatively mature. Countries around the world are generally used on more important occasions. It accounts for about 70% of various flow measurement methods.

Extended Reading: Differential Pressure (DP) Flow Meters Technology

Extended reading: What Is Flush Diaphragm Pressure Sensor?

Featured Differential Pressure Flow Meters

Extended reading: ​Solid flow meter | For bulk solids-powder-soybean-cement 

Differential pressure flow meter calculation

Calculation formula 1: Conversion of differential pressure and flow rate of differential pressure flow meter

The differential pressure of a differential pressure flow meter is proportional to the square of the flow, or the flow is proportional to the square root of the differential pressure. Expressed by the following formula:

The scale unit of the flow meter is the flow percentage, and when the lower limit range of the differential pressure is 0, we get:

In the above formula:
△P is any differential pressure;
Q is any flow;
△Pmax is the upper limit of differential pressure;
Qmax is the upper limit of flow;
n is any percentage of flow

Extended reading: Measuring Flow With Pressure Sensors

[Calculation example 1]

The range of a certain differential pressure transmitter is 0-40kPa. The corresponding flow rate is 0-1603/h. The output signal is 4-20mA. What is the flow rate when the output current of the differential pressure transmitter is 8mA? What is the differential pressure?

Solution:

①Calculate the flow rate of the differential pressure flow meter according to the flow calculation formula

When the output is 8mA, the flow rate is 80m3/h.

②When the differential pressure transmitter is known to output 8mA. The flow rate is 80m3/h. The flow rate is 50% of full scale. Calculate the differential pressure value of the differential pressure transmitter according to the flow calculation formula

When the output current is 8mA, the differential pressure is 10kPa.

Extended reading: Industrial Pressure Transmitters|Buy from the manufacturer

Calculation formula 2: Conversion of volume flow in standard state and working state

The conversion formula of volume flow between standard state and working state is as follows:

In the formula,

qv is the volumetric flow rate under working conditions, in m3/h;
qn is the volume flow under standard conditions, in m3/h;
P is the absolute pressure under working conditions, the unit is Pa;
Pn is the absolute pressure in the standard state, in Pa;
T is the thermodynamic temperature under working conditions, in K;
Tn is the thermodynamic temperature in the standard state, in K;
Z is the gas compression coefficient under working conditions;
Zn is the gas compressibility coefficient under standard conditions;

Extended reading: how to calibrate a pressure transmitter

[Calculation example 2]

The design range of an airflow meter is 0-2000m3/h (at 20℃, 101.325kPa state). The pressure under working conditions is 0.5MPa. The temperature is 60°C. Find the volume flow under working conditions.

Solution: Substitute the data into the formula to calculate the volume flow under working conditions

The volume flow range of this flow meter is 0-460m3/h under working conditions.

Extended reading: Vortex Steam Flow Meter

Calculation formula 3: Calculation of changing range of standard orifice plate

Sometimes it is encountered in the field that the measured flow exceeds the maximum range of the orifice plate, or the flow is too small and can only be displayed below 30% of the maximum range. The emergency can be met by expanding or reducing the differential pressure range. The basis for changing the range is the formula. The maximum differential pressure and maximum flow rate of the flow meter in use are known. With these two parameters combined with the flow calculation formula, the calculation work for changing the range can be carried out.

Extended reading: wireless pressure transmitter working principle

[Calculation example 3]

There is an orifice flow meter, the original design differential pressure range is 0-60kPa. The flow range is 0-10000kg/h. The process flow of the expansion of production scale has exceeded the maximum flow of the orifice, and the range is planned to be expanded to 0-15000kg/h.

Solution: Calculate the corresponding maximum differential pressure according to the formula

The differential pressure value simply calculated above will have a certain error and is not a trade settlement. It can be used in general production sites. Uncertainty will not be a problem, but the pressure loss will increase. When changing the range of the orifice plate, the influence of many parameter changes should be considered comprehensively, and the iterative calculation method should be selected for the formal.

What is the difference between iterative calculation and simple calculation? The following is a comparative example

Extended reading: Liquid Bitumen/Asphalt Flow Meter

[Calculation example 4]

The original maximum flow rate of a certain steam flow meter was 70,000 kg/h, and the maximum differential pressure was 100 kPa. Because the actual flow is too small, the proposed maximum flow is 35000kg/h. The result of iterative calculation by computer is 35000kg/h, and the corresponding maximum differential pressure is 24.837kPa.

Solution: According to the formula, use a simple method to calculate the maximum differential pressure corresponding to 35000kg/h as 25kPa

If the result of the iterative calculation is taken as the standard value, the error of the simple calculation is:

Compared with the two methods, the error generated by the simple calculation method is 0.656%. Many production sites are still acceptable, especially for emergencies. Because the replacement of the orifice plate needs to be ordered and stopped. In order to reduce errors, some parameters (such as outflow coefficient, expansion coefficient, fluid density, etc.) can be indirectly corrected in the flow totalizer or DCS.

Change the range of the standard orifice plate by yourself, and first calculate it according to the flow calculation formula. Then set the range of the differential pressure transmitter according to the calculation result and calibrate it. Set the new parameters of the flow totalizer and DCS, then it can be put into use.

Changing the range of the orifice plate by yourself is restricted by conditions, that is, the newly changed range cannot exceed the 3:1 adjustable range of the standard orifice plate. The iterative calculation method is used when conditions permit. Or redesign the orifice plate.

Extended reading: Food grade flow meters for Food & Beverage industry

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Sino-Inst, Manufacturer for differential pressure flow meter. Including an Orifice plate, Venturi, Annubar, etc. Suitable for liquid, gas, and steam flow measurement.

Sino-Inst’s differential pressure flow meters, made in China, Having good Quality, With a better price. Our flow measurement instruments are widely used in China, India, Pakistan, the US, and other countries.

Sludge treatment (sludge treatment) refers to the reduction, stabilization, and harmless processing of sludge such as thickening, tempering, dewatering, stabilization, drying, or incineration. The higher the degree of sewage treatment, the more sludge residues that need to be treated.

Why use an electromagnetic flowmeter to measure the sludge flow rate?

The main reason for using an electromagnetic flowmeter to solve the flow of sludge is its low cost, high measurement accuracy, and good stability. Many flows measuring instruments can meet this requirement.

Featured Sludge Flow Meters

Read more about: Different Types of Flowmeters – Technical and Application Analysis

Return Activated Sludge

The wastewater treatment plant uses a secondary treatment process called activated sludge. This process converts non-sedimentable substances into biological flocs. This substance is produced in the aeration tank and settled in the final sedimentation tank.

Activated sludge is an aerobic process. It can promote the health of microorganisms and ensure effective treatment. The balance between food and oxygen and microorganisms must be maintained for optimal treatment. An element of maintaining biomass is to return a part of the sedimentation sludge from the final sedimentation tank to the aeration tank to maintain the balance of the biological system. This part of activated sludge is called RAS (Returned Activated Sludge).

The RAS is returned to the aeration tank via a variable-speed centrifugal pump. Accurate flow rate measurement is essential to ensure that the proper ratio of “food to microorganisms” is maintained. The RAS flow rate is determined by a microbiological health laboratory analysis, and the flow rate is adjusted accordingly.

Extended reading: Insertion Ultrasonic Water Flow Meter – Designed for Agricultural Irrigation, Garden Management

Sludge Flow Measurement of Return Activated Sludge Pipe

1 Project background

• DN 400mm stainless steel pipe;
• Full tube
• High pollution load, suspended solids content as high as 1%.

2 Measurement requirements

• Trouble-free and stable measurement of the horizontal conveying pipe of the return sludge conveyed by the screw pump lifting equipment;
• Due to high pollution load and gas load. The two existing measurements. Electromagnetic flowmeter + external clamp ultrasonic time difference method. Neither can work reliably or at all;
• The installation cost is low.

3 Solution

• Use NFP type cross-correlation flow measurement system;
• A hole was drilled upstream of the existing electromagnetic flowmeter. The NFP mounting piece was welded to the existing pipeline;
• Install a ball valve that can remove the sensor during operation, adjust and fix the cross-correlation sensor.

4 Advantages

• Simple and fast upgrade and transformation of existing facilities;
• The old flow measurement equipment does not necessarily need to be dismantled;
• Although the concentration of suspended solids in the water is high, the flow measurement is still reliable.

Read more about: Shop 101: Key Factors In Selecting A Pipe Flow Meter

Extended reading: Micro flow meters for low flow liquids

Advantages of electromagnetic flowmeter in sludge measurement

1. The electromagnetic flowmeter has no mechanical inertia. Responsive. Can measure instantaneous pulsating flow. It can also measure the flow in both directions.
2. The output of the electromagnetic flowmeter is only proportional to the average flow rate of the measured medium. It has nothing to do with the flow state (laminar or turbulent) under symmetrical distribution. Therefore, the electromagnetic flowmeter has a very wide range. The measurement range can reach 100:1, and some even reach the operable flow range of 1000:1.
3. The sensor structure of the electromagnetic flowmeter is simple. There are no moving parts in the measuring tube, nor any throttling parts that hinder fluid flow. So when the fluid passes through the flow meter, it will not cause any additional pressure loss. It is one of the flow meters with low energy consumption in the flowmeter.
4. The industrial electromagnetic flowmeter has a very wide caliber range. From a few millimeters to a few meters. Moreover, there are real-flow calibration equipment with a diameter of 3m in China. Laid a foundation for the application and development of electromagnetic flowmeters.
5. The electromagnetic flowmeter is a volume flow measuring instrument. During the measurement process, it is not affected by the temperature, viscosity, density and conductivity (in a certain range) of the measured medium. Therefore, the electromagnetic flowmeter only needs to be calibrated by water. It can be used to measure the flow of other conductive liquids.
6. It can measure the flow of dirty medium, corrosive medium and suspended liquid-solid two-phase flow. This is because there are no obstructing flow parts inside the meter measuring tube. The fluid to be measured is only in contact with the inner lining of the measuring tube and the electrode, and the material can be selected according to the nature of the fluid to be measured.

For example, use polytrifluoroethylene or polytetrafluoroethylene as the lining. It can measure various corrosive media such as acid, alkali and salt. The use of wear-resistant rubber as the inner lining is particularly suitable for measuring liquid-solid two-phase flows such as mineral slurry and cement slurry with solid particles and greater wear, as well as various suspended liquids such as fiber-containing liquids and pulps.

Extended reading: Orifice Plate Flow Meter

Can electromagnetic flowmeter measure sludge fluid with 85% moisture content?

Yes, there is no problem at all. I am the technology of the electromagnetic flowmeter manufacturer, and the measurement is no problem. It is only when the density of the sediment particles reaches a certain level. There will be peak fluctuations. However, the measurement is no problem.

Extended reading: ultrasonic sludge level meter

Which lining material electromagnetic flowmeter is used for sludge flow meter?

What kind of flowmeter can be used for sludge flow measurement. According to the characteristics of the sludge medium, the flow rate of the sludge can be measured by using an electromagnetic flowmeter. The electrode material uses tantalum electrode, and the lining material uses ceramic material or tetrafluoroethylene. In this way, the sludge flow measurement conditions can be solved.

More about:

Learn More about Sludge Treatment

Before sludge treatment, we must first understand the classification of sludge:

1. Treatment of physicochemical sludge discharged from sedimentation tank or thickening tank of waterworks. It is a medium and fine-grained organic and inorganic mixed sludge. The compressibility and dehydration performance are average.
2. The remaining activated sludge discharged from the secondary settling tank of the domestic sewage plant is hydrophilic, fine-grained organic sludge, with poor compressibility and poor dehydration performance.
3. Treatment of physicochemical and biochemical mixed sludge discharged from the thickening tank produced by industrial wastewater treatment. It is a medium-fine-grained mixed sludge. The dewatering performance of the fiber-containing body is better. The other compressibility and dewatering performance are average.
4. The physical and chemical fine-grained sludge produced by the physical method and chemical method discharged from the thickening tank from the industrial wastewater treatment. It belongs to the fine-grained inorganic sludge. The compressibility and dewatering performance are general.
5. Physical and chemical precipitation of coarse-grained sludge produced by industrial wastewater treatment. It belongs to coarse-grained hydrophobic inorganic sludge. It has good compressibility and dewatering performance.

Extended reading: Stainless steel flow meters|304-316 optional

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Sino-Inst offers Sludge flow meter products. About 85% of these are Magnetic flow meters, 3% are Ultrasonic water meters. A wide variety of Sludge flow meter options are available to you, such as free samples, paid samples.

The top-selling countries or regions are China, India, and Israel, which supply 99%, 1%, and 1% of sewage flow meter respectively. Sludge flow meter products are most popular in Domestic Market, Mid East, and North America. You can ensure product safety by selecting from certified suppliers, with ISO9001, and Other certifications.

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Paddle wheel flow meter Features

1. Has good anti-interference
2. Strong signal transmission capability (the farthest transmission is 300 meters)
3. Stable quality and low failure rate
4. Superior performance-price ratio
5. Wide range measurement.
6. All measurement parameters can be adjusted independently.
7. Output 4-20mA or RS485 communication output, two pairs of alarm output contacts.
8. Display real-time flow and cumulative flow.
9. Insertion installation.

Application range of impeller flowmeter

• Flow monitoring of industrial water treatment process
• Industrial circulating cooling water and make-up water flow monitoring
• Reclaimed water flow monitoring
• Process flow monitoring after wastewater treatment
• Agricultural irrigation water flow measurement
• Multi-way valve and multi-valve system flow monitoring for softening, filtering, etc.
• Other water flow detection and control

Extended reading: Insertion Ultrasonic Water Flow Meter – Designed for Agricultural Irrigation, Garden Management

Paddle wheel flow meters parameters

Picture
Model	KF11 Corrosion-resistant flow sensor	KF11 series impeller flow meter
Description	Suitable for highly corrosive fluids, sulfuric acid, nitric acid, hydrofluoric acid, hydrochloric acid, mixed acid, strong alkali and other places; The flow parts are made of corrosion-resistant materials such as PVDF·PTFE·Hastelloy·Titanium alloy; there is almost no pressure loss and maintenance-free; Flow velocity range 0.3-6m/s, can measure fluid with flow velocity greater than 0.3m/s; Not applicable to media containing particles and fibrous impurities;	The impeller adopts a five-piece runner design PP/PVDF/PTFE material Better guarantee the dynamic balance characteristics, greatly improving the linear accuracy and repeatability accuracy of the sensor; The minimum flow rate is 0.1m/s; NPN open collector output, which can be directly transmitted to a flow transmitter or PLC, a standard square wave signal and a maximum distance of 300m; Applicable caliber: DN25-DN600 (1″-24″); Not suitable for particles and fibrous impurities The medium;
Caliber range	DN25-DN600(1″-24″)	DN25-DN600(1″-24″)
Flow rate range	0.3-5m/s	0.1-8m/s
Output signal	Square wave pulse signal: (40-45Hz) nominal flow rate per m/s	Square wave pulse signal: (40-45Hz) nominal flow rate per m/s Equipped with pulse conversion components can output 4-20mA
Characteristic	Hall pulse output, open collector NPN, strong driving ability Has high chemical resistance Minimum flow rate 0.3m/s IP68 protection grade suitable for harsh on-site environment	Hall pulse output, open collector NPN, strong driving ability Has high chemical resistance IP68 protection grade suitable for harsh on-site environment Plug-in type, easy installation, good reliability, almost maintenance-free
Linear accuracy L Repeatability accuracy R	L=±1% R=±0.5%	L=±1% R=±0.5%
Ontology	PVDF/PTFE	PP plus glass fiber/CPVC
Impeller	PVDF/PTFE	PP/PVC/PVDF/PTFE
Shaft and bearing	Hastelloy C/Titanium Alloy/ZrO2	Al2O3/ZrO2/SS316L/Hastelloy C/Titanium Alloy
O-ring	fluororubber	FPM/EPDM/Fluorine rubber
Temperature and pressure	PVDF body: 12.5bar@25℃-2.5bar@100℃ PTFE body: 12.5bar@25℃-2.5bar@100°	PP body: 12.5bar@25℃-1.7bar@80℃ CPVC body: 12.5bar@25℃-1.7bar@80℃
Power supply system	DC 5-24V	DC5-24V
Protection level	IP68	IP68
Application field	Sulfuric acid ratio and delivery flow monitoring Copper sulfate monitoring in electroplating bath Nitric acid mixture Intermediate Chemical waste	Pure Water Process/Reverse Osmosis/Ultrafiltration/EDI Water purification and filtration system Cooling water and boiler water monitoring Chemical industry Agricultural irrigation Cleaning system and single crystal silicon cleaning Pump protection

Check more Choosing The Right 1 Inch Flow Meter.

Paddle wheel flow meter working principle

The sensor is divided into two parts: the transmitter and the impeller. The impeller is in direct contact with the fluid, and the transmitter is isolated from the fluid. The liquid flow drives the impeller to rotate, and there are four evenly distributed magnetic blades on the impeller. The rotating magnetic blade induction Hall switch generates a frequency signal proportional to the flow rate, and the transmitter converts the frequency signal into a 4-20mA current signal.

Typical Paddle wheel flow meters are water meters and turbine flow meters. The structure can be a mechanical transmission output type or an electric pulse output type.

The accuracy of water meters with general mechanical transmission output is low, with an error of about ±2%. However, the structure is simple and the cost is low. It has been mass-produced in China, and is standardized, generalized and serialized. The accuracy of the turbine flowmeter output by the electric pulse signal is relatively high, and the general error is ±0.2%-0.5%

The five-piece impeller design is in line with the principle of fluid mechanics, and the uniform force angle produces a better dynamic balance, ensuring better linear accuracy and repeatability accuracy

Various shafts and bearings:
Shaft and bearing: ZrO2, SS316L, Hastelloy C
Impeller material: PTFE, PP, PVDF, ABS
Body material: PP plus glass fiber, ABS, CPVC, PTFE, SS316L, brass

Real flow calibration
Calibration range: DN10-DN1000
Each sensor has undergone strict calibration and quality inspection. When leaving the factory, each sensor guarantees that the K factor is 2% of the standard value, and the repeatability accuracy is 0.5%;

Read more about: What is an inline flow meter?

Paddle wheel flow meter advantages and disadvantages

Extended reading: How to Select the Right Agriculture Flow Meter

Paddle wheel flow meter installation

• The straight section behind the flange must meet the measuring distance of the first 10 and the rear 5 times the pipe diameter;
• After reducing the diameter (only allowed to change from large to small, but not allowed to change from small to large), the straight line segment needs to meet the measurement distance of the first 15 and the back 5 times the pipe diameter;
• The straight section behind the first-level equal-diameter elbow needs to meet the measuring distance of the first 20 and 5 times the pipe diameter;
• The straight section behind the two-stage continuous equal-diameter elbow on the same plane must meet the measurement distance of the first 25 and the rear 5 times the pipe diameter;
• The straight section behind the non-coplanar two-stage continuous equal-diameter elbow needs to meet the measuring distance of the first 40 and the back 5 times the pipe diameter;
• The straight section behind the valve must meet the measurement distance of the first 50 and the last 5 times the pipe diameter;
• The probe is recommended to be installed perpendicular to the pipe, and not at the bottom of the pipe;
• The probe can be installed on a vertical pipe where the liquid flows upward, but it must also meet the requirements of the above-mentioned straight section;
• The probe is not allowed to be installed on a vertical pipe where the liquid flows downward;
• The liquid in the tested pipeline must be full of flow, and no gas and liquid can flow at the same time;
• The cost of the body must be consistent with the bayonet (open slot) to ensure the correct installation position;
• The O-ring has a good sealing effect. When the installation is tight, it needs to be wetted with silicone oil or water for installation;
• The sensor locking cap must be tightened to prevent excessive pressure in the pipeline from leaking or ejecting;
• When installing outdoors, pay attention to waterproof treatment; keep the cables dry to avoid moisture damage;
• Do not lay the sensor cable and AC power cable in the same protective tube to avoid electrical interference

Extended reading: Industrial VS Residential inline water flow meters

More Featured Paddlewheel flowmeters

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Sino-Inst, paddle wheel flow meter manufacturer. It can measure a single sound-conducting liquid medium of Velocity range: 0.1~6m/s; Pipe diameter: DN15 to DN600.

Sino-Inst’s paddle wheel flow meter, made in China, Having good Quality, With a better price. Our flow measurement instruments are widely used in China, India, Pakistan, the US, and other countries.

Piston flow meter technology

Piston-type flowmeters are commonly used for flow measurement of fuel dispensers. Its structure includes a housing, an upper cover, a lower cover, a piston, a crankshaft, and a distribution valve. The inner cavity of the housing is equipped with four-piston cylinders that cooperate with the piston dynamic seal. The four-piston cylinders are evenly distributed in the circumferential direction on the vertical plane of the crankshaft rotation centerline.

The piston is connected to the crankshaft by a connecting rod. The piston rodless cavity is connected to the inlet and outlet on the upper cover through the distribution valve. A side cover is installed on the casing outside the piston cylinder. The upper cover is equipped with an output shaft that rotates synchronously with the crankshaft. By right Count the number of revolutions of the output shaft to achieve flow measurement.

• The main disadvantages are:
• The outer circular surface of the output shaft of the existing piston flowmeter and the upper cover adopts O-ring dynamic sealing cooperation.
• The high-speed rotation of the output shaft is likely to cause wear to the sealing ring, resulting in a decrease in sealing performance and even leakage.
• In addition, there are errors in the machining dimensions of the inner cavity of the piston-cylinder of each product. Lead to the measurement error of the piston flowmeter.

Read more General-purpose Flow Totalizer for Data collection and calculation

Features and applications of Piston flow meter

The piston flow meter has a simple structure, reliable work, and a large measuring range.
The measurement accuracy is high and is not affected by viscosity. It can be changed remotely and other advantages.

However, the main components of the measurement part are not corrosion-resistant. Therefore, it can only measure non-corrosive media, such as heavy oil and other petroleum products.

Extended reading: Cylinder Gear flow meter for micro flow measurement.

Piston flow meter working principle

A piston flow meter is a positive displacement flow meter, which is based on the fact that the piston and the metering chamber have been kept in a tangential sealed state. And there is a fixed eccentric distance metering element piston.

Under the action of the pressure difference, a rotational torque is generated on the piston, which makes the piston perform an eccentric rotation movement.

The number of revolutions of the piston is proportional to the flow rate of the fluid. The piston revolution ratio is recorded by the counting mechanism. Then the total flow of fluid can be measured.

The inlet and outlet of the Piston flow meter are separated by a partition. When the measured fluid enters the metering chamber from the inlet, a pressure difference is formed at the inlet and outlet, forcing the piston to rotate counterclockwise as shown in the figure.

The continuous flow of fluid forces the piston to rotate as shown in the figure, forming two and a half-crescent cavities. The piston is forced to rotate under the action of the pressure difference as shown in the figure. V2 fluid is discharged from the outlet. Rotate under the action of pressure difference. V1 fluid is discharged from the outlet, and the fluid bursting out every revolution of the piston is equal to the sum of V1+V2.

Tool: Volumetric Flow Rate & Pipe Diameter to Flow Speed Calculator

Piston flowmeter output signal, such as 4-20mA. The flow signal can be connected to a paperless recorder. Carry out multi-channel flow signal monitoring. What Is A Paperless Recorder?

Piston flowmeter VS gear type flowmeter

Gear flow meters are a type of positive displacement flow meters, used for precise continuous or intermittent measurement of the flow or instantaneous flow of liquid in the pipeline. It is especially suitable for the flow measurement of heavy oil, polyvinyl alcohol, resin, and other high viscosity media.

Piston type flowmeter is an online installation, mechanical flow switch, used for liquid or gas medium. Very small pressure loss, good repeatability, anti-fouling ability, mechanical part, and electronic part are completely isolated, suitable for small flow economy type.

If the flow rate you want to measure is not large, the piston type is better.
If you want to measure a large flow rate, just use a gear type.
If the gas flow is measured, only the piston type can be used

Extended reading: Positive displacement flow meter working principle.

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A Piston Flow Meter is an innovative device that accurately measures fluid flow in pipelines. Sino-Inst, a well-established manufacturer and supplier of Piston Flow Meters, boasts a wealth of experience in the field.

With our top-notch product line, Sino-Inst is the perfect partner for all your flow measurement needs. If you’re in the market for a reliable and efficient Piston Flow Meter, look no further! Contact Sino-Inst today and let them show you what they can do.

And that’s not all, Sino-Inst also offers a range of other flow meters, including turbine flow meters, magnetic flow meters, and more. Let Sino-Inst help you find the perfect flow meter solution for your specific application!

Can the flow meter perform bidirectional measurement?

If the flow direction of the medium in the pipeline is reversed. Does the flow meter need to be installed with a flow meter for forwarding use and a flow meter for reverse use accordingly? Is there a flow meter for normal measurement that does not consider the flow direction?

1. If you just look at the flow rate, you can. For example, an electromagnetic flowmeter. It doesn’t matter if you measure in the whole direction or in the reverse direction. Change the reverse measurement to allow in the prerequisite electromagnetic flowmeter settings.
2. It’s hard to say if you still need a cumulative amount. How do you convert the cumulative amount you measured forward and the cumulative amount you measured backward? Whether to subtract or add depends on your actual situation.

Extended reading: Insertion Ultrasonic Water Flow Meter – Designed for Agricultural Irrigation, Garden Management

How does the ultrasonic flowmeter realize bidirectional flow measurement?

The principle of the ultrasonic flowmeter is to calculate the fluid flow rate using the difference in sound velocity. And multiply the fluid velocity by the area to calculate the volume flow.

Usually, there is an incident angle between the probe of the ultrasonic flowmeter, that is, the transducer and the meter body. From 60 degrees to 45 degrees. Ultrasonic waves propagate between a pair of probes if there is no fluid, that is, at zero flow. The travel time back and forth is the same. It is equivalent to a zero flow rate.

Extended reading: Ultrasonic Flow Meters Types & Technical Guide

Once there is fluid, the speed of the ultrasonic flowmeter back and forth between a pair of probes is different. Regardless of the direction of fluid flow, there will be a difference in sound velocity. If one direction is set as the normal flow direction, then the normal sound velocity should be a positive number. If the sound velocity difference is negative, the flow is in the opposite direction. That is reverse measurement. The measurement accuracy of the two directions is the same.

Extended Reading: Inline Ultrasonic Flow Meter

Can a vortex flowmeter measure bidirectional flow?

You cannot measure bidirectional flow with just one vortex flowmeter. But in some applications, you can use two for this.

The vortex flowmeter has a bluff body in front of the sensor, which is used to generate the vortex in the flow. As far as I know, no flowmeter has two bluff bodies to measure bidirectional flow.

If you have a two-way steam application. Then you can install two vortex flowmeters in the same line, as long as you respect the inlet and outlet operation of both. However, depending on the size of the line, this setting may become expensive.

Read more General-purpose Flow Totalizer for Data collection and calculation

Bidirectional orifice flowmeter

The bidirectional orifice flowmeter is a differential pressure flowmeter. Mainly used for flow measurement of liquid and gas. According to the characteristics of the orifice flowmeter, it has the advantage of high temperature and high pressure. Therefore, the orifice flowmeter is widely used in the field of high temperature and high-pressure measurement. The orifice flowmeter has high accuracy and good stability and is unanimously recognized by users.

What kind of measurement conditions will use an orifice flowmeter to measure? It can be used according to the requirements of the site, such as typical boiler steam, the general temperature can be close to about 500 degrees, and general flow meters cannot be used. However, the orifice flowmeter can effectively solve this high-temperature working condition, and the only disadvantage is its high cost of use.

Extended reading: 2 inch Water Flow Meter

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Sino-Inst offers over 50 flow meters for flow measurement. About 50% of these are differential pressure flow meters, 40% are the liquid flow sensor, and 20% are Ultrasonic Level Transmitter and mass flow meters.

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.