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rotameter variable area flow meter
variable area flow meter, commonly called rotameters, are a cost-effective solution for flow measurement of liquids and gases. The VA meter has excellent measurement repeatability, which provides process stability and consistency.
External power is not required for operation; therefore, they deliver a fail-safe flow rate under any circumstance.
VA flow meters can be made from a variety of wetted materials for process fluid compatibility, high-pressure and high temperature conditions, and hazardous locations.
The variable area technology was invented in Germany more than 100 years ago. A variable area flow meter is often called a rotameter because the float spins (rotates) as the flow passes it. The spinning float is a clear indication that the fluid is flowing.
The industry need for remote monitoring of the process created more opportunities for rotameters. We introduced meters with flow alarms that could be set for a specific flow point and meters that provided pneumatic and analog outputs that corresponded to flow. HART and Fieldbus communications were later additions to the product.
Today, the variable area meter is capable of measuring flow rates with process pressure approaching 20,000 psi/1350 bar and process fluid temperatures of 750 °F/420 °C. Even though the technology is more than 100 years old, it is still a respected technology.
The Instrument has a broad line of variable area meters that serve many industries and handle the toughest applications.
Main parameters
| Measuring range |
Water (20 centigrade): 5 to 200000L/h Air (0.1013Mpa 20 centigrade): 0.03 to 4000m3/h |
| Measuring range ratio | 10:1 (Special 20:1 optional) |
| Accuracy | 1.5% (1.0% optional) |
| Working pressure |
DN15 to DN50 PN4.0Mpa (32Mpa optional) DN80 to DN200 PN1.6Mpa (25Mpa optional) |
| Medium temperature |
Standard: -80 to +140 centigrade High temp. type: 350 centigrade |
| Environment temp. | -40 to +120 centigrade (Remote output lower or equal than 85 centigrade) |
| LCD display | Instant flow:0 to 20000, acumulation flow: 0 to 99999999 |
| Output | Standard signal: two wire 4 to 20 mA, Pulse signal 0 to min interval 50ms |
| Power supply |
Standard: 24VDC (10.8 VDC to 36VDC) 220VAC (85 to 265VAC) Battery type: 3.6/5.2AH Li-ion battery. |
| Connection type |
Flange DIN2501 or optional Thread DIN11851 or optional |
| Electric port | M20*1.5, PG11, 1/2 inch NPT |
| Overall height | Standard 250mm (Vertically install) |
| Protection | IP65 |
| Ex-proof | ExiaIICT3-6 or EXdIIBT4 |
Principle of Operation – Variable Area
There are five primary elements to a variable area flow meter (rotameter):
- Metering tube – a tapered chamber that contains the fluid and the float
- Float – a spherical or symmetrically shaped object that moves up or down based on flow rate
- Scale – a device marked with increments of the flow units used to read the flow rate
- Process connections (end fittings) – the flanged or threaded assembly that the customer uses to connect the process fluid lines – along with meter size, this is very important to the customer
- Body or housing – the frame or structure that contains the metering tube, float, scale and customer connections
A variable area meter (rotameter) is a flow meter that measures volumetric flow of liquids and gases. Its operation is based on the variable area principle, where flow raises a float in a tapered tube, increasing the area for passage of the fluid flow. The float will reach a stable position when the force exerted by the flowing fluid + the buoyancy equals the gravitational force.
A change in flow rate upsets this force balance and the float will move up or down until it again reaches a position where the forces are in balance. The pressure drop across the float is low and remains essentially constant as the flow rate changes.
Float response to flow rate changes is linear and usually a 10 to 1 flow range is standard. Variable area meters can be installed directly after pipe fittings or valves without adverse effects on the meter accuracy. The meters are also inherently self-cleaning since the flow of gas or liquid between the tube wall and the float provides a scouring action that discourages the build-up of foreign matter.
The forces or influences involved in the rotameter can be seen in the diagram below.
1. One-stop service for flow instrument including the related products
2. OEM for many company in domestic
3. 18 months guarrantee after shipment and
4. Quick response in order
5. Complete sales service not just post-sales but before purchasing
6. Partnership cooperation and support
Kaifeng Kaide Flow Instrument Co., Ltd., established in 2002, is a high-tech enterprise specialized in the R&D and manufacture of flow instruments. Located in the base of Chinese flow instrument - Kaifeng City, we have full access to the most advanced technology and thus intend to deliver our high-quality service internationally with great confidence.
At present, we are mainly dealing in Electromagnetic Flowmeters, Vortex Flowmeters, Turbine Flowmeters and some kinds of Throttling Devices. As we put a lot of attention into quality control, we attained ISO9001:2000 QMS (Quality Management System) certification at a very early time.
Our commitment has won us a lot of reputable domestic customers from Chinese oil giant - Zhongyuan Oil Field to famous research institute of Wuhan University of Technology. They all established a pleasant and long-term business relationship with us. We also expanded our service to overseas markets and plenty of foreign customers visited our company to bond us in technology and business. We have been providing OEM service for many domestic and overseas customers.
"Accuracy and attitude" is our motto. We believe that, with high-quality products and services, long-term relationships are always available between worldwide guests and our company.
1. When do we need a flow meter?
If you ust want to know the moving rate of a liquid or gas through a pipeline, a simple flow indicator is available from any flowmeter vendor which is enough. Simple and easy to install and requiring wihout external power, these instruments can be used to provide local indication of flow.
When there is a demand for something more sophisticated, such as an indication of flow within 10%, there may need to purchase a flowmeter. Many installations typically feature bends or joints that can be readily converted into a crude flowmeter by purchasing a differential pressure transmitter and installing sensors to measure the difference in pressure between two or more points. Provided that calibration can be correctly achieved, these simplified flowmeters can achieve an accuracy of around 5%, Kaide Flow Instrument Co.Ltd. can provide more accurate flow meter for widely application in liquid and gas and so on.
2. How can we choose a suitable flow meter?
Please confirm us the mesuring medium, working tempreture, measuring range, we'll help to select the suitable meter.
3. Why must we choose Kaide as flowmeter partner?
China'sflow instruments base is in Kaifeng, Kaide Flow Instrument Co.Ltd. is one of the earliest and largest flow instrument manufacturers in Kaifeng, we have the advantage and confidence to meet most clients's requirement.
4. How are variable area (rotameters) used?
VA meters are widely used in a diverse range of applications, from simple to sophisticated.
Here are details of a few typical applications:
Process Analyzers
Process analyzers are designed to accurately and continuously measure a target analyte in a process stream. Sampling is the single most critical issue for process analysis. When the sampling system becomes plugged, it can cause big problems and costly, unscheduled maintenance.
The variable area flow meter – with 4-20 mA output – continuously monitors sample flow to the analyzer, unlike a flow alarm or flow switch. When flow starts to drop – indicating the onset of plugging – users can schedule maintenance to clear the problem before the analyzer is starved of the sample. Rotameters without 4-20 mA output are often used for sample flow in analyzer applications.
Rotating Equipment
Large rotating equipment requires effective and reliable flow monitoring on a number of fluid supplies – like lubrication fluids, coolants, and dry gas seal gasses – to ensure efficient and safe operation. Metal tube variable area meters are commonly used to monitor lube oil and coolant flows. The optimum solution is using a 4-20 mA transmitting variable area meter so that flow can be continuously monitored. But glass tube or plastic body variable area meters are frequently used to ensure proper flow to dry gas seals.
Offshore Oil Platforms
Operators of offshore platforms require reliable products that operate under extreme conditions such as high pressure and difficult environmental conditions. Common offshore applications involve injecting a fluid (many times a proprietary fluid) into the high pressure extraction fluid to either prevent corrosion, prevent freezing of the extraction fluid, or add lubrication. In all cases, the goal is to provide local monitoring of the extraction process, which improves the overall process yield. Since the extraction process normally operates under very high pressures, the flow meter choices are limited. The model 3809 variable area meter is an excellent choice because it is simple, proven, reliable (only one moving part) and is available for operating pressures to 20,000 psi/1350 bar. The unique 3809 meter will have heavy wall construction with stainless steel indicator housing. If remote monitoring is required, the model 3809 can be supplied with 4- 20 mA analog output and worldwide approvals.
Additional variable area meter applications:
- 1.
- – controls the flow rate of the fluid to be mixed (added) to the primary fluid
- 2. Boiler control – measures steam flow to a boiler or measure the gases that heat the boiler
- 3. Purge applications –controls the purge gas or liquid to keep process lines clear, to create a positive pressure and/or be the shielding gas in a contained welding application, or to create a positive pressure where electrical components are installed in an area where hazardous gases could explode if they entered the electrical compartment
- 4. Tank blanketing – inert gas is the “blanket” over the liquid in a tank, which prevents the liquid from giving off vapors which could ignite and then explode
- 5.
- – options such as flow switch (alarm) or continuous electronic output (4-20 mA output with HART) allow flow conditions to be monitored and controlled remotely; a valve is also available to maintain flow at a given set-point.
5. Does a low signal effect accuracy?
Yes, if when the signal levels goes below 25% the accuracy will be affected.
6. If there is no temperature compensation, how does a change in application temp effect the accuracy?
+/- 10°C will affect the accuracy by 1%. If the temperature increases a significant amount the signal may be lost altogether. A higher temperature gives a wider separation distance, so if the sensors haven’t moved along with the temperature, then the signal will not be received.
For more iformation in your flow meter needs , please contact us at any time
rotameter variable area flow meter
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