Rotameter Flow meters ( Variable Area )

Name: Rotameter Flow meters ( Variable Area ) | Sino-Inst
Brand: Sino-Inst
SKU: Rotameter Flow Meters-Metal Variable Area Flow Meters
Price: 299 USD
Availability: InStock

Rotameter Flow Meter is a process instrument used to measure the volume flow of pipeline gas or liquid. It adopts the variable area measurement principle. It has the characteristics of small size, large detection range, and easy use. It can be used to measure the flow of liquids and gases. It is especially suitable for medium flow measurement with a low flow rate and small flow rate.

The Rotameter Flow Meters produced by our Sino-Inst support the customization of DN15~DN200. Can be configured with explosion-proof, intelligent transmitter, output 4-20mA signal, and HART protocol. Two alarm outputs can be configured.

RFQ DP Flow Meters

Features

Suitable for flow measurement of large-caliber, low-flow-rate media;
Low requirements for front and rear straight pipe sections;
Pointer indicates instantaneous flow, LCD double-row displays instantaneous flow and cumulative total (optional);
All-metal structure, suitable for high temperature, high pressure, and highly corrosive media;
Can be used in flammable and explosive hazardous places;
With data backup and power-off protection functions (LCD display type);
Reliable operation, low maintenance, long life;
Wide range ratio 10:1;
Multi-parameter calibration, keyboard setting alarm (with alarm type);
Optional external power supply or built-in 3.6V lithium battery power supply;

Rotameter Flow Meters Technical Parameters

Measuring range	Water (20℃): 1-200000 L/h Air (20℃, 0.1013MPa): 0.03~4000m³/h
Turndown	Standard type 10:1, special type 20:1
Accuracy	Gas 2.5%FS; Liquid 1.5%F.S
Pressure Level	Standard type: DN15-N50 4.0MPa; Special type: DN15-N50 25 MPa; The pressure rating of the jacket is 1.6MPa. For special models, please consult and confirm before selecting and ordering.
pressure loss	2kpa-20kpa
Medium temperature	Standard type: -40℃~100℃; PTFE: 0℃~120℃; High temperature type: 100℃~450℃;
Medium viscosity	DN15: η<5mPa.s(F15.1-F15.3) η<30mPa.s (F15.4-F15.8) DN25: η<30mPa.s DN50-DN150: η<30mPa.s
ambient temperature	Remote transmission type: 40℃~185℃ (the liquid crystal will not be damaged), the liquid crystal normally works at -30℃~80℃; local pointer type: -40℃~100℃
Connection Type	Connection method: flange connection standard HG20592-2010, DIN 2501 standard flange; or produced according to customer requirements; Threaded connection: produced according to diameter or customer requirements; Sanitary clamp connection: produced according to diameter or customer requirements;
Cable interface	The flameproof type is 1/2NPT internal thread; other M20*1.5 internal thread;
Power supply	Standard type: 24VDC two-wire system 4-20mA (12VDC-32VDC); Alarm type: 24VDC three-wire system 4-20mA (18VDC-28VDC); AC type: 85-265VAC50Hz; Battery type: 3.6V, 7.5AH battery, used continuously for three years;
Load characteristics	Two-wire system: RLmax=50*(-12)Ω=600Ω@24V Alarm type: the maximum load resistance is 200Ω AC type: the maximum load resistance is 200Ω
Alarm Output	Upper or lower limit instantaneous flow alarm; Switch quantity alarm; Relay output;
LCD	Instantaneous flow rate display value range: 0-50000 (with decimal point) Accumulated flow display value range: 0-99999999 (with decimal point) automatic reset
Protection level	IP65

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Flow Range

Liquid(L/h)			Gas
Nominal Diameter	Material RO.R1,R2,TI,RL	Materlal PTFE	Nm³/h (under standard state)
DN15	1～10	1.6～16	0.03～0.3
	6～16	2.5～25	0.05～0.5
	2.5～25	4.0～40	0.07～0.7
	4.0～40	6.0～60	0.11～1.1
	6.3～63	10～100	0.18～1.8
	10～100	16～160	0.28～2.8
	16～160	25～250	0.48～4.8
	25～250	40～400	0.7～7
	40～400	60~600	1.0～10
	63～630		1.6～16
	100~1000
DN20	63~630	40~400	1,6~16
	80~800	63~630	2.4~24
	100~1000	80~800	3.6~36
DN25	63~630	40~400	1.6~16
	100~1000	63~630	3~30
	160~1600	100~1000	4.5~45
	250~2500	160～1600	7~70
	400~4000	250~2500	11~110
DN32	500~5000	400~4000	14~140
	800~8000	500~5000	23~230
	1000~10000	800~8000	35~350
	1500~15000	1000~10000
DN40	630~6300	400~4000	18~180
	1000~10000	630~6300	25~250
	1200~12000	1000~10000	40~400
	1600~16000	1200~12000
DN50	630~6300	400~4000	18~180
	1000~10000	630~6300	25~250
	1600~16000	1000~10000	40~400
	2000~20000	1500~15000
DN65	1600~16000	1000~10000	40~400
	2000~20000	1600~16000	65~650
	2500~25000	2000~20000	100~1000
	3000~30000	2500~25000
DN80	2500～25000	1600～16000	70～700
DN80	4000～40000	2500～2500	100~1000
DN100	6300～630000	4000～40000	160~1600
DN100	1000～100000	6300~63000	250~2500
DN125	12000~120000	10000~100000	300~3000
DN150	16000~160000	12000~120000	400~4000
DN200	20000～200000	It can be DN20,DN32,DN40,DN65,DN125 for special.
DN200	20000～200000	Please contact and consultant with the manutadurer

Structure of rotameter flow meter

This series of metal tube rotameter flow meters mainly consists of two parts: measuring tube and indicator.

The measuring tube includes tapered tube, guide, stopper, float and other components.

The indicator includes a magnetic follow-up system, pointers, dials, circuits and other components. Divided into local type and intelligent type.

For the local type, the following magnet in the local indicator is coupled with the magnet in the float to rotate, and at the same time the pointer is driven to indicate the flow rate at this time through the dial.

For the intelligent type, the following magnet in the intelligent indicator is coupled with the magnet in the float to cause rotation. At the same time, it drives the sensing magnet and pointer. The changes in the magnetic field are converted into electrical signals through a magnetic sensor, which is then processed by AD conversion, digital filtering, temperature compensation, microprocessor processing, D/A output, and LCD display to display the instantaneous flow and accumulated flow.

Rotameter flow meter working principle

The structure of a rotameter flow meter is a vertical tapered metal tube whose cross-sectional area gradually expands from bottom to top. There is a rotor (or float) made of metal or other materials that can rotate freely. The fluid to be measured enters from the bottom of the metal tube and flows out from the top.

When the fluid flows through the vertical tapered tube from bottom to top, the rotor is acted upon by two forces: one is the vertical upward pushing force, which is equal to the pressure difference generated by the fluid flowing through the annular cross-section between the tapered tube and the rotor.

The other is the vertical downward net gravity, which is equal to the gravity on the rotor minus the buoyancy force of the fluid on the rotor. When the flow increases so that the pressure difference is greater than the net gravity of the rotor, the rotor rises. When the pressure difference is equal to the net gravity of the rotor, the rotor is in equilibrium. That is to stay in a certain position.

A reading is engraved on the outer surface of the metal tube. According to the dwell position of the rotor, the flow rate of the measured fluid is read.

The rotameter is a variable cross-section constant pressure differential flowmeter. The pressure difference acting on the upstream and downstream of the float is a constant value. The annular cross-sectional area between the float and the tapered tube changes with the flow rate. The position of the float in the tapered tube reflects the flow rate.

Advantages:

Metal float flowmeter is suitable for small pipe diameters and low flow rates. It is suitable for measuring low flow rate and small flow. Taking liquid as an example, the flow rate is between 0.5-1.5m/s.
The float flowmeter has a wide flow range, generally 10:1. Pressure loss is low.
The float flowmeter can be used at lower Reynolds numbers. By choosing a float with a viscosity-insensitive shape, the flow coefficient remains constant when the Reynolds number changes, that is, changes in fluid viscosity do not affect the flow coefficient.
The float flowmeter has no requirements for the upstream straight pipe section. Most float flowmeters are installed in pipelines with vertical flow from bottom to top.

Disadvantages:

The application of float flowmeter is limited to small and medium pipe diameters. Ordinary full-flow float flowmeters cannot be used for large pipe diameters. The maximum diameter is generally DN200mm.
When the fluid used is different from the factory calibration fluid, the flow indication must be corrected. Float flowmeters for liquids are usually calibrated with water, and gases with air. If the density and viscosity of the actual fluid used are different, the flow rate will deviate from the original graduation value, and conversion corrections must be made.

The correct reading method of metal rotor flowmeter is:

Stand directly in front of the flow meter with your eyes parallel to the float. Move your eyes horizontally to the left until you see the outline of the float touching the positioning line. The intersection of the positioning line and the horizontal scale in the middle of the float is the corresponding reading value.

Of course, our Sino-Inst Rotameter Flow Meters have electronic smart displays as an option. Can display instantaneous flow and accumulated flow. It can also support signal output, etc.

There are obvious differences between Rotameter Flow Meters and electromagnetic flow meters in terms of working principles, structural features and application scenarios. When choosing a suitable flow meter, we need to make a judgment based on the actual situation.

Working Principle

The metal rotor flow meter works based on the buoyancy principle. When the fluid flows through the rotor, the rotor rises or falls due to the buoyancy of the fluid. The displacement of the rotor is proportional to the flow rate of the fluid, so the flow rate of the fluid can be measured.

The electromagnetic flow meter works based on Faraday’s law of electromagnetic induction. When the fluid flows through the sensor, an induced potential proportional to the fluid flow rate is generated. The flow rate of the fluid is calculated by measuring the magnitude of the induced potential.

Structural Features

The structure of the metal rotor flow meter is relatively simple, mainly consisting of a rotor and a conduit. The rotor moves up and down in the conduit, and the buoyancy of the fluid causes the rotor to rise or fall.

The structure of the electromagnetic flow meter is relatively complex. It is mainly composed of a sensor, a measuring tube and a converter. The sensor generates a magnetic field, and when the fluid flows through the sensor, an induced potential is generated. The flow rate of the fluid is calculated by measuring the magnitude of the induced potential.

Application scenarios

Metal rotor flowmeters are suitable for measuring low conductivity liquids, such as water, milk, etc. It can be used to measure small flow rates.

Electromagnetic flowmeters are suitable for measuring conductive liquids, such as acids, alkalis, brine, etc. It has high measurement accuracy and can be used in large-scale industrial production processes. For example, in the petrochemical industry, electromagnetic flowmeters can be widely used for the measurement and monitoring of raw liquids.

Maintenance

The maintenance of metal rotor flowmeters is relatively simple. Generally, it is necessary to clean the conduit and rotor regularly and check whether the sealing is good. In some cases, the rotor or conduit may need to be replaced.

The maintenance of electromagnetic flowmeters is relatively complicated. Generally, the sensor and measuring tube need to be cleaned regularly to prevent scaling or contamination. In addition, it is necessary to check whether the magnetic field of the sensor is normal. If abnormal conditions are found, the sensor may need to be replaced or repaired.

Read more about: Rotameter vs Flow Meter

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Metal tube rotameter is a common flow measurement instrument that is widely used and can be used to measure media such as liquids, and gases. It is a flow meter with simple structure, high precision and strong reliability, so it can be used in various occasions.

For example, in high-temperature, high-pressure and corrosive media environments, high-temperature and corrosion-resistant materials can be used to manufacture metal tube rotor flowmeters to ensure long-term stable operation.

The metal tube rotameter produced and supplied by our Sino-Inst is simple to install and easy to operate. It does not require complicated maintenance and upkeep, reducing operation and maintenance costs and improving work efficiency. Moreover, it can also cooperate with various control systems to realize automatic control and improve the degree of automation of production.

If you need to purchase Rotameter Flow Meters-Metal Variable Area Flow Meters, or have related technical questions, please feel free to contact us.

Rotameter Flow meters ( Variable Area ) | Sino-Inst

Product SKU: Rotameter Flow Meters-Metal Variable Area Flow Meters

Product Brand: Sino-Inst

Product Currency: USD

Product Price: 299

Price Valid Until: 2029-09-09

Product In-Stock: InStock

Editor's Rating:
5