Rotameter Flow Meters-Metal Variable Area Flow Meters

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Rotameter Flow Meters-Metal Variable Area Flow Meters

Metal Rotameter Flow Meters are a type of variable area flow measurement instrument commonly used in industrial automation process control. It has the characteristics of small size, large detection range and easy use. It can be used to measure the flow of liquids, gases and steam. It is especially suitable for medium flow measurement with 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, HART protocol. Two alarm outputs can be configured.

RFQ DP Flow Meters

Features

  • Small size, large detection range, easy to use;
  • It adopts 16-bit microprocessor industrial components to ensure excellent performance;
  • Different measurement methods can be selected according to different requirements of customers;
  • Intelligent flow meter indicator with independent intellectual property rights;
  • Suitable for small diameter and low flow rate medium flow measurement;
  • Reliable work, low maintenance and long life;
  • The requirements for straight pipe sections are not high, and the wider flow ratio is 10:1;
  • Double-line large LCD indicator can display instantaneous flow and accumulated flow at the same time, and can be equipped with backlight;
  • Single-axis sensitive indication, non-contact magnetic coupling transmission;
  • All-metal structure, suitable for high temperature, high pressure and strong corrosive media;
  • Can be used in flammable and explosive hazardous locations;
  • Optional two-wire system, battery, AC and DC power supply;
  • Multi-parameter calibration function;
  • With data recovery, data backup and power-off protection functions;

Rotameter Flow Meters Technical Parameters

Measuring rangeWater (20℃): 1-200000 L/h Air (20℃, 0.1013MPa): 0.03~4000m³/h
TurndownStandard type 10:1, special type 20:1
AccuracyGas 2.5%FS;
Liquid 1.5%F.S
Pressure LevelStandard 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 loss2kpa-20kpa
Medium temperatureStandard type: -40℃~100℃; PTFE: 0℃~120℃;
High temperature type: 100℃~450℃;
Medium viscosityDN15: η<5mPa.s(F15.1-F15.3) η<30mPa.s (F15.4-F15.8)
DN25: η<30mPa.s DN50-DN150: η<30mPa.s 
ambient temperatureRemote 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 TypeConnection 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 interfaceThe flameproof type is 1/2NPT internal thread; other M20*1.5 internal thread;
Power supplyStandard 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 characteristicsTwo-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 OutputUpper or lower limit instantaneous flow alarm;
Switch quantity alarm;
Relay output;
LCDInstantaneous flow rate display value range: 0-50000 (with decimal point)
Accumulated flow display value range: 0-99999999 (with decimal point) automatic reset
Protection levelIP65
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Flow Range

Water(L/h)   Air
Nomirnal DiameterRotator No
  Material RO.R1,R2,TI,RL		Materlal PTFE
Nm³/h(under standard state)
DN15F15.0
F15.1
F15.2
F15.3
F15.4
F15.5
F15.6
F15.7
F15.8
F15.9
F25.0		  1～10
  6～16
  2.5～25
  4.0～40
  6.3～63
  10～100
  16～160
  25～250
  40～400
  63～630
  63～630		1.6～16
2.5～25
4.0～40
6.0～60
10～100
16～160
25～250
40～400		    0.03～0.3
   0.05～0.5
   0.07～0.7
   0.11～1.1
   0.18～1.8
   0.28～2.8
   04～4
   0.7～7
   1.0～10
   1.6～16
   3.0～30
DN25F25.1
F25.2
F25.3
F5		100～1000
160～1600
200~2000
250～2500
320～3200		63～630
100～1000

160～160		    3.0～3
   4.5～45

   7.0～7
DN50F25.6
F25.7
F25.8
F50.0
F50.1
F50.2
F50.3
F50.4
F50.5
F80.0
F80.1		  400～4000
  500~5000
  630～6300
  500～5000
  630～6300
  1000～10000
  1600～16000
  2000～20000
  2500～25000
  1600～16000
  2000～20000		200～2000
250～2500
320～3200

400～4000
630～6300
1000～10000
1600～16000		 12～120

 18～180

 18～180
 25～250
 40～400

 63～630
DN80 F80.2
F80.3
F80.4
F100.0		2500～25000
4000～40000
6300～63000
4000～40000		1600～16000
2500～2500
4000～4000		    70～700
   120～1200
   180～1800
DN100 F100.1
F100.2
F100.3
F150.0		6300～630000
8000～80000
1000～10000
8000～80000		4000～40000
6000～60000
8000～80000		      180～1800

   300～3000
DN150F150.1
F150.2
F200.0		10000～100000
15000～150000
15000～150000		8000～80000 300～3000

DN200
 F200.1
20000～200000		It can be DN20,DN32,DN40,DN65,DN125  for special.
Please contact and consultant with the manutadurer

Structure of rotameter flow meter

This series of metal tube rotameter flow meter 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.

Structure of rotameter flow meter 1

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.

Structure of rotameter flow meter 2

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.

rotameter flow meter working principle

Advantages:

  1. 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.
  2. The float flowmeter has a wide flow range, generally 10:1. Pressure loss is low.
  3. 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.
  4. 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:

  1. 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.
  2. 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.

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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, gases, and steam. 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.

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    Rotameter Flow meters | Manufacturer Supply-Best Price

    Metal Rotameter Flow Meters are a type of variable area flow measurement instrument commonly used in industrial automation process control. It has the characteristics of small size, large detection range and easy use. It can be used to measure the flow of liquids, gases and steam. It is especially suitable for medium flow measurement with low flow rate and small flow rate.

    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