UFMC Type:Clamp Ultrasonic Flow Meter

UFMC Type:Clamp Ultrasonic Flow Meter

 

    • Flow range:0.1~±6m/s
    • Accuracy: ±5%FS
    • Repeatability:0.3%
    • Piping size:DN15~DN300
    • Measuring medium: water
    • Pipe material:UPVC/Carbon Steel/SUS
    • Protection Rate:IP67

    Clamp Ultrasonic flow meter

     
    Jump to navigationJump to search
     
    Schematic view of a flow sensor.

    An clamp ultrasonic flow meter is a type of flow meter that measures the velocity of a fluid with ultrasound to calculate volume flow. Using ultrasonic transducers, the flow meter can measure the average velocity along the path of an emitted beam of ultrasound, by averaging the difference in measured transit time between the pulses of ultrasound propagating into and against the direction of the flow or by measuring the frequency shift from the Doppler effect. Ultrasonic flow meters are affected by the acoustic properties of the fluid and can be impacted by temperature, density, viscosity and suspended particulates depending on the exact flow meter. They vary greatly in purchase price but are often inexpensive to use and maintain because they do not use moving parts, unlike mechanical flow meters.

     

    Means of operation

    There are three different types of ultrasonic flow meters. Transmission (or contrapropagating transit-time) flow meters can be distinguished into in-line (intrusive, wetted) and clamp-on (non-intrusive) varieties. Ultrasonic flow meters that use the Doppler shift are called reflection or Doppler flow meters. The third type is the open-channel flow meter.[1]

    Principle

    Time transit flow meter

    Ultrasonic flow meters measure the difference between the transit time of ultrasonic pulses propagating with and against the flow direction. This time difference is a measure for the average velocity of the fluid along the path of the ultrasonic beam. By using the absolute transit times  and , both the averaged fluid velocity  and the speed of sound  can be calculated. Using these two transit times, the distance between receiving and transmitting transducers  and the inclination angle , if we assume that sound has to go against the flow when going up and along the flow when returning down, then one can write the following equations from the definition of velocity:

     and 

    By adding and subtracting the above equations we get,

     and 

    where  is the average velocity of the fluid along the sound path and  is the speed of sound.

    Doppler shift flow meters

    Another method in ultrasonic flow metering is the use of the Doppler shift that results from the reflection of an ultrasonic beam off sonically reflective materials, such as solid particles or entrained air bubbles in a flowing fluid, or the turbulence of the fluid itself, if the liquid is clean.

    Doppler flowmeters are used for slurries, liquids with bubbles, gases with sound-reflecting particles.

    This type of flow meter can also be used to measure the rate of blood flow, by passing an ultrasonic beam through the tissues, bouncing it off a reflective plate, then reversing the direction of the beam and repeating the measurement, the volume of blood flow can be estimated. The frequency of the transmitted beam is affected by the movement of blood in the vessel and by comparing the frequency of the upstream beam versus downstream the flow of blood through the vessel can be measured. The difference between the two frequencies is a measure of true volume flow. A wide-beam sensor can also be used to measure flow independent of the cross-sectional area of the blood vessel.

    Open channel flow meters

    In this case, the ultrasonic element is actually measuring the height of the water in the open channel; based on the geometry of the channel, the flow can be determined from the height. The ultrasonic sensor usually also has a temperature sensor with it because the speed of sound in air is affected by the temperature.

     

    Application Cautions for Clamp Ultrasonic Flowmeters


    For transit time clamp ultrasonic flowmeters

    Be sure that the fluid can adequately conduct ultrasonic waves, because the flowmeter will not measure when the ultrasonic waves cannot penetrate the flow stream between the transducers. Similarly, ultrasonic waves must be able to penetrate the fluid for Doppler flowmeters to operate accurately. When the fluid is relatively opaque and does not penetrate the fluid, Doppler flowmeters tend to measure the velocity of the fluid at or near the pipe wall, which can cause significant measurement error and/or cause the flowmeter to fail.

    For Doppler clamp ultrasonic flowmeters

    Be sure that the fluid adequately reflects ultrasonic waves, because the flowmeter will not operate without a reflected ultrasonic signal. Depending upon design, reflections can occur due to small bubbles of gas in the flow stream or the presence of eddies in the flow stream. If not already present in the flowing stream, generating these sources of reflection can be difficult in practice. Fortunately, some combination of bubbles of gas and/or eddies are present in most applications.

    The velocity of the solid particles in slurry can be different than its liquid carrier fluid. Be careful applying ultrasonic technology when the solid particles can become concentrated in one part of the flowing stream, such as in a horizontal pipe flowing at a relatively low velocity. Be careful when applying Doppler ultrasonic flowmeters in slurry applications because the solid particles can produce strong signals that can cause the Doppler flowmeter to measure the velocity of the solids and not the velocity of the liquid.

    Avoid fluids that can coat wetted transducers or coat the pipe wall in front of non-wetted transducers because the flowmeter will not measure when the ultrasonic waves cannot enter the flow stream. Be sure to maintain reliable clamp-on transducer connections to the pipe wall because the flowmeter will not measure when the ultrasonic waves are not able to reach the fluid.

    Be sure to understand the process and apply these flowmeters properly. For example, a periodic cleaning process upstream may cause the flowmeter to stop working because the dirt may not allow ultrasonic energy to pass through the fluid. Further, if the dirt coats wetted transducers, the flowmeter may fail to operate until it is cleaned.

    How to Use Clamp Ultrasonic Flowmeters

    Clamp Ultrasonic flowmeters are commonly applied to measure the velocity of liquids that allow ultrasonic waves to pass, such as water, molten sulfur, cryogenic liquids, and chemicals. Transit time designs are also available to measure gas and vapor flow. Be careful because fluids that do not pass ultrasonic energy, such as many types of slurry, limit the penetration of ultrasonic waves into the fluid. In Doppler ultrasonic flowmeters, opaque fluids can limit ultrasonic wave penetration too near the pipe wall, which can degrade accuracy and/or cause the flowmeter to fail to measure. Transit time ultrasonic flowmeters can fail to operate when an opaque fluid weakens the ultrasonic wave to such an extent that the wave does not reach the receiver.

    Industries Where Used

    The industries in order of higher to lower are oil and gas, water and wastewater, power, chemical, food and beverage, pharmaceutical, metals and mining, and pulp and paper.

  • Model

    UFMC

    UFMV

    Flow Range(m/s)

    0~6

    0~6

    Accuracy

    ±1.5 % FS

    Repeatability

    ±0.3 % FS

    Measuring medium

    Water

    Working temperature

    -10℃~+50℃

    Piping size

    DN15~DN50

    DN65-DN300

    Piping material

    UPVC/carbon steel/Stainless steel

    Install way

    Clip

    V-Rail

    Flow rate output signals

    4~20mA or RS485 or Wireless(Zigbee 2.4G)

    required power supply

    DC24V/1A





  • Application Cautions for Clamp Ultrasonic Flowmeters


    For transit time clamp ultrasonic flowmeters

    Be sure that the fluid can adequately conduct ultrasonic waves, because the flowmeter will not measure when the ultrasonic waves cannot penetrate the flow stream between the transducers. Similarly, ultrasonic waves must be able to penetrate the fluid for Doppler flowmeters to operate accurately. When the fluid is relatively opaque and does not penetrate the fluid, Doppler flowmeters tend to measure the velocity of the fluid at or near the pipe wall, which can cause significant measurement error and/or cause the flowmeter to fail.

    For Doppler clamp ultrasonic flowmeters

    Be sure that the fluid adequately reflects ultrasonic waves, because the flowmeter will not operate without a reflected ultrasonic signal. Depending upon design, reflections can occur due to small bubbles of gas in the flow stream or the presence of eddies in the flow stream. If not already present in the flowing stream, generating these sources of reflection can be difficult in practice. Fortunately, some combination of bubbles of gas and/or eddies are present in most applications.

    The velocity of the solid particles in slurry can be different than its liquid carrier fluid. Be careful applying ultrasonic technology when the solid particles can become concentrated in one part of the flowing stream, such as in a horizontal pipe flowing at a relatively low velocity. Be careful when applying Doppler ultrasonic flowmeters in slurry applications because the solid particles can produce strong signals that can cause the Doppler flowmeter to measure the velocity of the solids and not the velocity of the liquid.

    Avoid fluids that can coat wetted transducers or coat the pipe wall in front of non-wetted transducers because the flowmeter will not measure when the ultrasonic waves cannot enter the flow stream. Be sure to maintain reliable clamp-on transducer connections to the pipe wall because the flowmeter will not measure when the ultrasonic waves are not able to reach the fluid.

    Be sure to understand the process and apply these flowmeters properly. For example, a periodic cleaning process upstream may cause the flowmeter to stop working because the dirt may not allow ultrasonic energy to pass through the fluid. Further, if the dirt coats wetted transducers, the flowmeter may fail to operate until it is cleaned.

    How to Use Clamp Ultrasonic Flowmeters

    Clamp Ultrasonic flowmeters are commonly applied to measure the velocity of liquids that allow ultrasonic waves to pass, such as water, molten sulfur, cryogenic liquids, and chemicals. Transit time designs are also available to measure gas and vapor flow. Be careful because fluids that do not pass ultrasonic energy, such as many types of slurry, limit the penetration of ultrasonic waves into the fluid. In Doppler ultrasonic flowmeters, opaque fluids can limit ultrasonic wave penetration too near the pipe wall, which can degrade accuracy and/or cause the flowmeter to fail to measure. Transit time ultrasonic flowmeters can fail to operate when an opaque fluid weakens the ultrasonic wave to such an extent that the wave does not reach the receiver.

    Industries Where Used

    The industries in order of higher to lower are oil and gas, water and wastewater, power, chemical, food and beverage, pharmaceutical, metals and mining, and pulp and paper.

  • Model

    UFMC

    UFMV

    Flow Range(m/s)

    0~6

    0~6

    Accuracy

    ±1.5 % FS

    Repeatability

    ±0.3 % FS

    Measuring medium

    Water

    Working temperature

    -10℃~+50℃

    Piping size

    DN15~DN50

    DN65-DN300

    Piping material

    UPVC/carbon steel/Stainless steel

    Install way

    Clip

    V-Rail

    Flow rate output signals

    4~20mA or RS485 or Wireless(Zigbee 2.4G)

    required power supply

    DC24V/1A

  • Order Information

             

    UFM

    Code

    Installing Type

     

    C

    Clamp(For DN15~DN65 only)

     

    V

    V-rail(For DN65~DN300 only)

     

     

    Code

    Out Signal

     

     

    1

    4~20mA

     

     

    2

    RS485

     

     

    3

    Wifi(Zigbee 2.4G)

     

     

     

    Code

    Piping Size Type

     

     

     

    0

    DN15(For Clamp type only)

     

     

     

    1

    DN20(For Clamp type only)

     

     

     

    2

    DN25(For Clamp type only)

     

     

     

    3

    DN32(For Clamp type only)

     

     

     

    4

    DN40(For Clamp type only)

     

     

     

    5

    DN50(For Clamp type only)

     

     

     

    6

    DN65(For V-rain type only)

     

     

     

    7

    DN80(For V-rain type only)

     

     

     

    8

    DN100(For V-rain type only)

     

     

     

    9

    DN150(For V-rain type only)

     

     

     

    10

    DN200(For V-rain type only)

     

     

     

    11

    DN250(For V-rain type only)

     

     

     

    12

    DN300(For V-rain type only)

     

     

     

     

    Code

    Logo

     

     

     

     

    F

    FGT Logo(Standard Type)

     

     

     

     

    C

    Customer Logo

     

     

     

     

     

     

     

    UFM

     

     

     

     

    Complete Ordering Code

    *Note:All Model come with Power Supply(+24Vdc/1A)

       

    *Note:Using customer Logo launch to more than 100 united for  one year