Insertion Ultrasonic Flow Meter

Insertion Hot-tapped Ultrasonic Flow Meter
  • Insertion Hot-tapped Ultrasonic Flow Meter

RBFM Hot-tapped Insertion Transit-Time Ultrasonic Flow meter provides abundant capabilities for accurate liquid flow measurement from outside of a pipe.

It utilizes state-of-the-art technologies on ultrasonic transmission /receiving, digital signal processing and transit-time measurement. The proprietary signal quality tracking and self-adapting technologies allow system to optimally adapt to different pipe materials automatically.

Due to hot-tapped mounting of insertion transducers, there is no ultrasonic compound and coupling problem; Even though the transducers are inserted into pipe wall, they do not intrude into the flow, thus, do not generate disturbance or pressure drop to the flow. The insertion (wetted) type has the advantage of long-term stability and better accuracy.

 

 

Description

  • Principle
  • Features
  • Specification
  • Model Selection
  • Applicants
  • Download
Principle

RBFM InsertionType Ultrasonic (Transit-time) flow meter utilizes two transducers that function as both ultrasonic transmitters and receivers. The transducers are clamped on the outside of a closed pipe at a specific distance from each other. 

Insertion Type transducers can be mounted in Z-method in which case the transducers are mounted on opposite sides of the pipe and the ultra sound transverses the pipe only once or W-method in which case the ultra sound transverses the pipe four times, or in  V-method in which case the ultra sound transverses the pipe twice, 

The selection of mounting method depends on pipe and liquid characteristics. When the flow meter works, the two transducers transmits and receives ultrasonic signals amplified by multi beam which travels firstly downstream and then upstream (Figure 1). Because  ultra sound travels faster downstream than upstream, there will be a difference of time of flight(△ｔ). When the flow is still, the time difference(△ｔ) is zero. Therefore, as long as we know the time of flight both downstream and upstream, we can work out the time difference, and then the flow velocity (V) and flow volume (Q) via the following formula. 

 V= K*D* △ｔ           

 

    

V: Liquid velocity

K: Constant

D: Distance between the two transducers

△ｔ: Difference in time of fligh

Insertion Ultrasonic Flow Meter

Features

RBFM Hot-tapped Insertion Transit-Time Ultrasonic Flow meter Features:

  • Hot-tapped installation, no pipe line flow interrupted.
  • nsertion transducers are suitable for high temperature of -40℃~160℃.
  • Wide bi-directional Flow range of 0 to 40 ft/s (0 to 12 m/s), totalizer for net, positive and negative flow display.One meter suitable for a wide range of pipe sizes from DN80 to DN6000.
  • Internally configured batch controller makes batch control convenient  and accurate.
  • Spool-piece transducer for best accuracy (better than ±1.0% read) and better long-term stability.
  • No moving parts, no pressure drop, no maintenance.
  • Signal quality tracking and self-adjusting functions.
  • Available with extended insertion transducers for cement pipe line, wall thickness less than 100mm permitted.
  • Up to 64GB SD card data logger optional, can memory flow rate, total flow, velocity and time.   Time interval can be freely setup by user.
Specification

RBFM-F-I Insertion Type Ultrasonic Flow Meter

Transmitter

Power Supply

Standard: 115/230VAC 50/60Hz ±15%, 5VA max.

Optional: 10 - 28 VDC, 2.5VA max.

Solar supply 12VDC

Velocity

0~ ±40 ft/s (0 ~ ±12m/s), bi-directional

Display

2 line×20 English letters LCD back lit, can display total flow, flow rate, velocity and meter running status etc. 

Units

Rate

Totalized

User Configured (English and Metric);

Rate and Velocity Display;

(FWD, NET, REV or BATCH) gallons, ft³, barrels, lbs, liters, m³,kg

Output

4~20mA, OCT Pulse, Relay, RS232C or RS485,

Optional: up to 8 GB Data logger, Modbus

Accuracy

±1.0% of reading at rates >0.5 m/s

±2.0% of reading at rates <0.5 m/s

Sensitivity

Flow Rate: 0.001ft/s (0.0003m/s)

Repeatability

0.2% of reading

Security

Keypad lockout, access code enable

Dimensions and Weight   

Std.:185*135*85mm Weight: <2.5kg, IP66

 

Transducer

Liquid Types Supported

Virtually most any liquid containing less than 2% total suspended solids (TSS) or aeration

Pipe Range

DN80-6000

Suited Liquid Temperature

Std. Temp. Transducer: -40℃~160℃

Cable Length

Shielded transducer cable. Standard length 6m (20fts). Can be extended to 300m (990fts). Contact the manufacturer for longer cable requirement. Cable should not be laid in parallel with high-voltage power line; neither should it be close to strong interference source such as power transformers.

Dimensions

B type: Std.:  A=170mm;  Std. C type: A=220mm;

Extended: A=310mm;  
Model Selection

RBFM Ultrasonic Flow/Heat Meter Model Selection

RBFM 

X

 

X

X

DNxx

X

X

 

X

X

X

 

 

Instrument Type

 

  

F

Ultrasonic Flowmeter

H

Ultrasonic Heat meter

 

Power supply

A

220VAC

D

24VDC

B

Battery

 

Flow/Heat meter Type

  

F

Fixed type

H

Handheld type

F

Flanged type

B

Battery type

 

  

  

  

Transducer Type

  

 

SN

S type(pipe size: 15-100mm, temp.: -30 to 90℃)

SH

S type(pipe size: 15-100mm, temp.: -40 to 160℃)

SPMN

S type with mounting frame only for Handheld (pipe size: 15-100mm, temp.: -40 to 90℃)

SPMH

S type with mounting frame only for Handheld(pipe size: 15-100mm, temp.: -40 to 160℃)

MN

M Type(pipe size: 50-700mm, temp.: -30 to 90℃))

MH

M Type(pipe size: 50-700mm, temp.: -40 to 160℃))

MPMN

M type with mounting frame only for  Handheld (pipe size: 50-300mm, temp.: -40 to 90℃)

MPMH

M type with mounting frame only for Handheld (pipe size: 50-300mm, temp.: -40 to 160℃)

RB-1

extended the mounting frame, for pipe:DN300-700mm, temp.: -40 to 90℃

RBH

extended the mounting frame, for pipe:DN300-700mm, temp.: -40 to 90℃

LN

L type(pipe size: 300-6000mm, temp.: -30 to 90℃)

LH

L type(pipe size: 300-6000mm, temp.: -40 to 160℃)

I

Insertion Type

IE

Extended type

F

Flanged type

 

Pt100

Temperature sensor

  

 

DNxx

Pipe size

  

 

 

Pipe material

  

 

C

Carbon Steel

SS

Stainless Steel

CI

cast iron

F

Fibreglass

P

PVC

C

cement pipe

X

Others,  clarify

 

X

Pressure(MPa)

  

 

Output

  

N

NO

A

4-20mA

P

Pulse

R

Relay

2

RS232

4

RS485

5

Datalogger

 

Input

 

N

NO

1

1*4-20mA

2

2*4-20mA

3

3*4-20mA

 

Cable length

X

meter
Applicants

RBFM Hot-tapped Insertion Transit-Time Ultrasonic Flow meter Applications:

  • Water, including hot water, chilled water, city water, sea water etc.
  •  Secondary sewage, waste treatment, etc.
  •  Oil, including lubricating oil, diesel oil, fuel oil, etc.
  •  Beverage, food and pharmaceutical processor
  • HVAC, energy measurement system, etc.
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