Hot-tapped Ultrasonic Flow Meter

RBFM Fixed Insertion type 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.



  • Features
  • Specification
  • Model Selection
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RBFM Fixed Insertion type Transit Time Ultrasonic Flow meter Features:

  •  Hot-tapped installation, no pipe line flow interrupted.
  • No moving parts, no pressure drop, no maintenance.
  • Insertion transducers are suitable for high temperature of -30℃~160℃.
  •  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.
  • One meter suitable for a wide range of pipe sizes from DN50 to DN6000.
  • Signal quality tracking and self-adjusting functions.
  • Available with extended insertion transducers for cement pipe line, wall thickness less than 70mm permitted.
  • Data logger optional, can memory flow rate, total flow, velocity and time.   Time interval can be freely setup by user.

RBFM Fixed Insertion(Hot-tapped) type Transit Time Ultrasonic Flow meter Specifications


Power Supply

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

Optional: 10 - 28 VDC, 2.5VA max.

Solar supply 12VDC


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


4 line×16 English letters LCD back lit, can display total flow, flow rate, velocity and meter running status etc. 




User Configured (English and Metric);

Rate and Velocity Display;

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


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

Optional: up to 8 GB Data logger, Hart +(4~20mA), Modbus


±1.0% of reading at rates >0.5 m/s

±2.0% of reading at rates <0.5 m/s


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


0.2% of reading


Keypad lockout, access code enable

Dimensions and Weight   

Std.:241×193×76.5 Weight: <2.5kg

Exp: 255×220×110 Weight: <5.0kg


Liquid Types Supported

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

Pipe Range


Suited Liquid Temperature

Std. Temp. Transducer: -40℃~121℃

High Temp. Transducer: -40℃~150℃

Cable Length

Shielded transducer cable. Standard length 20fts (6m). Can be extended to 990fts (300m). 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.


Std.: φ20mm, 190mm;  weight:<0.6kg

Extended: φ20mm, 325mm;  weight:<1.6kg

Model Selection

RBFM Fixed Insertion(Hot-tapped) type Transit Time Ultrasonic Flow meter Model Selection


RBFM Fixed Insertion(Hot-tapped) type Transit Time Ultrasonic Flow meter Applications:

  • Insertion (Hot-tapped) Ultrasonic Flow Meter is widely useing in Municipal projects

    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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