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.
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
RBFM Hot-tapped Insertion Transit-Time Ultrasonic Flow meter Features:
RBFM-F-I Insertion Type Ultrasonic Flow Meter
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Transmitter |
Power Supply |
Standard: 115/230VAC 50/60Hz ±15%, 5VA max. Optional: 10 - 28 VDC, 2.5VA max. Solar supply 12VDC |
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Velocity |
0~ ±40 ft/s (0 ~ ±12m/s), bi-directional |
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Display |
2 line×20 English letters LCD back lit, can display total flow, flow rate, velocity and meter running status etc. |
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Units Rate Totalized |
User Configured (English and Metric); Rate and Velocity Display; (FWD, NET, REV or BATCH) gallons, ft³, barrels, lbs, liters, m³,kg |
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Output |
4~20mA, OCT Pulse, Relay, RS232C or RS485, Optional: up to 8 GB Data logger, Modbus |
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Accuracy |
±1.0% of reading at rates >0.5 m/s |
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±2.0% of reading at rates <0.5 m/s |
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Sensitivity |
Flow Rate: 0.001ft/s (0.0003m/s) |
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Repeatability |
0.2% of reading |
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Security |
Keypad lockout, access code enable |
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Dimensions and Weight |
Std.:185*135*85mm Weight: <2.5kg, IP66 |
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Transducer |
Liquid Types Supported |
Virtually most any liquid containing less than 2% total suspended solids (TSS) or aeration |
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Pipe Range |
DN80-6000 |
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Suited Liquid Temperature |
Std. Temp. Transducer: -40℃~160℃ |
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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. |
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Dimensions |
B type: Std.: A=170mm; Std. C type: A=220mm; Extended: A=310mm; |
RBFM Ultrasonic Flowmeter 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 | ||||||||||||
| BC | Fixed and Compact type | |||||||||||
| BR | fixed and Remote type | |||||||||||
| H | Handheld type | |||||||||||
| P | Portable 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 RBFMH/P(pipe size: 15-100mm, temp.: -40 to 90℃) | |||||||||||
| SPMH | S type with mounting frame only for RBFMH/P(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 RBFMH/P(pipe size: 50-300mm, temp.: -40 to 90℃) | |||||||||||
| MPMH | M type with mounting frame only for RBFMH/P(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 | |||||||||||
| 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 | |||||||||||
RBFM Hot-tapped Insertion Transit-Time Ultrasonic Flow meter Applications:
Magmeters
Ultrassonic Flow Meter
Coriolis Mass Flow Meter
Other Flow Instrument