What Makes TF1100-MI Multi-channel Insertion Ultrasonic Flowmeter a Reliable Solution for Large-diameter Pipeline Flow Measurement?
For large‑diameter water pipelines, conventional meters suffer from signal loss, high cost, pressure loss and shutdown downtime. The TF1100‑MI multi‑channel insertion ultrasonic flowmeter supports hot‑tapped installation without pipeline shutdown or pressure drop, delivering ±0.5% reading accuracy via dual or four independent measuring channels. This guide covers its principle, features, installation, maintenance, comparison and FAQs.
1. How Does TF1100-MI Work?
TF1100‑MI adopts the ultrasonic transit‑time difference principle. The complete set includes a wall‑mounted transmitter, two or four pairs of hot‑tapped insertion transducers, mounting sockets, signal cables and installation accessories.
Each pair of insertion transducers is installed through the pipe wall with a hot‑tapped socket. The probe tips reach the inner surface of the pipe wall and sit directly in the flowing liquid, without protruding into the main flow path. The two transducers of one pair work alternately as transmitter and receiver. The ultrasonic wave travelling downstream is accelerated by the flow, while the wave travelling upstream is delayed; the extremely small time difference between the two directions is proportional to the average flow velocity along that measuring path.
The velocity distribution inside a large pipe is never uniform, so a single measuring path may be affected by swirl, asymmetric flow profiles and upstream disturbances. Equipped with two or four independent channels, TF1100‑MI averages readings from several measuring paths arranged at different positions. In this way, the final flow rate reflects the real bulk flow inside the pipe, with reading repeatability better than 0.15%.
The transmitter carries out signal amplification, digital filtering and cross‑correlation calculation, and outputs real‑time flow velocity, instantaneous flow rate, as well as forward and reverse totalized volume. Measurement results and daily, monthly and yearly records can be stored locally for up to 10 years. Historical data can be checked on site or uploaded remotely via RS485 Modbus‑RTU, pulse, NB‑IoT or 4G.
2. What Core Characteristics Does TF1100-MI Possess?
Compared with clamp‑on and full‑bore flowmeters, TF1100‑MI shows clear advantages in permanent metering of large‑diameter pipelines.
Important limitations: The pipe diameter should be DN100 to DN2000, and hot‑tapped installation requires professional drilling equipment and trained technicians. The liquid must be acoustically conductive; liquids with extremely high suspended solid concentration or heavy internal scaling will weaken the signal. Sufficient straight pipe sections are still required, and the meter is intended for permanent installation rather than casual spot checking.
3. What Are the Standard Installation and Environmental Requirements?
Piping Requirements
Correct mechanical installation and channel arrangement directly determine the accuracy and long‑term stability of TF1100‑MI. Reserve adequate straight pipe sections: 10×DN upstream, 5×DN downstream. Do not place the measuring section immediately after elbows, pumps, valves, reducers or tees. The pipe must run full of liquid; skip high points prone to gas accumulation. Both horizontal runs and vertical upward‑flow pipelines are suitable.
Transducer & Cabling Rules
Position mounting sockets strictly following the spacing calculated inside the transmitter based on pipe diameter, wall thickness and transducer layout. Complete hot‑tapping under pressure using special drilling tools and verify socket sealing after probe insertion.
Arrange multi‑channel probes on separate planes, such as cross layout or 90° offset, to offset swirl and skewed velocity profiles. Route signal cables clear of heavy electromagnetic interference and ensure reliable shielding grounding. Before formal operation, validate signal strength, signal quality and zero‑point stability after commissioning.
Temperature & Hardware Specifications
Ambient temperature range: ‑20℃ to +60℃. Medium temperature: standard sensor ‑35℃ to +85℃ (short‑term peak up to 120℃); high‑temperature variant ‑35℃ to +150℃. The transmitter shall be wall‑mounted in a protected location. The IP68 insertion sensors adapt to buried or intermittently submerged pipelines. Standard cable length is 10 m; custom lengths up to 300 m are available.
4. How to Maintain TF1100-MI for Long-Term Reliable Operation?
TF1100‑MI contains no wetted moving parts. Even so, since its probes stay in direct contact with the process liquid, periodic inspection remains essential to sustain stable long‑term measurement performance.
Routine Inspection Items
Check the transmitter housing for cracks and water penetration; verify battery status; examine signal cables and connectors for abrasion and loose terminals; watch for leakage at hot‑tapped sockets. For battery‑powered configurations, log battery voltage routinely and arrange replacement before depletion.
Periodic Performance Verification
Plan verification every 12 to 24 months. You may cross‑check readings against a portable clamp‑on ultrasonic flowmeter or send it for third‑party laboratory calibration. When a scheduled pipeline shutdown is available, retract the probes to remove scaling and sediment buildup.
Important Service Notice
Do not disassemble the transmitter or transducers on your own. Unauthorized opening voids calibration validity and the product warranty. Remember to export saved historical data on a regular basis for backup and engineering review.
5. How Does TF1100-MI Compare With Clamp-on Ultrasonic Flowmeter TF1100-EC?
Both meters work on the transit‑time ultrasonic principle, yet each fits a distinct set of site and project requirements.
6. Where Is TF1100-MI Widely Applied?
Thanks to its reliable multi‑channel insertion measurement, TF1100‑MI is well suited for permanent flow monitoring on large pipelines across a wide range of industries.
District metered areas (DMA)
Raw water intakes & pumping stations
Wastewater plant inlet & outlet
Power plant circulating cooling water
Steel & petrochemical process water
Hydropower penstocks
Irrigation & diversion pipelines
Heating network mains
Industrial effluent discharge lines
It also works perfectly to replace outdated mechanical meters and check measurement drift of existing inline electromagnetic or mechanical flowmeters, since the insertion probes can be fitted without removing the original meter. Archived flow data can be exported to support water balance analysis, non‑revenue water assessment and energy consumption evaluation.
FAQ
What pipe diameter range does TF1100‑MI cover?
DN100 to DN2000. For pipes smaller than DN100, a clamp‑on model such as TF1100‑EC is recommended.
Must the pipeline be shut down during installation?
No. The sockets are hot‑tapped and drilled under pressure, so the line keeps running and production is not interrupted.
What accuracy can TF1100‑MI achieve?
±0.5% of reading, with repeatability better than 0.15% and resolution 0.25 mm/s.
Why are two or four channels necessary on large pipes?
The velocity profile in a large pipe is not uniform. Multi‑channel measurement averages several paths at different positions, which compensates swirl and asymmetric profiles and greatly improves accuracy and stability.
Can TF1100‑MI measure dirty water?
It suits both clean and somewhat dirty liquids with turbidity below 10000 ppm. For high‑concentration slurry or liquids with heavy suspended solids, a Doppler model such as DF6100‑EP is more suitable.
How is TF1100‑MI powered?
The standard version uses a DC3.6V disposable lithium battery pack, providing more than 10 years of operation at a 500 ms measuring cycle. Please confirm with our team if a specific power supply arrangement is required for your project.
What output and communication options are available?
Pulse output and RS485 Modbus‑RTU are supported, while NB‑IoT, GPRS are optional for remote monitoring.
Is OEM / private‑label service supported?
Yes. Lanry Instruments provides full private‑label customization, including custom front‑panel logo, startup screen, branded user manual and packaging for global distributors.
How accurate is it, and does it need field calibration?
Velocity accuracy is ±1% of reading over 0.02 mm/s – 12 m/s. The meter ships factory‑calibrated; on site you mainly enter the real channel shape and invert offset. A simple comparison run under known flow is enough verification.
Large‑diameter pipeline flow metering — get your TF1100‑MI proposal
Share your pipe diameter, flow velocity range, liquid turbidity, installation constraints and communication requirements. Our engineering team will configure the proper TF1100‑MI multi‑channel insertion ultrasonic flowmeter for your project.
Hello, I am Arina Hu, Sales Engineer of Lanry Instruments. Graduating with a Bachelor's in Business English, I bring over five years of sales experience within the instrumentation sector. Having participated in multiple overseas exhibitions, I possess in‑depth product knowledge of our complete instrument lineup and strong capabilities for international client engagement. Should you have any project demands for instruments, feel free to contact me. Feel free to contact my WhatsApp.
Post time: Nov-10-2026
