FlowT FT201 RS485 Ultrasonic Flow Meter
The FlowT FT201 Ultrasonic Flow Meter is a wall-mounted liquid flow measurement solution designed for water, HVAC, utility and industrial monitoring projects. With external clamp-on transducers, RS485 Modbus communication and IP68-protected sensors, the FT201 helps project buyers add reliable flow measurement to existing pipelines while reducing unnecessary pipe modification.With ±1% measurement accuracy, 25–1200 mm standard pipe coverage, 4–20 mA output and RS485 Modbus communication, the FT201 provides a practical balance of measurement performance, industrial connectivity and project cost.
Key Advantages
±1% Measurement Accuracy for reliable industrial flow monitoring
RS485 Modbus Communication for PLC, SCADA and BMS integration
IP68 Clamp-On Transducers for demanding field installations
25–1200 mm Pipe Size Range for a wide range of water applications
Non-Intrusive Measurement without installing a meter body inside the pipe
4–20 mA + Pulse Output for flexible industrial system integration
The FlowT FT201 is designed for buyers who need reliable liquid flow measurement without the installation complexity of a conventional inline meter.
Using ultrasonic transit-time measurement and external clamp-on transducers, the FT201 measures flow from outside the pipeline. This allows the measuring sensors to be installed without placing a mechanical measuring body directly into the liquid stream.
For retrofit projects, water systems, HVAC installations and industrial utility pipelines, this design can simplify installation planning while avoiding additional obstruction in the flow path.
The FT201 combines practical measurement performance with commonly required industrial interfaces, including 4–20 mA, pulse output and RS232/RS485 Modbus communication, making it suitable for standalone monitoring as well as integration into automation systems.
FlowT supports contractors, system integrators, distributors and industrial buyers with technical selection, documentation, project quotation and repeat-order supply.
Why Choose the FlowT FT201?
Reliable ±1% Flow Measurement
The FT201 provides ±1% of measured value accuracy, with 0.2% repeatability and ±1% linearity.This level of performance makes the meter suitable for general industrial flow monitoring, water measurement, HVAC systems and utility applications where stable and repeatable flow information is required.For project approval, FlowT can support technical documentation and flow verification information according to order requirements.
Non-Intrusive Clamp-On Installation
The FT201 uses external ultrasonic transducers mounted on the outside of the pipeline.Because the transducers do not need to be installed directly inside the flow stream, the system can help reduce pipeline modification during installation and is particularly useful for retrofit projects on existing pipes.There are no rotating mechanical measuring components inside the liquid flow path.
RS485 Modbus for Industrial Automation
RS485 Modbus communication allows the FT201 to exchange flow data with compatible industrial control and monitoring systems.
This makes the flow meter suitable for integration with:PLC systems/SCADA platforms/BMS systems/Industrial gateways/Remote monitoring systems/Data acquisition systems.
IP68 Transducers for Demanding Installations
The FT201 uses an IP68 encapsulated transducer design, while the transmitter is rated IP65.This clear separation of protection ratings makes it easier for engineers to design installations where sensors may be located in wet, humid or demanding field environments while the transmitter remains installed in an appropriate protected location.
Wide Pipe Coverage
The standard FT201 configuration supports pipe sizes from:25 mm to 1200 mm,Pipe sizes below 1 inch can also be discussed as an option.This broad range allows contractors and distributors to use the same product family across multiple pipe sizes, simplifying sourcing and project standardization.
Flexible Industrial Outputs
In addition to RS485 Modbus communication, the FT201 supports:4–20 mA analog output/0–10 kHz pulse output/RS232 communication/RS485 Modbus communication.These options provide practical flexibility for local monitoring, remote transmission, flow totalization and automation-system integration.
Parameters and Specifications
| Series Product Name FT Series Ultrasonic Flowmeter |
Product Model FT101 |
Fluid Single medium liquid |
| Flow Range ±0.01m/s ~ ±12m/s |
Accuracy ±0.5% of reading |
Repeatability 0.1% of measured value |
| Linearity ±0.5% |
Pipe Size 25mm ~ 5000mm |
Pulse Output 0 ~ 9999KHz, OCT |
| Analog Output 4 ~ 20mA, Max load 750Ω |
Communication RS232 & RS485 |
Power Supply 90 to 245 VAC, 48 to 63 Hz, Or 10 to 36 VDC |
| Humidity Up to 99% RH, Non-Condensing |
Temperature Transmitter: -40°F ~ 140°F Transducer: -40°F ~ 176°F 32°F ~ 356°F |
Display 240*128 back lit LCD |
Applications of the FT201 Ultrasonic Flow Meter
Water Treatment
The FT201 can be used for flow monitoring in water-treatment facilities, process-water pipelines, filtration systems and pumping stations. RS485 Modbus communication allows measurement data to be connected to centralized monitoring systems where required.
Water Distribution
For distribution pipelines, the FT201 provides external ultrasonic measurement without placing additional mechanical components inside the water flow path.Its wide pipe range makes it suitable for multiple measurement points within utility and water-distribution projects.
HVAC Chilled-Water Systems
Flow measurement is important for chilled-water system balancing, energy monitoring and building-services operation.The FT201 can provide flow information to compatible BMS systems through RS485 Modbus communication.
Industrial Cooling Water
Cooling-water flow directly affects equipment cooling and process stability.The FT201 can support continuous flow monitoring in industrial cooling-water and circulation-water pipelines.
Process Water
Industrial plants often require flow monitoring for utility water, process water and auxiliary liquid systems.The FT201 provides a practical ultrasonic measurement solution with analog and digital outputs for industrial monitoring.
Pump Performance Monitoring
Flow information can be used together with pressure and operating data to evaluate pump-system performance.The FT201 provides continuous flow measurement without introducing an additional mechanical measuring body into the pipeline.
Simple Clamp-On Installation
Step 1 - Confirm the Measurement Point
Select a full-pipe location with sufficient straight pipe and avoid locations immediately downstream of strong flow disturbances where possible.
Step 2 - Confirm Pipe Parameters
Enter or confirm the pipe diameter, wall thickness, material and liquid information required by the transmitter.
Step 3 - Prepare the Pipe Surface
Clean the transducer mounting area and remove loose paint, rust, scale or contamination that may reduce ultrasonic signal transmission.
Step 4 - Calculate Sensor Spacing
Use the FT201 transmitter settings to determine the recommended transducer installation spacing.
Step 5 - Apply Coupling Material
Apply suitable ultrasonic coupling material between the transducer surface and the pipeline to improve acoustic transmission.
Step 6 - Mount the Transducers
Secure both transducers in the required installation arrangement and maintain the calculated spacing.
Step 7 - Check Signal Quality
Confirm that the ultrasonic signal and measurement parameters are stable before completing commissioning.
Step 8 - Configure Outputs and RS485
Set the required 4–20 mA, pulse and RS485 Modbus communication parameters according to the project control system.
FAQ
Q: What is the FT201 ultrasonic flow meter?
A: The FlowT FT201 is a wall-mounted ultrasonic liquid flow meter designed primarily for water measurement. It supports external clamp-on transducers, industrial analog outputs and RS232/RS485 Modbus communication.
Q: What is the accuracy of the FT201?
A: The FT201 has a specified measurement accuracy of ±1% of measured value, with 0.2% repeatability and ±1% linearity.
Q: What pipe sizes can the FT201 measure?
A: The standard pipe-size range is 25 mm to 1200 mm. Applications below 1 inch can be discussed as an option.
Q: What is the FT201 flow velocity range?
A: The specified velocity range is ±0.03 m/s to ±5 m/s.
Q: Does the FT201 support RS485?
A: Yes. The FT201 supports RS232 / RS485 Modbus communication.
Q: Can the FT201 connect to a PLC or SCADA system?
A: Yes, RS485 Modbus can be used for integration with compatible PLC, SCADA, BMS or industrial monitoring systems. The communication configuration should be confirmed before commissioning.
Q: Does the FT201 have a 4–20 mA output?
A: Yes. The FT201 provides a 4–20 mA analog output with a maximum load of 750 Ω.
Q: Does it support pulse output?
A: Yes. The FT201 supports a 0–10 kHz pulse output.
Q: Is the FT201 IP68?
A: The transducers are IP68, while the transmitter is IP65. These ratings should be considered separately when planning the installation.
Q: Does installation require cutting the pipe?
A: The standard clamp-on transducers are installed on the outside of the pipe, so the transducer installation itself does not require an inline meter body to be installed in the pipeline.
Q: What liquids can the FT201 measure?
A: The standard product is specified for water. Other compatible liquids can be evaluated according to acoustic properties, pipe conditions and project requirements.
Q: Can it measure hot liquids?
A: The standard FT201 transducer is suitable for a defined temperature range, and higher-temperature transducer options can be discussed according to the project.
Q: Can I request a sample?
A: Yes. Contact FlowT with your pipe and application information so the appropriate FT201 configuration can be confirmed before sample evaluation.
Q: Does FlowT support OEM/ODM?
A: Yes, OEM/ODM requirements can be discussed for distributor and project orders. Please provide the required quantity, branding, packaging and technical customization requirements.
Q: What is the MOQ?
A: MOQ depends on the order configuration and customization requirements. Contact FlowT for sample, standard-order or OEM project details.
Q: What is the lead time?
A: Lead time depends on quantity, product configuration, customization and stock status. Include your target delivery date when requesting a quotation.
Q: Can FlowT provide technical documents?
A: Yes. Buyers can request the FT201 datasheet, installation information, RS485/Modbus documentation, wiring information and relevant test documentation.
Q: Does FlowT provide a warranty?
A: FlowT currently provides a 12-month warranty for flow meter products.
Need an FT201 for Your Flow Measurement Project?
Send FlowT your pipe diameter, pipe material, liquid, operating temperature, expected flow range and RS485 communication requirements.
Our team can help confirm the appropriate FT201 configuration before quotation and provide the technical information required for project evaluation.For faster commercial evaluation, also include your quantity, destination country and required delivery date.
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