Ultrasonic Flowmeter – Clamp On Previous ProductNext Product

Best-in-class performance and day-to-day operation

World’s First Flow-Liquid System

Monitoring your processes with accurate clamp-on ultrasonic flow measurement leads to higher transparency, improved productivity – and a better bottom line. To optimize every operation, we offer a comprehensive selection of clamp-on flow sensors, transmitters and complete flow systems.


Clamp-on ultrasonic flowmeters showcase the benefits of digital signal processing: market-leading accuracy, noise immunity and reliability.

High speed update rate ensures superior user-friendliness at every stage of installation and operation. With no pressure drop or energy loss, a wide turndown ratio and non-intrusive sensors that can be installed without cutting into the pipe, makes these sensors the ideal solution for liquid flow measurement. The flow system consists of a transmitter paired with clamp-on ultrasonic sensors, which are available in three different versions: WideBeam® (High-Precision), Universal and High-Temperature. The sensors feature low maintenance and high precision – even for applications with high levels of aeration or suspended solids.



Power engineering

Water and wastewater

Chemical Industry


Transducers can be replaced under pressure

No pressure drop

High accuracy and repeatability – accuracy of 1% of flow rate and repeatability of 0.25% according to ISO 11631

Exceptional zero stability – minimal need to set a zero point

Best-in-class user-friendliness – fully graphical display with simple menu navigation, multiple setup wizards and the option to display up to 6 customizable parameters on the same screen

Easy servicing – includes removable SensorFlash® microSD card and built-in USB service port


Range ±12 m/s (±40 ft/s), bidirectional
Flow Sensitivity 0.001 m/s (0.003 ft/s) flow rate independent
Pipe Size range 12.7 mm to 10 m (0.5" to 394")
Working Temperature -10 ... +50 °C (14 ... 122 °F)
Storage Temperature -20 ... +60 °C (-4 ... +140 °F)
Material (pipe) Steel EN 1.0345-P235GH
Material (transducer) Stainless steel AISI 316 or similar
Accuracy 1% for velocities ≥ 0.3 m/s (1 ft/s)
Repeatability ± 0.25 % (according to ISO 11631)
Channels Single Channel
Input 2x digital inputs for totalizer start/stop and reset
Output 1x 4 -20 mA, 1x relay, 1x pulse/frequency
Output (transducer) 4 – 20 mA
Display 240 x 160, fully graphical
Display units All standard engineering units in m3, litre, gallon, ft3, imperial gallon
Communication Modbus RTU, compatible with SIMATIC PDM
Power Supply 100 ... 240 V AC @ 20 VA or
11.5 ... 28.5 V DC @ 10 W
Dimensions (W x H x D) 176 x 240 x 87 mm
(6.9 x 9.5 x 3.4 inch)
Enclosure Material Polycarbonate
Protection Class IP65 (NEMA 4)


SITRANS FST020 Transmitter
SITRANS FSS 200 Clamp-on ultrasonic sensors


External Controller

Product Code: AN-EXT-CNTLR


Product Code: AN-COMM
Cloud Data Logger Interface • Connection via SIM, LAN
• Secured tamper proof data transfer