Ponton Industries


Process Instrumentation

Clamp-on Ultrasonic Flow Meter

The SITRANS FS220 digital clamp-on ultrasonic flow meter provides the most essential flow measurement functionalities with superior accuracy, cost efficiency and ease of use. It is the best-in-class solution for straightforward flow monitoring of liquid processes in number of industries, including water and wastewater, HVAC, power and chemical. 

SITRANS FS220 Catalog 


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The SITRANS FS220 clamp-on ultrasonic flow system consists of a SITRANS FST020 transmitter paired with SITRANS FSS200 clamp-on ultrasonic sensors, which are available in three different models: WideBeam® (High-Precision), Universal and High-Temperature. The FST020 transmitter has been upgraded to deliver leading reliability, user-friendliness and options for customization, while the FSS200 sensors feature low maintenance and high precision – even for applications with high levels of aeration or suspended solids.


Built on the same architecture as other next-generation digital flow systems from Siemens, the SITRANS FS220 clamp-on flow meter features among others:

  • 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

SITRANS FST020 wall-mount transmitter

ChannelsSingle channel
CommunicationModbus RTU, compatible with SIMATIC PDM
 Enclosure rating

IP65 (NEMA 4X)

 Display240 x 160, fully graphical
Power Supply

100-240 V AC 15 VA max., 11.5-28.5 V DC 7.5W max.


2x digital inputs for totalizer start/stop and reset

Outputs1x 4 -20 mA, 1x relay, 1x pulse/frequency
 Accuracy1% for velocities ≥ 0.3 m/s (1 ft/s)
Flow range ±12 m/s (±40 ft/s), bidirectional
 Pipe size range12.7 mm to 10 m (0.5" to 394")
FApprovalsUL, ULc, CE