Ductus TT

Ultrasonic multipath flowmeter 

For pipes with a diameter of more than half a meter, ultrasonic flow meters have long established themselves as a reliable and convenient flow monitoring method. Measurements in several planes are a recommended method to determine the efficiency of the turbine without the need for calibration meeting the latest international standards. Fixed installed equipment form the basis for verifying the efficiency. A deterioration of efficiency can be detected right away and therefore corrections can be initiated at an early stage.



Ductus TT ultrasonic flow meter   


  Acoustic Paths  

1 – 8

  Accuracy   ± 0,5% with 8 paths
  Range   ± 20 m/s
  Display   4 lines, 20 characters

internal, sampling interval user selectable

  Communication   RS-232, MODBUS, Ethernet, USB

max. 8 x 4-20 mA


max. 4 x 4-20 mA

2 x Relay, 2 x Pulse

  Power Supply   85-264 VAC (50-60 Hz) or 12 VDC
  Battery Backup  

integrated, 2 Ah


Steel, wall mounted

  Dimensions   400 x 500 x 160 mm (WxHxD)


  PDF-Logo brochure for Hydro Power / PDF (2 MB) 


Internal Mount & Feedthrough

The transducer housings are separate from the transducers, allowing transducers to be changed without shutting down the process. Desinged to allow removal of the entire transducer for repair, replacement or cleaning without the need to dewater the pipe.

    Ductus TT internal mount ultrasonic flow meter    DUCTUS TT transducer Feedthrough-35 insertion type ultrasonic flowmeter    



Internal Mount



Frequency   200 kHz   120 kHz    
Beam Width   18° (-3dB)   10° (-3dB)    




Pipe Diameter   1,0 m to 15 m    0,3 m to 10 m     
Pipe Wall Thickness            
– welding socket   n.a.    up to 40 mm     
-thread   n.a.   up to 70 mm     
Pressure Rate  

60 bar 

other ranges upon request


60 bar 

other ranges upon request

Material    Stainless Steel / Polyamid   Stainless Steel    
Cable   twisted pair with shield   twisted pair with shield    
Temperature Range   -10° to 60°C   0° to 40°C    

 320 x 100 x 70 mm



 Ø 1 1/2“

Length 186 mm

Installation   From the inside   

When pipe can be dewatered for installation.

Designed to allow removal of the entire transducer for repair, replacement or cleaning without dewatering the pipe.


4 planes crossed

according to IEC 41 / ASME PTC 18

Ductus TT multipath ultrasonic flow meter solution