The Fuji Electric engineers have developed innovative solutions for ultrasonic flow measurement : PORTAFLOW-C (portable), M-FLOW, TIME DELTA-C (fixed mounted) and the new FST (flange mounted). These instruments are based on transit-time measuring method and are particularly suitable for liquid flow measurement (temperature -40 to +200°C).
Sensors are attached to the outside of the pipeline without cutting or drilling, except for the FST flowmeter.
A pair of sensors are installed on the outside wall of the pipe, facing each other slantingly. Ultrasonic waves are propagated diagonally between the upstream and downstream sensors.
In one case, the wave is "carried" by the fluid, in the other it is "braked". It therefore takes a different time to switch from one sensor to another. This difference is proportional to the measurement principle of ultrasonic flowmeters for liquid speed and therefore to the flow rate of the fluid.
The 32 bits microprocessor based electronics allows a high accuracy (±1%), a response time of 1 second or less, a very good immunity to air bubbles (ABM system) and to change of fluid pressure and temperature (continuous calculation of sonic speed).
Three pairs of sensors offer an accuracy of ± 0.2%. . The FST model is suitable for all energy-saving applications where its high precision and the absence of pressure loss help to reduce consumption and costs.
The FST measurement principle is the transit time difference method with parallel three measuring paths.
TIME DELTA-C ETENDU
|Mounting method||Flanges||Clamp-on outside the pipe|
|Clean liquid with no air bubbles||++||++||++||++||++|
|Protection||IP66||IP65||IP66 (IP67 option)||IP67||IP64|
|Flange mounted||DN50, DN80, DN100 mm||na||na||na||na|
|Clamp-on detectors||na|| FSSA detector|
25 to 225 mm (outside diameter) / -40 to +100°c
50 to 1200 mm (outside diameter) / -20 to +120°c
13 to 300 mm (outside diameter) / -40 to +100°c
200 to 6000 mm (outside diameter) / -40 to +80°c
50 to 400 mm (outside diameter) / -40 to +200°c
|Pressure max||PN40||No limit|
|Fluid temperature||-40°C to +150°C||Depending on the detector used|
|Flow velocity||0 to ±0.3…10 m/s||0 to ±0.3…10 m/s||0 to ±0.3…32 m/s|
|Accuracy||±0.2 %||±1.5 %||±1.0%|
Depending on diameter and velocity
|Power supply voltage||100-240 V AC 50/60 Hz||100-240 V AC 50/60 Hz ou 20-30 Vcc||100-240 V Ac 50/60 Hz||12 hours battery|
12 V Ac ou 100-240 V AC
na : Not applicable
(1) : Suitable under conditions
+ : Suitable
++ : Best suitable