Although Doppler ultrasonic flowmeter is not so accurate as transit time ultrasonic flow meters, Doppler flowmeter can measure dirty liquids ( but it cannot measure clean liquids ), Doppler flow meter can measure sewage flow because sewage is with a lot of solids, at the same time, it is also measured for liquids with lots of air bubbles ;
There are some limits about doppler flowmeter:
1. Sensitivity to temperature changes
Doppler flow transducers is very sensitive to these changes in temperature, concentration, and density, when the contens of pipe have some changes, it may have negetive influences in flow measurement ;
2. Fluids type limitations
Doppler flow meter do not measure clean liquids, liquids of high viscosity, paper slurry,pulp, etc .
3. Output option limitations
Doppler flow meter is just available in 4-20mA, Pulse, Relay output, no data logger, RS485 modbus,GPRS, etc. ( Except for area-velocity floemeter )
Post time: Sep-02-2022