Pipe Range:– 13mm to 4500mm. Transducer Temp Range:– -40°F to 150°C (-40° to 300°F) Power:– 100 –240VAC 50/60Hz. Internal Rechargeable Battery:– 18 hours from full charge. Programming:– via 5 key input controller. Display:– White, backlit matrix – displays flow rate, totalizer, operating mode and calibration menu. Data Logger:– Programmable 300,000 data point capacity, time and date stamped or formatted reports including total, average, minimum, maximum and times of occurrence. Sensitivity:– fully adjustable. Damping:– fully adjustable. Outputs:– Opto isolated/4–20mA (500ohm) when AC powered USB for Data Log transfer by direct PC connection.
What are Doppler Flow Meters?
Doppler flowmeters are a type of ultrasonic flow meter. Using a scientific principle called the Doppler effect to measure the volumetric flow of liquids through a pipe. This works in such a way that the Doppler flow meter is clamped onto the outside of the pipe wall, so that it does not disrupt flow, as is required for other types of meters.
Doppler flow meters use the frequency of an ultrasonic beam to determine the flow rate of liquids. For a Doppler flow meter to work properly and achieve good flow measurements, the liquid must contain particles or bubbles, so one works well for dirty liquids but is not very effective for clean. The flow meter will permit ultrasound signals, and this is reflected by the suspended solids, which causes the frequency of the signal to shift. The frequency shifted is what is measured by the flow meter.
A Doppler flow meter converts the measured frequency shift to a volumetric flow rate. The velocity of the flow in the pipe is calculated using the frequency shift, original frequency, speed of sound through the transmitter material, and the sine of the angle it entered the liquid. Once velocity is known, the volumetric flow rate can easily be.
Doppler flow meters can be a good monitoring option because they do not disturb the flow and require little maintenance.