Portable ultrasonic doppler flow meter measurement solutions, clamp on and non-invasive, for closed pipe applications. Uses the doppler ultrasonic flow meter principle for no interruption to process or downtime whilst the instrument is being used.
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 that measures the volumetric flow of liquids through a pipe. These Doppler flow meter are clamped onto the outside of the pipe wall, so that it does not disrupt any flow, as is required for other types of meters.
Doppler flow meters use the frequency of ultrasound 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, therefore works well for dirt filled liquids but are not as effective on purely clean water. The flow meter will permit ultrasound signals, that then is reflected by the suspended solids, which causes the frequency shift in the signal. The frequency shifted is how a flow meter gets measurments.
Doppler flow meters will convert changes in frequency shift to a volumetric flow rate. The velocity of the flow throughout the pipe is then calculated using this change in frequency shift, along with the original frequency, the speed of sound through the material that is transmitting, and the angle it entered the liquid. Once the velocity is known, the volumetric flow rate is calculated by multiplying the velocity by the pipe area.
Doppler flowmeters are a good option for monitoring, as they don’t disturb flow of materials and require very little maintenance.