Wafer style ultrasonic flowmeter

Transit time or time of flight flow meters utilize two transducers which function as both ultrasonic transmitters and receivers. The flow meters operate by alternately transmitting and receiving a frequency modulated burst of sound energy between the two transducers. The burst is first transmitted in the direction of fluid flow and then against fluid flow. Since sound energy in a moving liquid is carried faster when it travels in the direction of fluid flow (downstream) than it does when it travels against fluid flow (upstream), a differential in the times of flight will occur.

The sound’s time of flight is accurately measured in both directions and the difference in time of flight calculated. The liquid velocity (V) inside the pipe can be related to the difference in time of flight (dt) through the following equation: V = K * D * dt, where K is a constant and D is the distance between the transducers.

INPUTS: Three 4~20mA analogue inputs, accuracy 0.1%: for temperature, pressure or liquid level signals. Accepts 3-wire PT100 temperature transducer inputs for energy metering calculations.

For analogue circuits use a twisted pair shielded cable, maximum length should be no more than 50 metres. For extended transmission distance up to 1 km, use the RS 485 interface.

Straight pipe: meter installation point should have 10 diameters of straight pipe upstream & 5 diameters straight pipe downstream. Up to 30 diameters of straight pipe may be required from pump discharges.

Humidity: The whole unit can be submerged to a depth underwater ≤2m. (After completely sealing the transmitter after wiring, with the sealent supplied in accordance with the included instructions.)

• Factory manufactured pipe spool, precise positioning of transducers for maximum accuracy & stability
• Pipe diameters DN40 to DN1000 (1.1/2″ to 36″)
• Time of flight measurement
• IP68 water ingress protection
• Multiple outputs, 4 – 20mA analogue, open collector pulse, relay & RS485 comms
• Process fluid temperature of -30℃~160℃
• Process pressure range of 0~2.5Mpa
• Accuracy within ±0.5%
• Energy metering option by connecting PT100 temperature sensors
• No pressure drop across the meter
• No moving parts to wear or clog, use on sewage & river water as well as clean liquid applications
• No low conductivity limits, can achieve stable readings even on RO water
• Operating principle: time of flight (transit-time), 4 byte floating-point operation in accordance with IEEE754
• Accuracy: flow meter: ±0.5%； heat meter: ±1.0%
• Operation: 4-key manipulation with magnetic bar touch or finger touch; simulation keyboard software
• Outputs: Single 4~20mA analogue output, electric resistance: 0~1k, accuracy: 0.1%. Single OCT pulse output. Single relay output
• Data interface: RS485 serial interface, modbus communication protocol
• Pipe materials: Steel, stainless, cast iron, copper, cement, PVC, aluminum, glass & steel
• Pipe diameters: DN40 to DN1000
• Liquid type: Any single phase liquid that can conduct sound waves, such as water, seawater, sewage, plant effluent, chemicals, alcohol, beer, oil,etc
• Process fluid temperature: -30℃~160℃
• Turbidity: ≤10000ppm，without entrained air or bubbles
• Fluid velocity: 0m/s~7m/s
• Temperature: Converter:-20℃~60℃; Transducer:-30℃~160℃
• Supply voltage: DC 8~36V；OR AC 85~264V(optional, to be specified at time of order.)
• Power consumption: 1.5watts