Flow control using ultrasonic sensors Type: DW-S

The functional principle of the DW-S Flowtransmitter is based on two ultrasonic sensors which are placed in opposing positions. The delay'time of the sound depends on the velocity of the flow. Both sensors work alternately as transmitter and receiver. The difference of the delay time is proportional to the flow velocity. The HSW system works unlike other ultrasonic measuring systems parallel to the liquid stream. This system offers high accuracy, an excellent measuring dynamic and the possibility to measure very high flow speed without reduced cross-section in a very compact design.

Specifications:

• Measuring ranges: 0.5 – 80 l/min. / 1-180 l/min. / 8-1000 l/min.
• Sensors: Stainless steel 1.4571
• Housing: Aluminium, die cast
• Measurement Flow speed, flow quantity
• functions: and totaliser
• Display: 2 x 16 digits illuminated
• Power supply: 24 V DC ± 15 %
• Power consumption: 200 mA max.
• Relays: 30 V DC/1 A (2x) SPDT
• Signal output: 4 – 20 mA, 0 – 210 V, frequency (adjustable max. 32 kHz)
• Interface: RS232, RS-485 (with optional interface cable only)
• Measuring principle: Ultrasonic transit-time difference method
• Medium: Acoustical conductive fluids, gas solids contents ≤ 10 volume %
• Operation: 3 buttons at the front side
• Flow direction: Optional (housing is rotatable)
• Accuracy: ± 2 % v. M.E. at norm conditions
• Operation temperature: - 10–60 °C
• Operation temperature (medium): - 20 – 100 ° (higher on request)
• Pressure loss: No cross-section reduction
• Max. pressure: 25 bar
• Protection class: IP 67
• Unities: Selectable
  
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