Open-channel flow measurement is achieved with NIVELCO EasyTREK and EchoTREK ultrasonic level transmitters mounted above the liquid surface over a flume or weir. The transmitter measures the time of flight of an ultrasonic pulse to the surface and back, and the QUEST+ adaptive signal-processing software converts the level to a flow-proportional output using pre-programmed flume/weir parameters. Non-contact operation makes the system ideal for wastewater, stormwater and effluent channels where a contacting sensor would foul or corrode.

Features & Specifications

• Non-contact ultrasonic level measurement for open-channel flow over standard flumes and weirs

• Measuring range up to 25 m (82 ft) with a narrow 5°–7° beam angle

• EasyTREK SP-500/SP-300 integrated (blind) transmitters and EchoTREK SE/SG/ST/SB compact transmitters (2- or 4-wire)

• Accuracy to ±0.05% of range; resolution from 1 mm; full temperature compensation via QUEST+ signal processing

• 4–20 mA analogue output with HART (HART 7 on SP-500); relay and data-logger options

• Transducer materials PP, PVDF, PTFE or 316Ti stainless steel to suit aggressive and hydrocarbon media

• IP68-rated integrated types; plug-in SAP-200 display for compact types; IrDA readout

• ATEX (Ex ia) intrinsically-safe and INMETRO certified versions available

• Wide range of process connections (BSP/NPT threads, DN80–DN300 / ANSI / JIS flanges) plus mounting brackets

• Connectable to MultiCONT controllers or a PC via UNICOMM HART modems (USB, RS485 or Bluetooth)

Dimensions & Technical Data

Transducer dimensional drawings, beam angles, process connections and measuring ranges:

Full technical data — accuracy, outputs, temperature, power supply, protection and mass:

Key technical data: