The LEFM 880 ultrasonic flow meter system provides extremely accurate and reliable flow measurement for large pipes, hydroelectric penstocks and open channels. The LEFM 880 flow meter system consists of electronics and transducers. Each LEFM 880 transmitter is designed to operate with up to 8 pairs of transducers, to allow optimized velocity profile integration in various hydraulic conduits.

• The LEFM 880 has an integral display and digital and analog output capability.
• The NEMA 411P 66 enclosure is designed for rugged or remote applications.
• The LEFM 880 flow measurement systems incorporate several state-of-the-art features that offer much improved reliability, accuracy and data management over competitive systems.
• Transit-time flow meters rely on accurate timing of time ultrasonic signals transmitted between pairs of transducers.
• The advanced signal processing techniques used in the LEFM 880 greatly extend the operating range of the flow meter in applications with solids, aeration, or ray bending.
• The LEFM 880 uses a cross crosscorrelation method to improve signal-to-noise ratios. noise
• The system also uses an Automatic Gain Control (AC) and Zero-Crossing detection to provide the highest Crossing possible timing accuracy.
• The LEFM 880 internal processing is optimized to allow measurements up to 50 Hz. This provides dramatically improved signal and data processing.
• Up to 8 path capability 240 x 128 graphic display LEFMLink programming interface Watchdog timer Freescale/Alterra processors for high reliability Dual oscillators for timing assurance Advanced signal processing with AGC and cross-correlation cross 50 Hz flow measurement capability LEFM 880 flow meters utilize deviation and median filters to eliminate data errors and provide smooth outputs. These techniques offer improved performance and faster response to actual flow changes compared to less sophisticated averaging and rate-of-change of change velocity or flow filters.
• The LEFM 880 utilizes dual oscillators to maintain long term accuracy and reliability. This provides a better assurance of timing accuracy than a simple software softwaredriven self test.
• Digital and analog outputs,Modbus communications for high speed and reliability USB Memory Dual pipe capability

The 8001 transducer is a 1-MHz type suitable for high-accuracy measurement in large pipes. The feedthrough assembly is specifically engineered to facilitate the retraction and removal of the transducer even when the pipe is under pressure.

Moreover, the 8001/8002 setup incorporates dual retaining pins and a tamper-resistant pin guard/retainer, offering features that may not be available elsewhere. These additional features can contribute to enhanced safety and reliability in operation.

On the other hand, the 8005 transducers and 8006 mount assemblies are intended for use in buried pipes and tunnels ranging from 8 ft to 35 ft in diameter. The 8006 mount assembly is specifically designed to minimize flow disturbance over the transducers and incorporates a waterproof connector, allowing for transducer replacement without the need for splicing or rerouting cables.

• See all process measurements
• Remotely scale analog inputs/outputs
• Force analog and pulse outputs to set values for loop verification
• See diagnostic information for the meter and for each ultrasonic path. For example, you can track changes in signal gain or the velocity profile to determine if wax build up or other conditions exist and the effect on overall performance
• Store meter data using the data logging capability. You can create a single continuous file which will log data at regular intervals. You can record the flow profile signature during calibration and later compare it to the in-situ flo profile to determine if any variations exist