Product Number: 4850
Use the Sigma 920 for dual channel or redundant collection system flow monitoring. Measures average velocity directly, without the need for flow profiling. Can log level and velocity data for more than 90 days without needing to change batteries. Review, Overview and Specifications for more information.
The rugged housing of the Sigma 920 Area Velocity Flow Meter is NEMA 6P sealed to withstand submergence and prolonged surcharge conditions. A low power draw creates an extended 90-day battery life. Its size makes it portable and provides for easy storage and fit in a variety of applications such as sewer and storm water monitoring.
The technology used in the Sigma 920 flow meter automatically corrects the effect of temperature on level measurement for a higher level of accuracy. With built in sampler pacing capabilities, it is ideal for CSO and storm water studies.
Advanced, ultrasonic one-MHz Doppler sensor technology avoids signal dropouts and ensures—without the need for on-site calibration—high levels of accuracy in low-flow, fullpipe, or reversed-flow conditions. The patented* “Drawdown Correction” feature corrects the effects of velocity on accurate level measurement. *Patent U55691914
The optional rainfall logging feature of the Sigma 920 flow meter records and characterizes rain events—a true innovation in water monitoring. With multiple sensor options, this meter can be used for redundancy, averaging, and multiple pipe monitoring.
The Submersible Area Velocity Sensor used with the Sigma 920 flow meter is accurate and reliable for maximum versatility for most open channel applications. It installs quickly and easily with no velocity calibration required. The hydrodynamic body and side-mounted cable also maintains accuracy by reducing turbulence along the sensor body. Noryl sensor housing dramatically improves sensor robustness and integrity. Single point calibration (atmospheric) makes calibration quick and accurate.
The Sigma 920 Area Velocity Flow Meter is ideal for short-term flow studies, sanitary sewer evaluation studies, CSO studies and monitoring, and NPDES stormwater compliance.
*when applicable
Phase Out
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Obsolete
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If applicable, please view Replacement Product above or contact Hach Customer Service for further assistance.