Open channel flow measurement
Hach Flow
Loggers and sensors from Hach, including the Sigma and Marsh-McBirney legacy lines.
Hach Flow, with its legacy brands Sigma and Marsh-McBirney, has a long record of innovation and accuracy in open channel flow measurement. We’ve supplied the range since the Marsh-McBirney days in the 1990s.
Hach meters collect flow data and get it to you reliably, for fixed, portable, permanent or temporary use. Sensors range from non-contact types above the flow, which limit fouling, to rugged submerged AV sensors.
Choosing a Hach system
Based on Hach’s own selection guide. We can help you match the system to the site.
Non-contactA flow logger with the Flo-Dar sensor: radar velocity and ultrasonic level from above the flow. Hach’s most versatile option, it limits fouling and avoids confined space entry after installation.
Submerged area velocityDoppler velocity and pressure level from a sensor in the flow, for a wide range of conditions. The Flo-Tote 3 suits very clean water and low velocities or levels.
Ultrasonic levelDown-looking sensors for flumes and weirs, and an in-pipe sensor that removes the ultrasonic deadband in near full pipes.
Redundant levelA submerged AV sensor with an in-pipe ultrasonic sensor, for billing and overflow monitoring.
Permanent powerThe Flo-Station with Flo-Dar, with four 4–20 mA outputs to SCADA, or a Sigma 950 with a submerged AV sensor.
Process control and spot checksThe SC200 controller takes one or two ultrasonic sensors and has a weir and flume library. The FH950 handheld meter covers spot checks and stream gauging.
Loggers5 products
FH950 Velocity Meter
Handheld meter for spot checks and stream gauging
No documents online
FL900 Portable
Flow logger at the core of most Hach systems
No documents online
SC200 Controller
Controller for ultrasonic level and process control
No documents online
Flo-Station
Mains-powered flow monitor for Flo-Dar
No documents online
Sensors5 products
Flo-Dar
Non-contact radar velocity and ultrasonic level
No documents online
Sub AV Sensor
Submerged Doppler velocity and pressure level
No documents online
Flo-Tote 3
Submerged AV for clean water and low flows
No documents online
AV Flow Sensor with Bubbler
Submerged AV with bubbler level
No documents online
Ultrasonic Sensors
Non-contact level for flumes, weirs and pipes
No documents online
Select any product for a closer look and to request pricing.
Ask us about Hach Flow.
Pricing, availability, hire and technical advice from the EDS team.