FL1500 Open Channel Stationary Logger

The FL1500 is the most agile Hach flow monitoring solution for measuring and logging open channel flow, working with the largest selection of Hach sensors to accommodate even the most challenging sites and hydraulic conditions.

This multi-channel controller can handle up to four independent flow sensors. The FL1500 can also be paired with peripheral equipment such as a rain gauge, pH sensor, auto sampler, and mechanical totalizer.

Only the FL1500 Flow Monitor allows you to utilize the revolutionary non-contact FLO-DAR AV Sensor in permanent sewer flow monitoring locations. And when it comes to consistently delivering accurate flow data, the FLO-DAR leads all other sensors by staying out of the flow and avoiding fouling. So if you have a permanent site and want to use FLO-DAR, the FL1500 is the way to go.

The FL1500, when combined with the non-contact FLO-DAR sensor and/or FLO-TOTE 3 AV Sensor or Depth pressure with doppler Sub AV, is a highly convenient solution. With RS485, Modbus communication, the FL1500 allows you to easily transfer real-time flow data to SCADA and other data collection systems, control systems and display devices. Plus, the digital display lets you see flow, velocity, level, and totalized flow while right onsite. So whether you need accurate flow measurements for wastewater treatment plant balancing, billing requirements, EPA permitting requirements, inflow/infiltration studies, combined sewer overflow monitoring, process control, sampling pacing, or modeling/sewer system evaluations, the  FL1500 delivers what you need.

Compatible with all of Hach’s flow sensor technologies, it collects reliable flow data from even the most challenging of sites and hydraulic conditions.

Flow sensor technologies include:

  • Non-contact radar
  • Electromagnetic
  • Depth pressure
  • Doppler, ultrasonic
  • Bubble level


  • Power Source: AC Mains or 12V DC
  • Data Transmission: RS232, modbus
  • Compatible Software: FLdata


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