Sequoia Scientific


FlowControl-Lab is a computer-controlled 3-way valve system for use in flow-through applications on board research vessels or for dock-side sampling.

The system periodically diverts water from the vessel’s flow-through system through a cartridge filter. The periodically filtered measurements allow for high-accuracy differential measurements of particle properties, for example absorption.

FlowControl-Lab is NOT submersible. A submersible version of the FlowControl is available. It is called FlowControl-Sub and is rated to 500 m depth.


  • Periodically filtered measurements allow for high-accuracy differential measurements of particle properties
  • Electrically-actuated three-way ball valve allows flow to be bypassed through submicron filter cartridge before instrumentation
  • Includes valve, power supply, controller, one paddlewheel flow sensor, cables, and Windows software
  • Valve position indicator
  • Flow sensor data indicates proper system functioning, filter fouling and are used for post-processing and QC
  • Removable flow sensor windows for flow visualization, cleaning and servicing
  • Software allows for valve scheduling, manual setting of valve position and logs flow rates and system state to hourly ASCII files
  • Rugged construction for use in laboratory, ship-board, or dock-side applications


Valve and controller

  • PVC body with EPDM O-rings, PTFE seats, and 1/2” NPT or barb fittings (standard)
  • Actuator and valve unit connections IP68 and NEMA 6P rated

Flow sensor

  • Flow rate resolution: approx. 0.13 liter/minute @ 1 Hz

Mechanical and electrical

  • Controller power supply: 120-240 VAC, 50-60Hz
  • Interface: Plug-and-play USB between controller and Windows PC (W7, Vista, and XP[SP3])
  • Dimensions, approx.:
  • Controller: 22.9 cm (9”) H × 20.3 cm (8”) W × 11.4 cm (4.5”) D
  • Valve: 20.3 cm (8”) H × 15.2 cm (6”) Ø
  • Flow sensor: 5.6 cm (2.2”) H × 10.4 cm (4.1”) L × 5.3 cm (2.1”) D
  • Weight, approx.:
  • Controller: 2.6 kg (5.8 lbs)
  • Valve: 2.6 kg (5.7 lbs)
  • Flow sensor: 0.25 kg (0.55 lbs)
  • Cable lengths, approx.:
  • Flow sensors / Controller to PC / to valve: 5 m / 1.5 m / 5 m