Theory Of Operation; Velocity Measurement - Hach Flo-Tote 3 Manuel D'utilisation De Base

• Measurement for extremely low velocities and reverse flow
• Operation under free flow, non-free flow or surcharge conditions
• Field replaceable sensor
• No calibration required
• Increased signal intensity for greasing applications
• Flow temperature measurement
Figure 1 Product overview—Flo-Tote 3 sensor with connector
1 Flo-Tote 3 sensor
2 Desiccant container
3 Air reference tube
4 Sensor cable with connector
Figure 2 Product overview—Flo-Tote 3 sensor with bare-wire
1 Sensor cable with bare-wire

Theory of operation

The Flo-Tote 3 open channel sensor directly measures water velocity and depth.

Velocity measurement

The sensor makes use of Faraday's Law of electromagnetic induction to measure water velocity.
Faraday's Law states: A conductor, moving through a magnetic field, produces a voltage.
Because water is a conductor, water moving through a magnetic field produces a voltage. The
magnitude of the voltage is directly proportional to the velocity of the water. The open channel sensor
6 English
5 Lanyard
6 Carabiner clip
7 Desiccant hub
2 Flo-Tote 3 sensor