Product Components - Hach Flo-Tote 3 Manual Básico Del Usuario

generates an electromagnetic field, creating a voltage in the water. The two velocity electrodes along
with the ground electrode measure this voltage. Refer to
higher voltage. By accurately measuring this voltage, the velocity is determined.
Figure 3 Sensor electrodes
1 Ground electrode
Depth measurement
A pressure transducer is used to measure the depth of the water. The transducer is an electronic
device which uses a thin diaphragm to convert pressure to an electronic signal. The depth transducer
is located inside the sensor. The cross channel (located on the bottom of the sensor) allows water
pressure to reach the transducer, while at the same time protecting the fragile diaphragm from
damage.
An air tube, running through the length of cable from the sensor to the desiccant junction box,
enables the transducer to cancel out the atmospheric pressure in order to measure the true water
pressure. The air tube (called the atmospheric pressure reference or APR tube) needs to be
protected from water, which can damage the transducer.
Flow calculations
The velocity and depth measurements are used with the pipe diameter to identify the flow rate. The
flow rate is calculated from the continuity equation (1):
(1) Flow rate = Average velocity × Area
where
Flow rate = volume of liquid passing the sensor per unit of time (e.g., 200 gallons per minute)
Average velocity = average velocity of the liquid, calculated with surface velocity measurements and
algorithms
Area = cross-sectional area of the liquid in the channel, calculated with the channel dimensions and
depth measurement

Product components

Make sure that all components have been received. Refer to
damaged, contact the manufacturer or a sales representative immediately.
Figure 3. A faster water velocity produces a
2 Velocity electrodes
Figure 4. If any items are missing or
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