Hach EM950 Manual Básico Del Usuario página 7

3.2 Product overview
The portable velocity system is used in the field, laboratory and municipalities. Turbulent, noisy and
low flows can be measured with this system.
When the sensor is placed in flowing water, a magnetic field around the sensor creates a voltage
proportional to the flow velocity. This voltage amplitude, which represents the rate of water flow
around the sensor, is detected by electrodes in the sensor and processed by the sensor
microprocessor. The processed signal is digitally transmitted through the sensor cable to the portable
meter and the information is shown on the meter display. The system includes a portable meter,
sensor with cable and accessories.
The meter and sensor get velocity information in conduits and streams. These measurements are
important for calibration in municipal wastewater industries, as well as for environmental-impact
evaluations.
Two types of sensor are available: velocity-only and velocity plus depth. This manual covers both
types of sensors. If information applies to a specified type of sensor, this fact is noted in the text.
3.2.1 System overview
An overview of an assembled system is shown in
the individual components or accessories for more information.
Figure 1 Assembled components
1 Portable meter
2 Sensor height lock/release device
3 Top setting wading rod (accessory)
4 Sensor cable
Figure 1. Refer to the documentation supplied with
5 Adjustable mount for portable meter
6 Sensor assembly
7 Flow direction
English 7