Grundfos CU 362 Instrucciones De Instalación Y Funcionamiento página 16

5.5 Analog level sensors
This section describes the most important issues concerning
installation of level sensors.
1
Analog level sensors
Pos. Description
1 Pressure sensor
2 Ultrasonic sensor
Level detection can be done by an analog level sensor.
We recommend the use of one of these sensors:
• pressure sensor
• ultrasonic sensor.
To ensure accurate measurements, it is important that the sensor
parameters are entered correctly.
5.5.1 Pressure sensor
When a pressure sensor is used, special attention must be given to
the sensor setting.
Type of control signal
• 0-20 mA
• 4-20 mA
• 0-10 V.
Measuring range
• Min. value [m]
• Max. value [m].
Float switches can be used as safety high-level, overflow
and dry-running float switches.
16
5.5.2 Ultrasonic sensor
When an ultrasonic sensor is used, special attention must be given
to the sensor setting.
Type of control signal
2
• 0-20 mA
• 4-20 mA
• 0-10 V.
Measuring range
• Min. value [m]
• Max. value [m].
The user must state whether the measuring signal is for water
depth (Δh2) or distance from the top of the pump pit to the water
level (Δh1).
When the distance to the water level is being measured, the user
must enter an "Offset". This offset gives the distance from the
ultrasonic sensor to the top of the pit. Furthermore, the function
"Inverted" must be selected. It is shown if an ultrasonic sensor is
selected. See fig.
Ultrasonic sensor
Pos.
1
2
3
4
5
6
Ultrasonic sensor.
Description
Offset
High level
Δh1
Water level
Δh2
Dry running
1
2
3
4
5
6