Level measurement using a single radar sensor

Radar sensors determine the level via distance measurement, thereby enabling contactless measurement.

Mounting situation

 

1 Mounting height
2 Radar sensor
3 Distance to surface measured
4 Calculated water level

The first step is only necessary if you wish to use a radar sensor with a Modbus interface

  1. Enable the Modbus interface and select the settings for the interface to match your sensors (see Device settings , tab "Interfaces").
  2. Enable the sensor supply, select the voltage level and the duration for which the sensor supply is switched on prior to measurement in accordance with your sensor (see Device settings , tab "Sensor supply")
  3. Configure the measurement channel that will be used to record the sensor value. You can use one of the 3 Modbus measurement channels or one of the 2 universal inputs for this purpose.

    You should configure the following settings if you wish to use a Modbus measurement channel (see Sensor settings):

    1. Use "Radar" name for the measurement channel (recommended)
    2. Set the "Mode" to "On" to activate the measurement channel.
    3. Select "Distance" for the "Type"
    4. Configure "Slave address", "Modbus address" and "Function" in such a way that the measurement value can be read from the sensor.

    You should configure the following settings if you wish to use a universal input (see Universal channel):

    1. Use "Radar" name for the measurement channel (recommended)
    2. Set the "Mode" to "0-20 mA" or "4-20 mA" to activate the measurement channel.
    3. Select "Distance" for the "Type"
    4. Configure the scaling via the "0 mA" and "20 mA" fields.
    5. Make sure that "Offset" and "Trimming" are set to 0
  4. Configure the sub level that you wish to use (see Sub Level settings).
    1. Use "Level - Distance" as name for the sub level (recommended)
    2. Select the setting "Distance" for the "Mode"
    3. Select the measurement channel configured in step 3 (i.e. "Radar") from the dropdown list "Sensor List"
    4. Enter the mounting height in the appropriate field
  5. Make sure that the other sub level is disabled.
  6. Configure the main level (see Main Level settings).
    1. Use "Level " as name for the main level (recommended)
    2. Select the sub level configured in step 4 (i.e. "Level - Distance") as "Primary Sub Level"
    3. Set the "Threshold of Primary Sub Level" to 0