Instruction manual
NivuFlow 550
page 76
rev. 00 / 12.04.2017
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Limit Contact Flow
Set one flow limit value for >Threshold On< and >Threshold Off< each. Exceeding
this flow limit value will issue a digital signal. This digital signal will be reset as soon
as the value falls below the second flow limit value = hysteresis function to avoid
output flutter.
After selecting this function the logic can be adjusted as follows:
normally closed
normally open
Fig. 23-31 Programming the limit contact
•
Limit Contact Level
The procedure to use the level limit contact is the same as for the flow limit contact.
Set a level limit value.
The level enabled in >Application</>h-Sensors< for the current level range is used for
calculation. It is not possible to use a free selectable level sensor.
After selecting this function the logic can be adjusted as follows:
normally closed
normally open
•
Limit Contact Velocity
Here the digital signal in the event of overshooting an adjustable velocity limit value
will be issued.
Proceed as described under >Limit Contact Flow<.
The calculated average flow velocity (calculated even from 2 or 3 sensors) is used.
After selecting this function the logic can be adjusted as follows:
normally closed
normally open
•
Limit Contact Sludge
In part filled applications the sedimentation level can be determined and issued.
Prerequisites:
Float used
Determination of sedimentation distance using water-ultrasound from the float
down
Determination of water surface level using an external sensor or air-ultrasonic
sensor type OCL
