SICK DOSIC Series, Operating Instructions Manual, Page: 27 / 58

OPERATING INSTRUCTIONS | DOSIC
®
8020955/11HD / 2018-12-12| SICK AG
Subject to change without notice
27
7 COMMISSIONING
• Normal = Analog output signal as configured
• Inverted = Analog output signal is inverted; the value configured for QaHigh
corresponds to 4 mA and the value configured for QaLow corresponds to 20
mA
6. Set QaFail to 3.5 mA or 21.5 mA.
In the event of an error, a corresponding signal is output.
7.5 Advanced functions
7.5.1 Measurement Mode
Two different application specific measurement modes are available:
• Standard : standard measurement mode with high measurement accuracy for
steady/slow changes processes.
• Dynamic : fast measurement mode suitable for dynamic applications (e.g.
pulsating flow pumps).
Configuration
1. Set the parameter Mode in the Meas menu.
The available values are: Stndrd, Dynamc
NOTE
When using the Dynamc measurement mode, it is recommended to increase the sen -
sitivity of the sensor in order to react to changes in the flowrate as quickly as possible.
This may be done by using the following settings in the CutOff menu (see 7.5.3 Zero
flow cutoff):
Set = 0.15 L/min
Reset = 0.05 L/min .
7.5.2 Activate filtering
Smoothing of the measured value, e.g., if flow is irregular (e.g. when pumps are starting
and stopping). For fast changes, the average of the measured values over a predefined
number of seconds is output.
Configuration
1. Set the parameter in the Filter menu.
The available values are: Off, 500 ms, 1 s, 2 s, 5 s, 10 s.
7.5.3 Zero flow cutoff
As the DOSIC
®
is a highly sensitive piece of equipment, the sensor detects even the
smallest movements in the medium. If the flow rate of a medium is zero, this can result
in inaccurate measurements.
The leak flow volume suppression feature helps prevent these measurements from
triggering unwanted switching behavior or causing incorrect meter readings. With this
feature, the sensor treats very low values as zero flow readings. If the flow drops below
a defined reset value, the display and output are reset to zero. When the flow rises
above the defined set value once more, the measurements continue.