Kobold DF-DL Series, Руководство по эксплуатации

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ZED-D
page 4 ZED-D K11/0522
5. Operating Principle
The evaluation unit changes the frequency signal of the pickup into a 3(4)-digit
flow reading with adjustable scale (topline of display), and a scalable analogue
signal. The dosage is displayed in the bottom line of the display. The unit of
measurement can be selected.
Included are two relays with floated output changeover contacts for various
functions. The relay (S1) can be used to execute the flow monitoring, total volume
monitoring, fine dosage or the pump control.
When the flow is being continuously monitored, it checks if the freely adjustable
limits are exceeded or fallen short of. A choice can be made between threshold
value and window monitoring. Switching point, hysteresis, window point, and
switch-on or switch-off delay can be set as desired. If monitoring of the total
volume is selected, a check is made to see if the adjustable quantity limit is
exceeded.
The dosage relay (S2) switches on when the dosage process starts, and then
switches off again, once the dosage has flowed through. The dosage process can
be interrupted by using the Start/Stop switch. By taking a correction quantity into
account, it is possible to take any special features or conditions of the system into
account. By entering a fine dosage, the bypass valve can be controlled with the
relay (S1). A red LED indicates the relay’s switching status.
The Analogue output is available as a current output with 0(4)...20 mA or a
voltage output with 0...10 V. The parameter names in the menu can be displayed
in either German or English. If used where the flow readings change rapidly, the
display can be pacified and the analogue reading averaged by switching on some
software. If the maximum set flow (exceeded range) is exceeded, it will be shown
on the display. The set parameters can be protected against unauthorised
alteration using a password function.
Range of functions
Dosage and flow meter with digital display, switch and analogue output:
•
Measurement and display of dosage, total and flow Quantities
•
Free scaling using Teach-In or input of frequency and measured value
•
Interval counter (number of dosing processes)
•
2 control inputs
•
1 dosage output
•
1 switching output, freely programmable as flow monitor
or for monitoring the total quantity
•
Analogue output 0(4)-20 mA or 0-10 V