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4.7 Start-up delay [dSt]
If the start-up delay is active ([dSt] > [0]), note: as soon as the volumetric flow
quantity exceeds 0�5 % of the final value of the measuring range (VMR), the fol-
lowing processes are carried out:
•
The start-up delay is activated�
•
Output 1 switches as programmed: ON for NO function, OFF for NC function�
•
Output 2 switches when the flow is evaluated ([SEL2] = [FLOW]) as pro-
grammed: ON for NO function, OFF for NC function)�
[dSt] only has an effect on the switching signals for volumetric flow monitoring�
After the activation of the start-up delay there are 3 options:
•
The volumetric flow quantity increases quickly and reaches the switch point /
good range within dSt → outputs remain active.
•
The volumetric flow quantity increases slowly and does not reach the switch
point / good range within dSt → outputs are reset.
• The volumetric flow quantity falls below 0.5 % within dSt → outputs are imme
-
diately reset; dSt is stopped�
Example: dSt for hysteresis function
1
Volumetric flow quantity Q reaches 0.5% of VMR → dSt starts, output becomes active.
2
dSt elapsed, Q reached SP → output remains active.
3
Q below SP, but above rP → output remains active.
4
Q below rP → output is reset.
5
Q reaches again 0.5 % of VMR → dSt starts, output becomes active.
6
dSt elapsed, Q has not reached SP → output is reset.
7
Q reaches SP → output becomes active.
