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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.
