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• Window function / normally closed (fig� 2): [OUx] = [Fnc]�
The width of the window can be set by means of the distance between SPx and
rPx� SPx = maximum value, rPx = minimum value�
1
2
HY = hysteresis; FE = window; examples for volumetric flow monitoring
When set to the window function the set and reset points have a fixed hysteresis of 0�25 %
of the final value of the measuring range� This keeps the switching state of the output stable
if the volumetric flow varies slightly�
4.5 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�
