7
US
4.5 Volumetric flow or temperature monitoring / switching
function
OUTx changes its switching state if it is above or below the set switching limits
(SPx, rPx)� The following switching functions can be selected:
•
Hysteresis function / normally open (fig� 1): [OUx] = [Hno]�
•
Hysteresis function / normally closed (fig� 1): [OUx] = [Hnc]�
First the set point (SPx) is set, then the reset point (rPx) at the requested
distance�
•
Window function / normally open (fig� 2): [OUx] = [Fno]�
•
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�
4.6 Volumetric flow or temperature monitoring / analogue
function
•
The analogue start point [ASP] determines at which measured value the output
signal is 4 mA or 0 V�
•
The analogue end point [AEP] determines at which measured value the output
signal is 20 mA or 10 V�
Minimum distance between [ASP] and [AEP] = 20 % of the final value of the
measuring range�