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Description of device functions
82
11.9.1
Information on the response of the status output
General
If you have configured the status output for "LIMIT VALUE" or "FLOW DIRECTION", you can
configure the requisite switch points in the SWITCH-ON POINT and SWITCH-OFF POINT
functions. When the measured variable in question reaches these predefined values, the status
output switches as shown in the illustrations below.
Status output configured for flow direction
-Q
a = Status output conductive
b = Status output not conductive
The value entered in the function ON-VALUE defines the switch point for the positive and negative
directions of flow. If, for example, the switch point entered is = 1 m
3
off at –1 m
/h (not conductive) and switches on again at +1 m
point to 0 if your process calls for direct switchover (no switching hysteresis). If low flow cut off is
used, it is advisable to set hysteresis to a value greater than or equal to the low flow.
Status output configured for limit value
The status output switches as soon as the measured variable undershoots or overshoots a defined
switch point.
Application: Monitoring flow or process-related boundary conditions.
A
m
o
• A = Maximum safety:
→ m SWITCH-OFF POINT > n SWITCH-ON POINT
• B = Minimum safety:
→ m SWITCH-OFF POINT n SWITCH-ON POINT
• C = Minimum safety:
→ m SWITCH-OFF POINT = n SWITCH-ON POINT (this configuration should be avoided)
• o = Relay de-energized
Switch-off point/switch-on point
-1
0
+1
b
B
n
n
m
o
Proline Prosonic Flow 91
Q
a
3
/h, the status output switches
3
/h (conductive). Set the switch
C
m
n
o
t
Endress+Hauser
a0001236
a0001235
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