SBY2xx SBG2xx SBN2xx
Mechatronic flow sensor
8
FE
FE
FH
HY
HY
t
Fno
Fnc
FL
1
0
1
0
1
Fig. 2: Window function
1:
Process value
t:
Time
FH:
Upper limit value
FL:
Lower limit value
HY:
Hysteresis
FE:
Window area
Fno:
Window function NO (normally open)
Fnc:
Window function NC (normally closed)
When set to the window function the upper limit value [FH] and the lower limit value [FL] are
defined. The distance between FH and FL is at least 0.6 % of the final value of the measuring
range. FH and FL have a fixed hysteresis of 0.25 % of the final value of the measuring range.
This helps keep the switching status of the output stable if the flow rate varies slightly.
The switching signal in case of a fault can be set via the parameter [FOU].
4.4 Analogue output
The unit provides an analogue signal of 4…20 mA proportional to the process value.
If the measured value is outside the measuring range or in the event of an internal error, the current
signal indicated in the following figure is provided.
For measured values outside the display range or in case of a fault, messages are displayed (UL, OL,
Err).
The analogue signal in case of a fault can be set via the parameter [FOU].
4.4.1 Volumetric flow monitoring
2
1
FOU=On
[% MEW]
MAW
MEW
[mA]
20
4
22
21,5
130
120
3,5
Err
OL
FOU=OFF
3
4
5
Fig. 3: Characteristics of the analogue output according to the standard IEC 60947-5-7, flow rate
1:
Analogue signal
MAW:
Initial value of the measuring range
2:
Flow
MEW:
Final value of the measuring range
3:
Measuring range
OL:
Above the display range
4:
Display range
Err:
Error state
5:
Detection zone
