IFM Electronic Efector 300 SI1004 Notice D'utilisation page 20

Function and features
The flow sensor
• detects the flow velocity in liquid media,
• converts it into an analog output signal (4 ... 20 mA),
• and indicates the relative flow value within the adjustable detection
range by means of LEDs:
- LED 0 = lower limit of the detection range (maximum value / LO)
- LED 9 = upper limit of the detection range (minimum value / HI)
• It is also possible to indicate:
- Excess flow: LED 9 flashes if the flow is considerably higher
(2 LEDs) than the display range; output current > 20 mA.
- Underflow / flow standstill: LED 0 flashes if the flow is lower than
the display range.
The output signal corresponds
to the characteristic curve of the
sensor. Like the row of LEDs it
indicates the relative flow veloci-
ty within the detection range set.
Internally the signal change
between LO and HI is divided
into 10 parts and displayed by
the row of 10 LEDs and the cur-
rent output.
characteristic curve
0
LO
LED
0 1 2 3 4 5
output signal in mA
sensor
signal
HI
6 7 8 9
20,0
18,4
16,8
15,2
13,6
12,0
10,4
8,8
7,2
5,6
4,0
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