Instructions for Use
– SCHMIDT
®
Flow Sensor SS 23.400 ATEX 3
Page 15
Analog output
The analog output is protected against a short circuit towards the operat-
ing voltage or the mass.
It is available in two basic versions which differ in the representation range
(final value, directionality):
Current interface:
Signal range:
4 ... 20 mA
Type:
High side driver, load resistance against GND
Maximum load resistance R
L
:
300 Ω
Maximum load capacity C
L
:
100 nF
Maximum cable length:
100 m
Wiring:
Voltage output:
Signal range:
0 ... 10 V
Type:
High side driver, load resistance against GND
Minimum load resistance R
L
:
1
0 k
Ω
Maximum load capacity C
L
:
10 nF
Maximum short-circuit current:
25 mA
Maximum cable length:
10 m (recommended)
Wiring:
The voltage drop
11
in the GND wire of the connecting cable
(mass offset) can significantly affect the analog signal at the volt-
age output.
11
The specific resistance of the lead of the nominal cable (0.14 mm
2
) is 0.138
/m (20 °C);
at L = 10 m a current of I
B,max
= 150 mA can cause a voltage drop of up to 240 mV.
!