Instructions for use SS 20.515
Page 8
Supply voltage
For operation in accordance with its designated use, the sensor requires
a DC voltage with a nominal value of 24 V with a permissible tolerance of
± 10 %. The typical operating current is approx. 60 mA and at most
100 mA
2
.
Operate the sensor only within the defined range of operating
voltage (24 V DC ± 10 %).
Undervoltage may result in malfunction, overvoltage may lead
to irreversible damage.
The specifications for the operating voltage are valid for the connection
to the sensor. Voltage drops generated due to line resistances must be
taken into account by the customer.
Analog outputs
The analog outputs of the sensor (flow and temperature) are designed
as high-side drivers, i.e., the apparent ohmic resistance R
L
must be con-
nected between the respective signal output and the reference potential
for the sensor outputs (GND, see following figures). The outputs have a
permanent short-circuit protection against both rails of the operating
voltage, while the maximum load capacitance is 10 nF.
There are two output versions (selected by ordering):
- Current interface:
Display range:
4 ... 20 mA
Error signaling
3
:
2 mA
Maximum load resistance R
L
:
300 Ω
Maximum load capacitance C
L
:
10 nF
Maximum recommended cable length:
100 m
Wiring:
Figure 4-1
2
Both signal outputs 22 mA (maximum measuring values), minimum operating voltage.
3
Signaling as specified in NAMUR NE 43
!
