Instructions for Use SS 20.260
Page 11
4 Electrical connection
During electrical installation ensure that no voltage is applied
and inadvertent activation is not possible.
The sensor is electrically connected according to Table 5 by means of
the open cable ends of a 4-wire cable firmly fixed to the sensor housing.
Wire color
Designation
Function
Brown
(BR)
Power
Operating voltage: +U
B
White
(WH)
GND
Operating voltage: Mass
Yellow
(YE)
Analog w
N
Output signal: Flow velocity
Green
(GR)
Analog T
M
or
AGND
Output signal: Temperature of the medium
or
Ground connection of analog output
Table 5
Operating voltage
For proper operation the sensor requires DC voltage with a nominal val-
ue of 24 V with permitted tolerance of ±10 % and the sensor is protected
against a polarity reversal.
Deviating values lead to deactivation of the measuring function or even
to failure. As far as it is possible, the LED indication as well as both ana-
log outputs report faulty operational conditions (see chapter
5
Signaliza-
tion
).
Only operate sensor within the defined range of operating volt-
age (24 V DC ± 10 %). Undervoltage may result in malfunction.
Overvoltage may lead to irreversible damage to the sensor.
Wiring of analog outputs
The analog output of the basic variant of the sensor
(“-1”), which
measures only flow velocity, is alternatively (order option) of the type
tension
(0 … 10 V)
6
or laid-out as current interface
(4 … 20 mA). The
enhanced version (“-2”) with an additional analog output for signalizing
the temperature of the medium comes with 2 current interfaces. Either
type of analog outputs exhibits permanent short-circuit protection against
both rails of the operating voltage U
B
.
6
It is recommended, to use AGND as measuring reference potential for tension output.
!
!