Schmidt SS 20.600 - Electrical Connection Guide; Connector Pinout and Wire Colors

Instructions for Use – SCHMIDT
®
Flow Sensor SS 20.600 Page 20
4 Electrical connection
Make sure that no operating voltage is active during electrical in-
stallation and that the operating voltage cannot be switched on
inadvertently.
The sensor is equipped with a plug-in connector which is firmly integrated
in the housing (pin assignment see Table 4). The connector has the fol-
lowing data:
Number of connection pins: 8 (plus shield connection at the metallic housing)
Type: Male
Fixation of connecting cable: M12 thread (spigot nut at the cable)
Type of protection: IP67 (with screwed cable)
Model: Binder, series 763
Pin numbering:
View on plug-in connector of sensor
Figure 4-1
Pin
Name
Function
Wire color
1
Pulse 1
Output signal: Flow / volume (digital: PNP)
White
2
U
B
Operating voltage: 24 V
DC
± 20 %
Brown
3
Analog T
M
Output signal: Temperature of medium (Auto-U/I)
Green
4
Analog w
N
Output signal: Flow (Auto-U/I)
Yellow
5
AGND
Reference potential for analog outputs
Gray
6
Pulse 2
Output signal: Flow / volume (relay
13
)
Pink
7
GND
Operating voltage: Ground
Blue
8
Pulse 2
Output signal: Flow / volume (relay
13
)
Red
Shield
Electromechanical shielding
Meshwork
Table 4
The specified wire colors are valid when one of the SCHMIDT
®
connecting
cables is used (see subchapter Accessories, Table 3).
The analog signals have an own AGND reference potential.
The metal sensor housing is indirectly coupled to GND (with a varistor
14
,
parallel to 100 nF) and should be connected to a protective potential, e.g.
PE (depending on the shielding concept).
The appropriate protection class III (SELV) respective PELV (ac-
cording EN 50178) has to be considered.
13
Galvanically decoupled
14
Votage-dependant resistor (VDR); breakthrough voltage 27 V @ 1 mA