KROHNE OPTISENS AAC 050 EN - Manual (Page 11)

Manual OPTISENS AAC 050
11 OPTISENS AAC 050
2.2 Connection diagram wall-mounting enclosure
Connection
Terminals Notes
1 = screen
2 = measuring electrode
3 = reference electrode
1 - 4
4 = counter electrode
Metal electrode &
membrane sensors
without electronics
With 2-electrode sensors bridge 3 + 4
1 + 2 = Measurement
3 = - 6V
Membrane sensors
with electronics 1 - 4
4 = + 6V
Pt100 / NTC 6 - 7
Display contrast Display Potentiometer to adjust the display contrast
Analog output 11 + 12 11 = +, 12 = - ; max. burden 500 Ohm
Relay 1 14 + 15
Relay 2 16 + 17
Relay 3 18 + 19 Alarm relay
Power supply 20+21+22 check information given on nameplate
RS 485 (option) 23 + 24 23 = -, 24 = +,- Jumper A bridged = terminating impedance
activated
Digital input 26 - 27 26 = +, 27 = -, external controller stop or lack of water sensor or
flow meter
Flow measurement:
26 = white, 27 = brown