KROHNE OPTISENS MAC 080 EN - Manual (Page 25)

ELECTRICAL CONNECTIONS
4
25
OPTISENS MAC 080
www.krohne.com 01/2010 - MA MAC 080 R02 en
Observe the following points
• The relays are a normally open contact only. For driving solenoid vales and other devices use
external power sources.
• During setup, please verify that the relay is not already being used for another function like
flush cleaning.
• Several solenoid valves may be connected to the same terminal block. However, the power
rating of the relay output must not be exceeded.
4.4.1 Connection of automatic cleaning
All sensors are equipped with integrated spray cleaning. The cleaning function is controlled by
the converter relays. A solenoid valve is connected to relay contact 1 or 2, which must be
configured in the sensor menu.
In order not to interfere with the measurement, the output of the sensor is frozen during the
cleaning and for the configured I-time after the cleaning. Additional freeze time can be
configured if required.
CAUTION!
Do not overpower the relay contacts! Max. rating per relay is 250 VAC, 12 A)
Figure 4-9: Connection of two sensors and two flushing valves
1 Converter
2 Flushing water/air
3 Solenoid valve 2
4 Solenoid valve 1
5 Sensor 2
6 Sensor 1
7 Junction box
.book Page 25 Tuesday, January 19, 2010 1:07 PM