KROHNE OPTISENS PAC 050 EN - Manual (Page 9)

Manual OPTISENS PAC 050
9 OPTISENS PAC 050
2. Electrical connection
You will find a detailed connection diagram on the following pages.
Before connecting the power supply check the information on the nameplate of the device!
ATTENTION
Input, output and control lines must be installed separate from each other and separate from power lines!
For inputs and outputs use screened lines and connect the screen on one side only.
The pH measurement is interference-sensitive. Use a special screened cable and over long distances or in
humid atmosphere additionally an impedance converter.
When using the relays, mind that with inductive loads, interference must be suppressed. If that is not
possible, the relay must be protected at the terminal block in the converter by a resistance-capacitance filter
or, in case of direct current, by a free- wheeling diode.
Current up to Capacitor C Resistance R
60 mA 10 nF 260 V 390 Ohm 2 Watt
70 mA 47 nF 260 V 22 Ohm 2 Watt
150 mA 100 nF 260 V 47 Ohm 2 Watt
1.0 A 220 nF 260 V 47 Ohm 2 Watt