PR 5211 Instrument Manual  Installing the Instrument 
Sartorius    EN-17 
3.2.4  3 Opto Inputs 
The optocoupler inputs have one common potential (GND), separated from the common potential of the 
output group.  
 
Connecting method 
4-pin plug-in terminal block 
Cable 
Shielded, max. 50 m 
Number of inputs 
3  
Input signal 
External supply required 
10 ... 30 VDC for 'high' 
0 ... 5 VDC for 'low' 
Input voltage 
Max. 30 VDC 
Input current 
< 11 mA @ 24 VDC 
< 5 mA @ 12 VDC  
Potential isolation 
Yes, 3 inputs have got 1 common 
minus potential 
 
Example: contact input connection 
When a voltage ≥10 V DC is applied to the terminals (in the 
example: 1-GND), input 1 is active (true).