Page 408 - Bürkert

Control Functions

General PID control
PID process controller for fixed value, subsequent value or cascade control
Conductivity control
On/off or PI control - continuous dosing through pulse frequency modulation (PFM), PWM or 4-20 mA analog
output, automatic or manual drain
Corrosion display 8620
No controller function, only display of measuring values; impact on general alarm output
pH control
PI control - continuous dosing through pulse frequency modulation (PFM), PWM or analog output
Module for dosing of oxygen scavenger media
Proportional dosing for flow and oxygen content depending on flow with or without temperature input
Chlorine / Redox Control
PI control - continuous dosing through pulse frequency modulation (PFM), PWM or 4-20 mA analog output
Batch dosing
Allows batching of a chemical based on volume of water added
Biocide dosing
14-day program, 8 dosing events per channel / per day; Pre-bleed function to optimize biocide kill time
Monitor module
Display of process value
Totalizer function
Single or dual channel flow totalizer (each having two manually resetable totalizers)

Ordering Chart
Input Output
Analogue Digital Communi-
Analogue input 4 - Digital (on/off Analogue cation
Electrical Hardware input Pt100 - 20 mA or (on/off) or Freq) output Relay Transistor Body
connection version 4 - 20 mA Input Pt100 input input 4 - 20 mA output output Ethernet version Item no.
Screw 1 – – 4 – 4 – 5 – – A 188 133
terminals
– – 4 – 4 4 5 4 X A 188 136
Spring type 2 4 2 – 4 4 2 5 2 – B 188 137
terminals
4 2 – 4 4 2 5 2 X B 188 138

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