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FS-21 Filter Control

The FS-21 Filter Controller performs the basic tasks for controlling a single or double filter unit with pilot distributors or central control valves. The valve types are selected via configuration and the FS-21 adapts automatically to the selected valve type during the course of operation. Both decarbonisation filters and gravel-packed filters can be regulated.
For more complex applications and an expanded range of functions, we recommend the use of our  FS-201 filter control.


pdf data sheet (english)

pdf description (english)

pdf data sheet (german)

pdf description (german)

pdf software

Technical Data

Operating voltage
230 V, 50 Hz

Fuse protection
4 A T (alternative: 4 A mT)

Power consumption
approx. 10 VA

Option 24 V version (24 V AC valve voltage supply)
max. 20 VA, 1 A T fuse protection

Data retention on power failure
Approx. 72 hours of operating data
Configuration and parameter data are
safely archived in EEPROM.

2 phase-assigned changeover contacts (230 V AC)
2 phase-assigned normally open contacts (230 V AC)
2 neutral changeover contacts
max. contact load: 230 V AC / 2 A
24 V AC / 22 VA for valve control (optionally)

Relay contact data
230 V, 50 Hz, 8 A

4 inputs via optic coupler
Contact load: 10 V DC, approx. 8 mA

Ambient temperature
-20 ... +55 °C

DIN plastic housing for wall mounting
- IP54 / IP64 (optionally)

W / H / D   :   212 x 184 x 94 mm

Ordering information:
FS-21 - 230V AC : E1339
FS-21 - 230V AC / 24V DC : E1340