| Thermal differential part: FAP-DOTC420, FAP-DOT420, FAP-OTC420, FAP-OT420 | 
A2S / A2R / BS / BR, in line with EN 54-5 (programmable) | 
| Gas sensor | 
In ppm range | 
| Individual display | 
LED red | 
| Color code | 
  | 
| FAP-DOTC420 | 
2 yellow concentric loops | 
| FAP-OTC 420 | 
Yellow loop | 
| FAP-DOT 420 | 
2 black concentric loops | 
| FAP-OT 420 | 
Black loop | 
| FAP-DO420 | 
2 gray concentric loops | 
| FAP-O 420, FAP-O 420 KKW | 
No marking | 
| FAH-T 420, FAH-T 420 KKW | 
Red loop | 
| Monitoring area | 
  | 
| FAP-DOTC 420, FAP-DOT 420, FAP-DO 420, FAP-OTC 420, FAP-OT 420, FAP-O 420 | 
Max. 120 m2 (Heed local guidelines!) | 
| FAH-T 420FAH-T 420 KKW | 
Max. 40 m2 (Heed local guidelines!) | 
| Maximum installation height | 
16 m (Heed local guidelines!)
 
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