Bosch FAP-DO420 Operation Manual page 36

36 en | Maintenance and Service
Temperature value [°C] (display of the value currently being measured by the thermal
sensor):
FAH-T 420
FAP-OT 420
FAP-OT 420
CO value: Display of the value currently being measured by the CO sensor
The CO value specifies the currently-measured CO concentration.
The specified number is calculated as the difference between the current measurement value
and the stand-by value stored in the detector.
The CO concentration displayed lies in the range between 0 (normal operating condition)
and 555 (max. measurement value of the sensor).
Operating hours counter
Display of the duration of operation since the initial start-up of the detector.
Error code C malfunction
Error code
10000000
11000000
10100000
10011110
0000xxxx
Contamination
The optical initial set-up value of a new detector is stored in the integrated EEPROM during
the final inspection. The contamination value specifies by how much this analog value has
increased in comparison with the delivery state.
F.01U.003.448 | 8.0 | 2011.10
-20 °C. . . +65 °C
-20 °C. . . +50 °C
-10 °C to +50 °C
Cause of trouble and troubleshooting
General C malfunction
Possible causes:
– Thermal sensor fault
– Maximum operation duration (5 years) of the C sensor has been
exceeded.
T and C sensors are switched off; the optical sensor is still in operation.
Exchange detector immediately!
The impedance of the electrochemical cell is too high.
The C sensor is switched off; the rest of the sensors are still in operation.
Exchange detector immediately!
The permissible operating temperature (-10 °C to +50 °C) has been
exceeded. The C sensor is switched off; the rest of the sensors are still in
operation.
Malfunction due to read/write error in the EEPROM
Detector is switched off and must be exchanged immediately!
Number of read/write errors in the EEPROM
Operation Guide
Automatic Fire Detectors LSN improved
Bosch Sicherheitssysteme GmbH
version