Bosch FCS-320-TP2 - Calibrating the Airflow Sensor; Air-Pressure-Independent Calibration

104 en | Commissioning Aspirating Smoke Detector
2018.04 | 2.0 | F.01U.130.926 Operation Guide Bosch Sicherheitssysteme GmbH
7.2 Calibrating the Airflow Sensor
Notice!
The aspirating smoke detector must be operated for at least 30min prior to the airflow
being initialized to bring it up to operating temperature.
Described below is the procedure for calibrating the airflow sensor, both irrespective of air
pressure, i.e. in simplified form, and depending on air pressure..
For an air-pressure-dependent calibration, use the air pressure correction tables in the
appendix.
To be able to judge the airflow sensor value correctly during start-up work, always adhere to
the type of calibration in the test log.
7.2.1 Air-Pressure-Independent Calibration
2
1
FAS -420 series
Air-pressure-independent calibration of the airflow sensor
1 Detector module
2 S2 flow-init button
1. Make sure that the aspirating smoke detector has been operating for at least 30minutes.
2. To initialize the connected pipe system, press the S2 flow-init button on the detector
module concerned, until the green operating LED on the unit starts to flash. Initialization
is complete after approx.5s. Following successful initialization, the operating LED lights
up permanently.
3. Connect the housing to the FAS‑420 and check that it is correctly positioned.
No further modifications may be made to the pipe system during or after initialization. The fan
voltage must also remain unchanged following initialization. Otherwise, the initialization
procedure must be repeated.
Notice!
If initialization is not successful, the unit reports a collective fault (fault relay drop off). The
precise cause of the abort can be read out using the DIAG Diagnostic Software.