FAS-420-TM Aspirating Smoke Detector Commissioning | en 77
Bosch Sicherheitssysteme GmbH Operation Guide F.01U.088.878 | 4.1 | 2010.11
6.3 Calibrating the Airflow Sensor
The airflow initialization of the FAS-420-TM is successfully completed if the status of the
temperature and the airflow stabilizes for a period of 2 minutes, i.e.:
– The temperature fluctuates by less than 0.1 °C
– The airflow is not fluctuating too heavily (temperature control)
– The fan voltage can be set normally; fan and fan power pack working normally
The maximum operating period is 2 hours.
The airflow initialization is aborted immediately if one of the following errors occurs:
– Temperature measurement faulty
– Airflow measurement faulty
– Fan control faulty
The calibration of the airflow sensor can be carried out independently of the air pressure or
depending on it.
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.
6.3.1 Air-Pressure-Independent Calibration
Calibration of the FAS-420-TM independently of the air pressure takes place automatically
each time the detector module is inserted into the housing base and the X4 jumper is
replugged, or via the FAS-ASD-DIAG Diagnostic Software.
During the teach-in phase, the alarm detection is fully functional. The operating display
flashes during this time and the airflow must not be influenced in any way. On completion of
initialization, the operating display is permanently lit and the airflow sensor has determined a
target value for the connected pipe system.
6.3.2 Air-Pressure-Dependent Calibration
A calibration of the airflow sensor that is dependent on the air pressure can only be carried
out using the FAS-ASD-DIAG Diagnostic Software. A barometer is required for this
(recommended: GPB 1300 digital precision pocket barometer from Greisinger electronic
GmbH).
The following steps are required:
1. In the "Settings" screen, press the bottom button [Set], so that you can change the
values in the diagnostic software.
Figure 6.1 Inserting the detector module into the housing base
1Housing Base
2 Detector module
3Jumper X4
PIN 1-2 or PIN 2-3
X4
123
X2
X3
X1
FAS- 420-T M
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2
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