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Pag. 17
4.4 Buzzer silence
In order to silence the buzzer, the special magnet must be brought in correspondence with
the hall effect sensor. If the alarm condition persists, after 1 minute the buzzer is reactivated.
4.5 Maintenance
Within the European Union Countries, bump testing and calibration procedures of gas de-
tectors are required by strict regulations. These standards give guidance on the selection,
installation, use and maintenance of gas detectors intended for use in industrial and com-
mercial applications.
The standards require calibration and bump testing as well as recording of the performed
checks and it defines that all gas detectors should undergo periodical operational testing
according to the manufacturer’s specifications. Test results should be recorded into a sui-
table book to be shown to the Authority in case of inspection.
4. Testing, use and maintenance
4.1 Power ON
When the detector is powered on, the LEDs start blinking yellow during warmup time. After
one minute, the LEDs start blinking green during normal status.
Once the warm-up phase is over, the detector can work correctly, although the optimal per-
formances will be achieved after two hours.
4.2 Testing
Detectors are factory calibrated for the specific gas required by the customers. Future adjust-
ment of the preset calibration can be carried out by employing the calibration keypad. Te-
sting should be carried out by using a gas mixture in the appropriate range, along with our
calibration kit.
4.3 Use
The detector works autonomously and automatically. Once adequately connected, no fur-
ther operations are required.
The three LEDs indicate the detector’s working condition.
Table 3) LED colours and their meaning
Colour
Meaning
Yellow blinking
Warmup
Green fixed
Normal status
Yellow fixed
Fault
Red blinking
Alarm threshold 1
Red fixed
Alarm threshold 2
