Brandson Equipment 302601 Manual Del Usuario página 24

• The CO concentration on the display is less than 10 PPM
• The first digital display shows "-"
8.8 Self test
This device carries out a self test every 10 seconds. If an error occurs during this
test, the device beeps every 40 seconds. At the same time, the yellow LED light
blinks. The display shows "---". In this case, reset the device. If the error persists,
exchange the device immediately.
8.9 End of service life of the CO detector
If the product has reached the end of its service life (approx. 7 - 10 years), a beep
sounds 3 times in succession every 60 seconds and at the same time the yellow
LED blinks.
The device must then be replaced because the sensors can no longer reliably
detect the CO2 levels.
8.10 Calibration
The calibration can only be carried out by experts. Never calibrate this device
by yourself!
The calibration is carried out with a gas concentration of 400 PPM. This will not
reduce the accuracy of the unit. Each device was calibrated before delivery. Press
the "test / hush" key until all 3 LEDs light up. Then release the "test / hush" key. The
green and the yellow LEDs switch off and only the red LED is on.
This means that the calibration mode is activated for 5 minutes. If the device can-
not measure any CO concentration within these 5 minutes, the calibration mode
ends automatically. After calibration with carbon monoxide has been carried out,
all 3 LEDs light up 3 times. The calibration is now completed successfully.
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