Oceanus OC-903, Operating Manual, Page: 9 / 16

8
OK
main menu
（
Press 5s
）
enter the sub menu Select/save
run/stop
pump switch — —
on/off
（
Press 5s
）
on/off
（
Press 5s
）
on/off
（
Press 5s
）
Attentions
：
OC-903 portable gas detector only available to detect the gas
concentration when the pump on.
5.2 Power on
When power off, long press key for 5s to activate the backlight
and red indicator, then “beep”, then the detector power on. Then the
display will be sensor testing(3s),sensor information(1s),preheating for 60s
with the pump on. After the start-up, then will enter the Testing interface.
5.3 Power off
In normal working status, long press key for 5s, it will power off with
a buzzer tone.