SEFRAM 9892 Manuel D'utilisation page 29

(2) Reset function key:
When the Reset button is pressed, the meter will monitor
background status and compensate it. When Reset LED light is
on, it indicates the process is ongoing. Reset light will turn off
and Reset function is performed.
(3) Verify the condition of the unit and sensor:
▪ Set the sensitivity level to "Hi".
▪ Open the Leak Check Bottle cover and slowly move it closer to
snake tube nozzle.
▪ If the indication moves up to high from low then we should
move the Check Bottle away and the LED should go off again.
This shows that the unit is under working condition.
▪ If the unit does not perform as we expect, bring the unit for
maintenance at your local sales office.
(4) Enter the Measuring mode:
▪ Place the tip of the leak-detector probe as close as possible to
the site of the suspected leak. Try to position the probe within
1/4 inch (6 mm) of the possible leak source.
▪ Slowly move the probe past each possible leakage point.
▪ When the instrument detects a leak source, the audible tone will
alarm. Additionally, the visual indicators will light from left to right;
Green LED then Orange LED then Red LED (highest
concentration) as increasing of level indicates that the location is
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Détecteur de gaz combustible