SEFRAM 9891 Manuel D'utilisation page 26

6-2 Automatic Ambient Reset Feature
This Refrigerant leak detector features an Automatic Ambient
Reset function that sets the unit to ignore ambient concentrations
of refrigerant.
▪ Automatic Ambient Setup - Upon initial power on, the unit
automatically sets itself to ignore the level of refrigerant
present at the tip. Only a level, or concentration, greater than
this will cause an alarm.
CAUTION!
Be aware that this feature will cause the unit to ignore any
refrigerant present at turn on. In other words, with the unit off if
you place the tip up to a known leak and switch the unit on, no
leak will be indicated!
▪ Ambient Reset Feature - Resetting the unit during operation
performs a similar function, it programs the circuit to ignore the
level of refrigerant present at the tip. This allows the user to
'home-in' on the source of the leak (higher concentration).
Similarly, the unit can be moved to fresh air and reset for
maximum sensitivity. Resetting the unit with no refrigerant
present (fresh air) causes any level above zero to be detected.
▪ After the unit is warmed up, the default sensitivity level is set at
"Medium" and Auto Reset function is "ON".
▪ Auto Reset function is best used initially when user is moving
around trying to identify leakage source.
source is determined, cancel the Auto Detect function to
Détecteur de fuite de gaz réfrigérant
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Once the leak