SENSITRON
A Halma Company
MT2276E
GALILEO 32
Manual (EN)
P. 48/14
The left arrow going upwards is indicating the “increasing alarms” of the LEL pro-
file where the alarm levels from alarm 1 to alarm 3 correspond to increasing con-
centration.
The configuration software is checking the user input for plausibility. There are
some general rules e.g. alarm level not below 5% of the measuring range, no
higher alarm (alarm 2 or 3) is settable to a level lower than the lower alarm (alarm
1 or 2). Other restrictions are specified in the measurement tasks (profiles).
The horizontal red bars indicate for each alarm threshold the range within which
alarms can be set or modified.
In the profile “Oxygen deficiency” the Oxygen concentration corresponding to
alarm 1 will be higher than for alarm 2 and alarm 3. This will be indicated by the
left arrow going downwards for “decreasing alarms”.
“Overrange” typically is fixed at 100% of the measuring range. Only if in a profile
a fourth alarm level is required “Overrange” will be used as this fourth alarm and
the value is settable.
The “Hysteresis” value indicates how variations in the signal will be ignored when
in close proximity to the alarm threshold.
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Modification of alarm levels
The values can be modified in steps by touching the – on the left or
the + on the right side of the horizontal alarm bar or by typing the
numbers into the numeric indication on the right side. Due to the mod-
ification of one alarm set point also the range of the red bars for the
alarms will be modified accordingly. If the typed value for an alarm
level is outside of the accepted range the plausibility check will modi-
fy it automatically, e.g. when typing in the LEL profile for alarm 3 the
value of “80” corresponding to 80% of the LEL this value will be
corrected to “60” which is the maximum value specified in this profile.
When leaving the screen after modification, the old and sets of param-
eters for the channel are indicated with the modified values in red, in a
windows. The modification has to be confirmed with OK or may be
cancelled.
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Channels Redundancy
If the system requires a very high security level, two detectors are to be
placed at each measuring point. “Profile” and “Gas Type” have to be
identical.
