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Alarm Levels
The three types of user configurable alarms are:
Table 3–2. Alarm Configurations
Alarm Type
Description
STEL:
The Short Term Exposure Limit alarm indicates that measurements
averaged over a running 15-minute interval have exceeded the set
alarm limit. Once this alarm is acknowledged, the letter S appears to
the right of the live measurement for the appropriate detector.
Low Ceiling:
This alarm is a warning that a lowest level threshold has been
exceeded. Once acknowledged, the letter L appears to the right of the
live measurement for the appropriate detector.
High Ceiling:
This alarm is a warning that a second, higher level, threshold has been
exceeded. Once this alarm is acknowledged, the letter H appears to
the right of the live measurement for the appropriate detector. The FID
maximum setting is 30000 ppm.
The three alarm messages appear on the instrument display as follows:
==== ALARM! ====
STEL alarm level
alarm exceeded!
Exit=Clr
PID:
FID:
==== ALARM! ====
Low ceiling
alarm exceeded!
Exit=Clr
PID:
FID:
==== ALARM! ====
High ceiling
alarm exceeded!
Exit=Clr
PID:
FID:
1039ppm
2180ppm
S
S
Press char key
1039ppm L
2180ppm L
Press char key
1039ppm H
2180ppm H
Press char key
Note To display and change the alarm menus, the instrument must be ON
but does not have to be warmed up. ▲
Thermo Fisher Scientific
TVA2020 Instruction Manual
3-11