4. Alarm Functions 4-1. Gas alarm types and alarm setpoints
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A gas alarm is triggered if the concentration of the detected gas reaches or exceeds the alarm setpoints shown in the
following table. (Self-latching)
Gas alarm types include the first alarm (WARNING), second alarm (ALARM), third alarm (ALARM H), STEL alarm
(STEL), TWA alarm (TWA), and OVER alarm (OVER).
Alarm type
First alarm
(WARNING)
Second
alarm
(ALARM)
Third alarm
(ALARM H)
STEL alarm
(STEL)
TWA alarm
(TWA)
OVER alarm
(OVER)
Measured
gas name
Hydrogen
cyanide
Japan
4.7 ppm 9.4 ppm 9.4 ppm 4.5 ppm 0.9 ppm 30.0 ppm
Export
10.0 ppm 20.0 ppm 30.0 ppm 4.5 ppm 0.9 ppm 30.0 ppm
NOTE
The default settings for gas alarm setpoints are as shown in the tables above.
The setting values for the alarm setpoints can be changed. (Refer to ‘6-5. Alarm setpoint setting (ALARM-P)’ in
the Technical Manual.)
HCN
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