RKI Instruments GX-82 - Manual (Page 11)

Model GX-82 Instruction Manual Operation • 7
Alarms
This section describes the GX-82’s gas alarms. Table 3 lists the low and high alarm levels
for each channel.
Combustibles (%LEL)
• If the target combustible gas exceeds the first alarm setting (10% LEL for most
applications), a pulsed tone sounds and the COMB LED flashes.
• If the target combustible gas rises above the second alarm setting (50% LEL for most
applications), the alarm tone and LED are continuous.
• If the reading is above the detection range of the combustibles sensor (100% LEL), a
steady alarm sounds and the combustible gas reading is replaced by the word
OVER .
Oxygen
• If the oxygen content of the air drops below 19.5%, a pulsed tone sounds and the OXY
LED flashes.
• If the oxygen content of the air rises above 23.5%, a steady alarm tone sounds and the
OXY LED remains on.
• If the reading is above the detection range of the oxygen sensor (40.0%), a steady
alarm sounds and the oxygen reading is replaced by the word
OVER .
H
2
S
• For GX-82’s with H
2
S detection, if H
2
S exceeds the first alarm setting (10.0 ppm for
most applications), a pulsed tone sounds and the H
2
S LED flashes.
• If H
2
S rises above the second alarm setting (30.0 ppm for most applications), the
alarm tone and LED are continuous.
• If the reading is above the detection range of the H
2
S sensor (100 PPM), a steady alarm
sounds and the H
2
S reading is replaced by the word OVER .
CO
• For GX-82’s with CO detection, if CO exceeds the first alarm setting (25 ppm for most
applications), a pulsed tone sounds and the CO LED flashes.
• If CO rises above the second alarm setting (100 ppm for most applications), the alarm
tone and LED are continuous.
• If the reading is above the detection range of the CO sensor (300 PPM), a steady alarm
sounds and the CO reading is replaced by the word
OVER .
Table 3: GX-82 Alarm Levels
Channel Low High
LEL 10% LEL 50% LEL
O
2
19.5% O
2
23.5% O
2
H
2
S 10.0 ppm 30.0 ppm
CO 25 ppm 100 ppm