User Manual

13 • Operation GasWatch 2 Operator’s Manual
Alarms
This section covers alarm indications. It also tells you how to reset the
GasWatch 2 after an alarm has occurred and how to respond to an alarm
condition.
Alarm Indications, GW-2C & GW-2H
The GW-2C and the GW-2H will sound an alarm and the unit will vibrate
when the target gas concentration, CO or H
2
S, rises above the low alarm
point. The GasWatch 2 also sounds an alarm and vibrates when the high
alarm point, the STEL alarm point, or the TWA alarm point is reached. It
also has a low battery warning, a dead battery alarm, an over range alarm,
a sensor failure alarm, and a system failure alarm. See Table 3 below for a
description of each alarm indication.
Alarm Indications, GW-2X
The GW-2X will sound an alarm and the unit will vibrate when the oxygen
concentration falls below the low alarm point or rises above the high alarm
point. It also has a low battery warning, a dead battery alarm, an over
range alarm, a sensor failure alarm, and a system failure alarm. See
Table 3 below for a description of each alarm indication.
The table below summarizes the types of alarms produced by the
GasWatch 2.
Table 3: Alarm Types and Indications
Alarm Type LCD Indications Other Indications
Low Alarm
Concentration of gas
rises above the low
alarm point, or for the
GW-2X, falls below
the low alarm point.
• Gas reading
flashes.
• Back light turns on.
• Pulsing tone once
per second.
• Unit vibrates once
per second.
• Alarm lights flash
once per second.
High Alarm
Concentration of gas
rises above the high
alarm point.
• Gas reading
flashes.
• Back light turns on.
• Pulsing tone twice
per second.
• Unit vibrates twice
per second.
• Alarm light flashes
twice per second.