RKI Instruments GasWatch 1 - Manual (Page 11)

GasWatch Instruction Manual (Two-Gas) Alarms • 7
Alarms
This section describes the GasWatch’s gas, battery, and malfunction alarms. Table 3 lists
the visual and audible indications for each type of alarm. (See Table 1, “Specifications,” on
page 1 for the default gas alarm points.)
NOTE: The GasWatch automatically displays the reading for the target gas that initiates
an alarm. For example, if the oxygen normal screen is displayed, and the toxic
gas sensor initiates an alarm, the GasWatch automatically switches to the toxic
gas screen.
Responding to Alarms
This section describes response to gas, over range, battery, and sensor failure alarms.
Responding to gas alarms
1. Determine which sensor is initiating the gas alarm.
2. Follow your established procedure for an increasing gas condition or decreasing
oxygen condition.
3. When the display reading decrease below (or rises above for O
2
sensor) the alarm
point, press the MODE button to reset the alarm circuit. The alarm light turns off and
the buzzer silences.
Table 3: GasWatch Alarm Indications
Alarm Type Visual Indications Audible Indication
Gas
(above alarm point;
also below for O
2
)
• alarm light flashes
• gas reading flashes
• back light turns on pulsing tone
Gas 1
(above STEL or
TWA alarm point)
• alarm light flashes
•
TWA or STEL flashes on
display screen
• back light turns on
pulsing tone
Over Range • gas reading replaced by
• over range/peak reading
icon displays in lower left
corner of screen
double pulsing tone
Low Battery • battery icon displays
• internal battery icon flashes none
Battery Failure • gas reading replaced by
FAIL
• battery icon flashes
double pulsing tone
Sensor Failure 2 gas reading replaced by FAIL double pulsing tone
1 The oxygen sensor does not initiate STEL or TWA alarms.
2 If the oxygen sensor fails, the gas reading flashes 0.0% and the buzzer sounds a pulsing tone.