Crowcon Gas-Pro - Alarms

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2.5 Alarms
The Gas-Pro has the following types of alarm:
• Low battery
• Instantaneous
• Time weighted average (TWA)
2.5.1 Low battery alarm
When the Gas-Pro warns of a low battery, the sounder will emit an audible double blip every 5
seconds and, if congured to do so, the +ve Safety™ LED will change state. This means the
battery has at least 20 minutes of battery life remaining. After 20 minutes the Gas-Pro will enter full
alarm state and the battery icon will ash empty.
!
Users should nish their current activity and move to a safe area as the instrument will
power off without further warning unless charged.
2.5.2 Instantaneous alarm
The Gas-Pro will go into alarm immediately if the level of any of the gases it is congured to detect
become outside acceptable limits. A minimum and maximum acceptable level is set for oxygen, for most
other gases the Gas-Pro will go into alarm state 1 or 2 according to which level has been exceeded.
In the alarm state, the ‘bell’ alarm symbol on the LCD screen will show a
or to indicate which level
of alarm has been triggered. In alarm, the sounder will emit a tone and the Gas-Pro will vibrate. The LEDs
will ash red and blue, and the background of the LCD will change colour from green to red and the gas in
alarm display will invert periodically. Symbols on the LCD will show the level and nature of the alarm.
2.5.3 Time weighted average alarm (TWA)
When activated, the Gas-Pro begins a new record for each toxic gas being monitored where it stores
information about gas levels detected. If the average levels detected over a period of time exceeds
predetermined levels, the Gas-Pro will go into alarm.
In the alarm state, the TWA symbol
on the LCD screen will indicate a 15 minute or 8 hour limit . The
sounder will emit a tone and the Gas-Pro will vibrate. The LEDs will ash red and blue, and the background
of the LCD display will change colour from green to red.
The LCD display will indicate the alarm has been triggered by exposure over time rather than
instantaneously. Levels are set for a short period of 15 minutes and a longer one of 8 hours.
!
TWA alarms cannot be cleared. (The 8 hour TWA can be reviewed in the user menu - see
Section 2.6.4 on page 28). The TWA can only be cleared by turning the Gas-Pro off (see
Shut down on page 32). Refer to Health and Safety guidelines on TWA alarms.
i
If TWA is monitored with the +ve safety™ conguration, the TWA +ve safety alert is only
cleared by downloading the datalog via Portables Pro.
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