2.7 Monitoring Toxic Gases

The instrument can monitor the concentration of the following toxic gases in ambient air:

• Carbon Monoxide (CO)
• Hydrogen Sulfide (H2S).

The instrument displays the gas concentration in parts per million (PPM) or mg/m3 on the Measuring page until another page is selected or the instrument is turned OFF.

WARNING

If an alarm activates while using the instrument, leave the area immediately.
Remaining in the area under such circumstances can cause serious personal injury or death.

The instrument has four gas alarms for each toxic gas:

• HIGH Alarm
• LOW Alarm
• STEL Alarm
• TWA Alarm.

If the gas concentration reaches or exceeds the alarm setpoint, the instrument:

• backlight turns ON
• a vibrating alarm triggers
• displays and flashes the Alarm icon and either the Minimum icon (LOW alarm) or the Maximum icon (HIGH alarm)
• enters an alarm state.