Monitoring Gas Concentration
WARNING!
If a gas alarm condition is reached while using the device as a personal or area monitor, leave the area immediately: the ambient condition has reached a preset alarm level.
Failure to follow this warning can result in serious personal injury or death.
Toxic Gases
The device displays the gas concentration in parts per million (ppm) or mg/m³ on the measuring page. The device remains on this page until another page is selected or the device is turned OFF.
There are four alarm setpoints in the device:
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High Alarm |
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Low Alarm |
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STEL Alarm |
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TWA Alarm |
Alarm Condition
The backlight turns ON for a user-settable time during an alarm condition.
If the gas concentration reaches or exceeds the alarm setpoint:
| • | the alarm symbol will display and flash |
| • | the icon for the type of alarm will display and flash |
| • | a vibrating alarm is triggered |
| • | an alarm sounds |
| • | alarm LEDs flash |
Low Alarm
If the gas concentration reaches or exceeds the low alarm setpoint the device will:
| • | display the low alarm icon with the gas reading |
| • | enter a low alarm sequence |
The low alarm can be silenced for a few seconds by pressing the button. It automatically clears once the gas level falls below the setpoint.
High Alarm
If the gas concentration reaches or exceeds the high alarm setpoint the device will:
| • | display the high alarm icon with the gas reading |
| • | enter a high alarm sequence |
The high alarm can be silenced for a few seconds by pressing the button while it is still in high alarm. The high alarm is latching and will not reset when gas concentration falls below the HIGH setpoint.
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To reset the alarm, push the button after the gas level falls below the setpoint. |
Refer to the device during turn ON for factory-set alarm points.
STEL Alarm
When the amount of gas detected by the device is greater than the STEL limit:
| • | Alarm sounds |
| • | Alarm LEDs flash |
| • | STEL icon is displayed |
The STEL alarm can be silenced for a few seconds by pressing the button while it is still in alarm.
The STEL alarm is non-latching and will reset when STEL reading falls below the STEL setpoint. The STEL value can be cleared. (® Figure 10 for details.)
TWA Alarm
When the TWA reading reaches or exceeds the TWA alarm setpoint:
| • | Alarm sounds |
| • | Alarm LEDs flash |
| • | TWA icon is displayed. |
The TWA alarm can be silenced for a few seconds by pressing the button while it is still in alarm.
The TWA alarm is latching and will not reset. The TWA value can be cleared. (® Figure 10 for details.)
Refer to the device during test mode for factory-set alarm setpoints.