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When the Man Down feature is on and there is no gas alarm, the QRAE 3 senses that it is motionless for the

amount of time set in the “Motionless Time” parameter. If the instrument is not moved during that time, then

a pre-alarm is activated to alert the user, and shows the “Are You OK?” screen. Pressing [Y/+] clears the

alarm and returns the QRAE 3 to its normal operation. Pressing [MODE] sets it into Man Down Alarm (and

if wireless connectivity is enabled, a Man Down message is sent in real time to remote observers). If neither

key is pressed, then after the countdown, it goes into Man Down Alarm (again sending a message to remote

observers if wirelessly enabled).

Settings are available for:

 Off/On

 Motionless Time (time the instrument is motionless before initiating a pre-alarm)

 Sensitivity (set to low, medium, or high to compensate for ambient vibration or motion)

 Warning Time (countdown, in seconds, from pre-alarm to Man Down alarm)

When the Man Down alarm is activated, the buzzer sounds and LEDs flash continuously, and a countdown

begins.

 If the QRAE 3’s user presses [Y/+] for “Yes” in response to the “Are You OK?” question on

the screen before the countdown reaches zero, the Man Down alarm stops and the main reading

screen is displayed.

 If the person does not press [Y/+] for “Yes” in response to the “Are You OK?” question on the

screen before the countdown reaches zero, the Man Down alarm is sounded and LEDs flash

continuously.

 If the person presses [MODE] during the countdown, answering the “Are You OK?” question

with “No,” the Man Down alarm starts.

If wireless connectivity is enabled, and the QRAE 3 is connected to a network, a Man Down message is

also sent to remote observers.

8.3.4. Datalog

The instrument displays a floppy disk icon to indicate that a datalog is being recorded. The

instrument stores the measured gas concentration for each sensor, date and time for each

measurement, Site ID, User ID, and other parameters. The QRAE 3 memory is sufficient to

record three months’ worth of data for four sensors at one-minute intervals. All data are retained

(even after the unit is turned off) in non-volatile memory so that they can be downloaded at a later

time to a PC.

8.3.4.1. Clear Datalog

This operation erases all data stored in the datalog.

Note: Once the datalog is cleared, the data cannot be recovered.

Rae QRAE 3 User Manual

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