QRAE II User Guide
Page 17
Min. This tells you the lowest (minimum) reading for each sensor since the QRAE
II was turned on. Press [Y/+] twice to clear the Peak and Min or [MODE] once to
advance to STEL.
STEL. This provides Short Term Exposure Limit (STEL) data. These are based on 15-
minute STEL values of H
2
S and CO in ppm and 8-hour Time Weighted Average (TWA).
TWA. The TWA (time-weighted average) reading is the average reading of the gas
concentration times the fraction of 8 hours that the monitor has been on.
AVG. The AVG (average) is the running average from the time the monitor was turned
on.
Battery Voltage & Shutoff Voltage. This tells you the battery’s voltage right now and
the voltage at which the QRAE II will shut off. This varies, depending on whether a Li-
ion battery or an alkaline battery adapter is used.
Run time. This tells you in hours and minutes how much time has elapsed since the
QRAE II was turned on. Run time resets to 0:00 every time the QRAE II is turned on.
Date, Time, and Temperature. The full date of month, day, and year, as well as the 24-hour
time in hours, minutes, and seconds, is shown. Temperature is shown in degrees Fahrenheit or
Celsius, depending on the user configuration (see Set Temperature Unit, page 39).
LEL Span Gas, LEL Measurement Gas. These two indications tell you the gas selected
for performing a span and for performing a full measurement on the LEL sensor.
Note: If you access any screen in Normal Mode and leave that screen unattended for a
few minutes, QRAE II automatically reverts to Normal Mode’s main screen.
4.3 Diagnostic Mode
The QRAE II’s Diagnostic Mode can only be accessed at startup time.
To Enter Diagnostic Mode:
1. With the QRAE II turned off, press and hold both [MODE] and [Y/+].
2. When you enter Diagnostic mode, you see the password screen:
Enter Password?
0000
OK Cancel
3. Increase a number by pressing the [Y/+] key (1, 2, 3 ... etc.). Note: The numbers
advance until the number 9 and then “wrap around” to 0 again.
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