QRAE II User Guide
Page 15
4 Operating The QRAE II
4.1
Mode Overview
The QRAE II has three operational modes:
Normal
— see page 16
for detailed instructions.
Diagnostic
— see page 17
for detailed instructions.
Programming
— see page 24
for detailed instructions.
The following is an overview of the three modes:
Normal Mode
is the default mode. It is accessed when you turn on the QRAE II. There
are no access restrictions (you do not need a password), and it provides the indications
and data you need most for typical monitoring applications, including:
Readings of carbon monoxide (CO), hydrogen sulfide (H
2
S), oxygen, and lower
explosive limit (LEL)
Peak
Min (minimum)
STEL (short-term exposure limit)
TWA (time-weighted average)
Battery level and shutoff voltage
Run time since the QRAE II was turned on
Time, date, and temperature
Name of the LEL span gas used for calibration and the measurement gas
Normal Mode also allows you to turn datalogging on and off and communicate with a PC
to download data.
Diagnostic Mode
is primarily designed for technicians during troubleshooting, although it also
offers access to a few changeable parameters that you may rarely (if ever) change. You must use
a password to enter Diagnostic Mode. In Diagnostic Mode, QRAE II displays readings in raw
counts (cts) and units (% or ppm).
Sensor set
Battery type indicator (Li-ion or alkaline)
Display Contrast*
Backlight level and threshold*
Pump stall thresholds*
Parameters marked with an asterisk (*) can be adjusted by entering Programming Mode
from Diagnostic Mode. See Page 24 for details.
Programming Mode
is password-protected and is includes adjustable settings to
accomplish the following:
