PROGRAMMING & CALIBRATION
3-8
5. Real Time Clock – Adjustable date “Feb 07, ‘00” and time
“hh:mm” Included on datalog reports.
6. Backlight Mode – Manual or automatic. If manual mode is
chosen, pressing the [N/-] key will turn on the LCD
backlight. Automatic mode allows the backlight to turn on
when the ambient light falls below a threshold level preset
in the monitor.
7. Password – A 4-digit numeric character which allows the
user to enter the programming mode when needed. The
manufacturer’s default password is “0000.”
8. Pump Speed – Low or high. The factory default setting is
low, which reduces the flow rate by 30%, but increases the
battery run time by 10%, and increases the lifetime of the
LEL sensor. High speed offers quicker response time. High
pump speed is preferred for reactive and slowly-responding
gases such as Cl
2
, PH
3
, NH
3
, and HCN.
9. Averaging Method – (TWA) Time Weighted Average
(default) or (AVG), the running average.
10. Change Display Language – Select Spanish or English
11. Temperature Units – Select Centigrade or Fahrenheit.
12. Enable/Disable Vibrator – activate or deactivate the
vibration alarm.
3.6. Change Sensor Configuration
Thus function allows the user to change LEL/VOL Sensor type,
change LEL measurement gas, and enable or disable sensors.
Correction Factors
The LEL sensor used in Q-RAE Plus responds to a broad
range of gases having different sensitivities. A correction factor
can be multiplied by the apparent reading to give the true gas
concentration:
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