MiniRAE 3000 User’s Guide
26
After the instrument is turned on, it runs through the start-up menu.
Then the message “Please apply zero gas…” is displayed.
At this point, you can perform a zero air (fresh air) calibration. If the
ambient air is clean, you can use that. Otherwise, use a cylinder of zero
air. Refer to Zero Calibration on page 37 for a more detailed
description of zero calibration.
Start zero calibration by pressing Start. You see the message
“Zeroing…” followed by a 30-second countdown.
Note: You can press [MODE] to quit, bypassing the zero air
calibration.
When zero calibration is complete, you see the message:
Zeroing is done!
Reading = 0.0 ppm
The instrument is now sampling and collecting data.
Note: At the Average & Peak, Date & Time & Temperature, Calibration Gas
& Measurement Gas & Correction Factor, and PC Communications screens,
the instrument automatically goes to the main display after 60 seconds if you
do not push a key to make a selection.
Alarm Signals
During each measurement period, the gas concentration is compared
with the programmed alarm limits (gas concentration alarm limit
settings). If the concentration exceeds any of the preset limits, the loud
buzzer and red flashing LED are activated immediately to warn you of
the alarm condition.
In addition, the instrument alarms if one of the following conditions
occurs: battery voltage falls below a preset voltage level, failure of the
UV lamp, or pump stall.
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