Operating the MultiRAE Plus
To complete step two of calibration, a Span Gas Calibration must be
performed for each sensor.
The instructions below are for a standard confined space entry
instrument utilizing CO, H
For this calibration you will need the standard RAE Systems MultiRAE
Plus 4-gas calibration mix
(50% LEL methane, 20.9% oxygen, 25 ppm
S, 50 ppm CO in a single gas cylinder). For the calibration of other
toxic sensors, or to calibrate a single sensor, please go to the Program
Mode section of this manual.
The first step of calibration is a Fresh Air
The monitor will cycle through each sensor.
When the process is complete, the display will
read, “Zero Cal Complete!”.
Zero Organic Filters for Zeroing PID
Use an optional external zero organic filter (P/
N 008-3024-000, 3-pack) when the ambient air
may be contaminated with hydrocarbons.
Attach the filter to the MultiRAE Plus during
fresh air calibration. The filter can be used
up to 20 times before disposing. This filter
removes most heavier organic and inorganic
compounds, but may not completely remove
lighter compounds such as methane, propane,
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