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* This menu is available on wirelessly equipped instruments only. The menu is different for
MultiRAE instruments equipped with optional Wi-Fi and BLE. Refer to page See "Menus and
Submenus" on the previous page for more information. for details.
** Pump-equipped version only.
*** This menu item is shown only if a 3-point calibration is enabled. Change Span2 Value
menu item is only shown if a 3-point calibration is enabled on the instrument through SSDC.
Three-point calibration is disabled by default but can be enabled on MultiRAE and MultiRAE
Pro instruments with 10.6eV PID sensors, including high-range ppm and ppb PID sensors. The
MultiRAE Lite PID sensors only support 2-point calibration.
Editing and Selecting Parameters and Sensors
There are a few basic ways to edit parameters, select sensors, and perform other activities in
the MultiRAE. The actions performed by pressing keys always match 1-to-1 with the boxes
along the bottom of the display and the three keys. Some parameters are edited by scrolling
and selecting individual items (black bars behind white text act as highlighters). Some include
a choice via "radio buttons," where only one item in a list can be selected, while other menus
use boxes for you to "check" with an "X," and these allow for multiple items in a list to be
selected. In all cases of editing, you can save or undo your choice.
Calibration
Use this menu to perform a bump test, zero, or span calibration for one or more sensors and
change the gas concentration value used in bump tests and span calibration, as well as choose
which sensors will be calibrated at the same time.
Bias & Equilibration for Liquid O
Some electrochemical sensors (NO, NH
while most do not. Biased sensors require an equilibration time (also known as warm-up time)
of at least 6 hours, and sometimes more, after installation for the baseline to become stable
enough to calibrate the sensor. Unbiased sensors require at least 10 minutes to stabilize. Once
installed, any sensor bias stays on, even when the meter is off. Therefore, even biased sensors
are ready for immediate use when the instrument is turned on again, and the equilibration time
is needed only when first installed or if the battery becomes completely drained. The SensorRAE
4R+ can be used to maintain bias on NO and other biased sensors, so long equilibration times
can be avoided when installing such sensors into a multi-gas instrument.
CAUTION
If an instrument is calibrated directly after sensor installation (no equilibration time, no use of
SensorRAE 4R+), readings will be seen to decrease until the sensor's bias is stable. Also, this
may trigger a low alarm, even if calibration passes.
Refer to RAE Systems Technical Note TN-114 for a list of biased sensors.
Honeywell MultiRAE Series™
And Other Biased Sensors
2
, Liquid O
) require a bias voltage to detect the gas,
3
2
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