18 • Chapter 3: Operation GX-3R Operator’s Manual
Chapter 3: Operation
Overview
This chapter explains how to use the GX-3R to perform confined space entry monitoring or
general area monitoring in Measuring Mode.
Start Up
This section explains how to start up the GX-3R, get it ready for operation, and turn it off.
NOTE: The screens illustrated in this section are for a standard 4-gas unit. The screens
displayed by your GX-3R may be slightly different.
Turning On the GX-3R
To illustrate certain functions, the following description of the GX-3R start up sequence
assumes that the following menu items in User Mode are turned on: LUNCH, CAL RMDR,
and BUMP.RMDR in User Mode, and ID DISP and AUTOZERO in Maintenance Mode. If
any of these items are turned off, then the corresponding screens will not appear.
1 . Press and briefly hold down POWER MODE. Confirm that the LCD turns on, the LEDs
flash, the buzzer sounds, and the motor vibrates before continuing with operation.
Release the POWER MODE button when you hear a beep.
2 . If LUNCH is set to ON (factory setting if OFF, see “Updating the Lunch Break Setting
(LUNCH)” on page 71), the Lunch Break Screen appears. The unit counts down from 5
seconds.
a. Continue Accumulating: To continue accumulating peak and time-weighted average
(TWA) readings from the last time the GX-3R was used, press and release POWER
MODE or allow the countdown to reach 0. The short-term exposure limit (STEL)
reading is reset each time the GX-3R is turned on.
b. Reset Accumulation
: To reset the accumulation of peak and time-weighted average
(TWA) readings, press and release AIR before the countdown reaches 0.
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