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Chapter 3: Operation
GX-3R Pro Operator’s Manual
Monitoring an Area
1. Start up the GX-3R Pro as described above in “Start Up” on page 22. It is now in Measuring
Mode.
2. Take the GX-3R Pro to the monitoring area.
3. Wait at least 15 seconds and observe the display for gas readings. If a reading is observed,
allow the reading to stabilize to determine the gas concentration(s) present.
If you are sampling with an aspirator adapter, see page 35.
4. If a gas alarm occurs, take appropriate action. See page 39.
5. Do not expose the GX-3R Pro to rain.
6. The GX-3R Pro’s IP 66/68 ratings do not imply that the GX-3R Pro will detect gas during and
after exposure to those conditions. If exposure occurs, dry the instrument with a cloth and
perform a bump test as described on page 68.
7. If the GX-3R Pro gets exposed to flammable liquids:
a. Wipe the instrument off with a cloth dampened with water.
b. Replace the filters as described on page 124 and page 127 if they became saturated
c. Perform a bump test as described on page 68.
8. If you suspect that the GX-3R Pro is not operating correctly:
a. Take the GX-3R Pro to a fresh air environment and perform a demand zero as described
on page 29.
b. Perform a bump test as described on page 68.
Combustible Gas Detection
There are three issues to keep in mind when monitoring for combustible gas.
Response
The combustible gas sensor responds to any combustible gas. The standard calibrated target gas
for the combustible gas channel is methane (CH
4
). If the instrument is setup for and calibrated to
a different combustible gas, such as hexane or propane, the gas name right above the readings
displays as “HC”.
Automatic Conversion
The GX-3R Pro can automatically display converted target gas readings if the instrument’s
calibrated target gas is methane or isobutane. See “Combustible Sensor Target Gas Conversion
(HC GAS LIST)” on page 48.
7:49
20.9 0.00
O2 % CO2 vol%
0 0 0.0
CH4 %LEL CO ppm H2S ppm
