GX-3R Operator’s Manual Chapter 4: Display Mode • 35
STEL Screen (STEL)
The STEL Screen displays the short term exposure limit (STEL) readings for H
2
S and CO
only. The STEL reading is the average reading over the last 15 minutes.
TWA Screen (TWA)
The TWA Screen displays the time weighted average (TWA) readings for H
2
S and CO only.
The TWA reading is the average reading over the last 8 hours. If 8 hours have not elapsed
since the last time the TWA reading was cleared, the average is still calculated over 8 hours.
The missing readings are assigned a 0 value. If LUNCH is set to OFF (factory setting), the
TWA is cleared when the GX-3R is turned off.
If LUNCH is set to ON, the GX-3R remembers TWA readings when it is turned off so it can
continue them when it is turned on again. See pg.71 for instructions to turn the lunch break
feature on (default is off).
Combustible Sensor Target Gas Conversion (LIST)
This screen only appears if DISP SET in User Mode is set to ON (factory setting) and if the
instrument’s calibrated target gas is CH4 or iC4H10 (select target gas in Gas Select Mode’s
GAS COMB item, calibrate with target gas in User Mode’s GAS CAL item).
The LIST screen allows you to select a converted target gas based on a CH4 or iC4H10
calibration. It does not change the calibrated target gas. You must go to Gas Select Mode’s
GAS COMB item to change the calibrated
target gas.
Selecting a converted target gas in LIST (based on a CH4 or iC4H10 calibration) does not
provide the same reading accuracy as selecting a calibrated target gas in Gas Select Mode’s
GAS COMB item and calibrating with that target gas in User Mode.
Selecting a converted target gas in LIST does not mean that the combustible gas sensor will
respond only to that gas. The combustible gas sensor responds to a number of gases regardless
of the target gas selection.
However, if H2 is selected as the target gas in LIST, the sensor will not respond to the gases
listed with an “x” in the “Available Target Gas Conversions During LIMITED HC GAS LIST
Status” column of the table below.
If you select a new converted target gas, the change is saved if you turn the instrument off and
on.
STEL
7:49
10 2.0
CO ppm H2S ppm
TWA
7:49
5 0.5
CO ppm H2S ppm
To Next Page
Loading...
Need help?
General
