GX-6000 Operator’s Manual
Chapter 3: Operation • 51
STEL Screen
The STEL Screen displays the short term exposure limit (STEL) readings
for H
2
S, CO,
and high range VOC only
. The STEL reading is the average reading
over the last 15
minutes
.
TWA Screen
The TWA Screen displays the time weighted average (TWA) readings
for H
2
S, CO, and
high range VOC 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 time is assigned a 0 value for readings. If
LUNCH BREAK
is set to
OFF
, the TWA is cleared when the GX-6000 is turned off.
If
LUNCH BREAK
is set to
ON
, the GX-6000 will remember TWA readings when it is
turned off so it can continue them when it is turned on again. See “Turning On the GX-
6000” on page 25.
STEL
H2S CO
ppm ppm
VOC
ppm
2.0 10
10.0
TWA
H2S CO
ppm ppm
VOC
ppm
0.5 5
5.0