ENMET PGD2Manual.pdf - Manual (Page 12)

ENMET Corporation PGD3-IR
9
6.7 STEL and TWA (LTEL) Values
The current STEL and TWA (LTEL) values may be viewed via the menu button (Section 6.4). These values represent the calculated
Short Term Exposure Levels (STEL) and Time-Weighted-Average (TWA)/Long Term Exposure Levels (LTEL) for the toxic gases to
which the user has been most recently subjected.
Press the menu button until, the user is prompted to press the up arrow key to view the readings:
Sequential operation of the up arrow key shows in turn the STEL and TWA(LTEL) readings for toxic sensor 1 followed by those for
toxic sensor 2 and for the infrared carbon dioxide,
for Example :
Readings for toxic sensor – Hydrogen Sulphide
Readings for infrared sensor - Carbon Dioxide
Pressing the menu button after viewing the above displays returns the instrument to the next menu item.
To Clear/Reset the STEL and TWA values turn off the PGD3 instrument.
STEL
H
2
S 15 ppm
LTEL
H
2
S 5 ppm
LTEL
CO
2
5000 ppm
STEL
CO
2
2410 ppm
COSHH VALUES
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