ENMET PGD2 - Manual (Page 12)

ENMET Corporation PGD2
9
6.9 STEL and TWA Values
The current STEL and TWA values may be viewed via the menu button (Section 6.5). These values represent the calculated Short
Term Exposure Levels (STEL) and Time Weighted Average Long (TWA)/ Term Exposure Levels (LTEL) for the toxic gases to which
the user has been most recently subjected.
From the menu, 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 readings for toxic sensor 1 followed by those for toxic
sensor 2, for example:-
Readings for toxic sensor 1 – Hydrogen Sulphide
Readings for toxic sensor 2 - Carbon Monoxide
Pressing the menu button after viewing the above displays returns the instrument to the next menu item.
COSHH VALUES
PRESS [ ] KEY
STEL
H
2
S 1 ppm
TWA
H
2
S 2 ppm
TWA
CO 34 ppm STEL
CO 23 ppm