manually reset. The 15 minute TWA alarm will self
clear when the average exposure over the
previous 15 minutes falls below the set threshold.
The 8 hour TWA alarm will self clear when the
average exposure over the previous 8 hours falls
below the set threshold. Average exposure values
are cleared when the instrument is switched off.
A worker should not resume work where the risk of
gas exposure persists until the Safety Officer
declares it safe.
The large button may be used to silence or clear
certain instantaneous alarms as the configuration
permits.
8. Keypad Adjustments
When the instrument is off, calibration and alarm
settings can be viewed and adjusted if required.
8.1 Viewing settings
•
Press both buttons to turn instrument off.
•
Press and hold small button to view the zero
level. The symbol appears. The
numbers will flash until the reading has
stabilised. The reading cannot be adjusted
until the digits stop flashing.
Note. The zeroing facility is not available on
oxygen units.
•
Release small button then press and hold
again to view the calibration level. The
symbol appears. Unless calibration gas
Gasman II
Instruction Manual
Issue 5
Page 18
11/99
