28 • Chapter 4: Display Mode
GasWatch 3 for CO and O
2
TWA Screen (TWA)
The TWA Screen displays the time weighted average (TWA) reading for the CO channel 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 value of 0. If
LUNCH
is set to
OFF
(factory setting), the
TWA is cleared when the GasWatch 3 is turned off.
If
LUNCH
is set to
ON
, the GasWatch 3 remembers the TWA reading when it is turned off
and can continue accumulation when it is turned on again (see pg.14).
Changing the User ID (USER ID)
This screen only appears if
DISP.SET
in User Mode is set to
ON
(factory setting) and if
ID
DISP
in Maintenance Mode is set to
ON
(factory setting is
OFF
).
Use this screen to select a user ID from the 128 user IDs that are stored in the GasWatch 3’s
memory. Before a user ID is selected on a brand new instrument, the user ID is “----------”.
The factory-installed user IDs have a “U_ID_XXX” format.
The user ID provides a way to identify the GasWatch 3 user during a data logging session.
User IDs can only be selected in this menu item. In order to edit the 128 user IDs, you must
use the GasWatch 3 Datalogging Program or GasWatch 3 Setup Program.
1. After entering Display Mode, press and release POWER/MODE until the
USER ID
screen sequence appears.
2. To change the User ID, press and release AIR. The current User ID flashes.
3. Use AIR to scroll to the desired User ID.
TWA
5
ppm
UID_001
Id
USER
CHG / AIR
Id
USER
NO / MODE
Id
USER
UID_001
Id
USER
