RKI Instruments HS-04 - TWA Screen (TWA); User ID Screen (USER ID)

HS-04 Operator’s Manual Chapter 4: Display Mode • 31
TWA Screen (TWA)
The TWA Screen displays the time weighted average (TWA) reading.
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 HS-04 is turned off.
If LUNCH is set to ON, the HS-04 remembers the TWA reading when it is turned off and can
continue accumulation when it is turned on again (see page 16).
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 HS-04’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 HS-04 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 04 Series Datalogging Program or 04 Series 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.
H2S
5.0
TWA
ppm
USER
ID
U_ID_001
USER
ID
CHG / AIR
USER
ID
NO /MODE
USER
ID
U_ID_001