Met One Instruments C-12, Руководство по эксплуатации, Страница: 24 / 41

Page 24 C-12-9800 Rev A
If the START softkey is pressed, the monitor will advance to a fresh spot of filter tape, turn on the
pump, and display WAIT TOP-OF-MIN in the status field. Then the status field will change to
SAMPLING… It will take two full minutes before BC concentrations will appear if Sample Time is
set to 1 minute. If Sample Time is set for a longer period, the C-12 will display concentrations after
1 full sample period.
Figure 6-5 C-12 Startup Screens
To stop sampling, press either the ESC or MENU button while on the main screen. This will exit
the main screen and enter the main menu. Place the flashing cursor next to the STOP SAMPLE
option at the top of the menu and press the ENTER key. The C-12 will ask the user to confirm if
the sample should be stopped. If confirmed, the C-12 will stop running and return to the main
menu.
To resume sampling after the unit has been stopped for any reason, return to the main menu. The
top option of the menu will now read START SAMPLE. Place the cursor on this option and press
the ENTER key. The C-12 will ask the user to confirm if the sample should be started. If
confirmed, the C-12 will begin the startup sequence and return to the Sampling Screen.
The Start/Stop Measurement screen can also be accessed by pressing the ENTER key from the
main menu.
Figure 6-6 C-12 Stop/Start Sample Screens
6.4 Load Tape
This screen enables operation of the Measurement Module
assembly and tape spools. Use the OPEN softkey to lower
the bottom of the measurement module and open the tape
path. When opened, the OPEN softkey will read as CLOSE,
indicating that when pressed, the key will close the
measurement module assembly. Use the MOVE button to
advance the tape one sample space. If the measurement
module is closed when the MOVE key is pressed, the C-12
will automatically open it and then advance the tape. See
Section 3.6 for instructions on loading the filter tape.
Figure 6-7 The Load Tape Screen