CM4 Four-Point Continuous Monitor
CM4 Technical Manual
6-5
2 – REVIEW MODE
2 – FAULT HISTORY
3. Press 1 to display the fault history.
F12 END OF CASSETTE
08/26/05 10:30
The display shows the last eight faults stored in fault history.
4. Press either:
• CURSOR ARROW LEFT/RIGHT to scroll forward/backward
to the next/previous event stored
or
• ENTER to repeat the event just displayed
Fault history is not cleared using the RESET key. Press RESET to
return to the Review Menu.
6.4 Function 2.3 – Current TWA
Use the Current TWA (Time Weighted Average) function to display or
print the current TWA for each point monitored since the start of the
current 8-hour TWA. The TWA is the concentration of gas measured
and averaged over the entire period.
6.4.1 Print TWA
See
for an example of a typical TWA printout.
Purpose
The printout of the TWA shows:
• Instrument serial number
• Current date and time
• Customer name and location
• Start and end time
• Elapsed time
• Concentration levels for each point
Instructions
1. Press PROGRAM to exit Monitor Mode.
2. From the 2–REVIEW MENU, choose the subfunction
3–CURRENT TWA.
2 – REVIEW MODE
3 – CURRENT TWA
The display reads:
1 = DISPLAY 2 = PRINT
3. Press 2 to print the TWA history.
The CM4 calculates and prints TWA information based upon the
elapsed time (maximum of 8 hours) from the last entry into Monitor
Mode, power-up, or completed TWA printout until the last sample prior
to leaving Monitor Mode.
08/26/05 13:51 CM4-851-0000 TWA
ABC MANUFACTURING CO., CHICAGO, IL
START TIME:
08/26/05 03:56
END TIME:
08/26/05 11:26
ELAPSED TIME: 7 HOURS 30 MINUTES
POINT 1 GASCAB
16 PPB
AsH3
POINT 2 VALVEBOX 8 PPB
AsH3
POINT 3 OPZONE
0 PPB
AsH3
POINT 4 EXHDUCT 0 PPB
AsH3
Figure 6-4: TWA Printout
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