Operation
Range Menu
Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-15
information about the single, dual, and auto range modes, see “Single
Range Mode”, “Dual Range Mode”, and “Auto Range Mode” earlier in this
chapter.
Table 3-5 lists the standard ranges. Table 3-6 lists the extended ranges.
When switching from standard to extended ranges, the PMT voltage must
be readjusted. For more information about readjusting the PMT voltage,
see Chapter 7, “Servicing”.
• In the Main Menu, choose Range > NO, NO
2
, or NO
x
Range.
•Use and to scroll through a list of choices.
• Press to save the new range.
Table 3-5. Standard Ranges
ppb ppm µg/m
3
mg/m
3
200 0.2 500 0.5
500 0.5 1,000 1.0
1,000 1.0 2,000 2.0
2,000 2.0 5,000 5.0
5,000 5.0 10,000 10.0
10,000 10.0 20,000 20.0
20,000 20.0 50,000 50.0
50,000 50.0 100,000 100.0
100,000 100.0 150,000 150.0
C1 C1 C1 C1
C2 C2 C2 C2
C3 C3 C3 C3
NO RANGE:
CURRENTLY: 200.0
SET TO: 500.0 ?
©ª
CHANGE VALUE
SAVE VALUE
RANGE AVG DIAGS ALARM
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