Introduction
Specifications
Thermo Fisher Scientific
Model 42
i
Trace Level Instruction Manual
1-3
The NO and NO
x
concentrations calculated in the NO and NO
x
modes
are stored in memory. The difference between the concentrations is used to
calculate the NO
2
concentration. The Model 42
i
Trace Level outputs NO,
NO
2
, and NO
x
concentrations to the front panel display, the analog
outputs, and also makes the data available over the serial or Ethernet
connection.
Figure 1–1.
Model 42
i
Trace Level Flow Schematic
Table 1–1
lists the specifications for the Model 42
i
Trace Level.
Table 1–1.
Model 42
i
Trace Level Specifications
Preset ranges
0-5, 10, 20, 50, 100, 200 ppb
0-10, 20, 50, 100, 200, 500 μg/m
3
Custom ranges
0-50 to 200 ppb
0-10 to 500 μg/m
3
Zero roise
25 ppt RMS (120 second averaging time)
Lower detectable limit
50 ppt (120 second averaging time)
Zero drift (24 hour)
Negligible
Span drift
±
1% full-scale
Response time (in
automatic mode)
60 seconds (10 second averaging time)
90 seconds (60 second averaging time)
300 seconds (300 second averaging time)
Linearity
±
1% full-scale
Sample flow rate
1 LPM
Specifications
