Calibration
Calibration
4-14
42iQD Instruction Manual
Thermo Scientific
The air flow controllers should be capable of maintaining a constant air
flow within ±2% of the required flow rate. Ensure all devices are properly
calibrated and that all flows are corrected to 25
°
C and 1 atm.
Figure 4–2.
Permeation Tube System
The NO
2
output level is calculated from:
F
K
x
P
=
]
NO
[
T
OUT
2
Where:
[NO
2
]
OUT
= NO
2
output concentration in ppm
P = permeation rate in µg/min
F
T
= total flow rate of gas after mixing chamber (F
P
+ F
D
) in liters/minute
K (NO
2
) = 0.382 constant for NO
2
permeant
Содержание 42iQD
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Страница 182: ...Maintenance Pump Rebuilding 5 8 42iQD Instruction Manual Thermo Scientific Figure 5 3 Pump Rebuilding ...
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