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Teledyne API Model 200A NO
X
Analyzer Instruction Manual, 02246, Rev. G, DCN 5247
Table 6-6-5: Example of AutoCal Setup
Step Action Comment
1. Press SETUP-ACAL This button sequence will cause the AUTOCAL menu to be displayed
2. Press PREV-NEXT Press PREV-NEXT until SEQ 2 is displayed
3. Press MODE Select the MODE menu
3. Press PREV-NEXT Press PREV NEXT to scroll to SPAN
4. Press ENTR ENTR selects the SPAN MODE
5. Press SET Select the SET menu to change the sequence attributes
6. Press PREV-NEXT Scroll the SET menu to TIMER ENABLE
7. Press EDIT Allows changing the TIMER ENABLE attribute, select ON
8. Press ENTR ENTR changes TIMER ENABLE to ON
9. Press PREV-NEXT Repeat steps 6-9 for each attribute
10. Press EXIT Press the EXIT key to return to upper level menus
6.5 Permeation Tube
NO
2
- nitrogen dioxide - is normally a gas at room temperature and pressure, but can be liquified
at moderate pressures. The permeation tube consists of a small container of NO
2
liquid, with a
small window of PTFE which is permeable to NO
2
, see Table 6-6-6. The gas slowly permeates
through the window at a rate in the nanogram/min range. If the tube is kept at constant
temperature, usually about 50 C, the device will provide a stable source of NO
2
gas for a year or
more. See below for permeation tube ordering information.
The NO
2
concentration is determined by the permeation tube specific output (ng/min @ 1 slpm
@ 50
o
C), the permeation tube temperature (
o
C) and the air flow across it (slpm). The specific
output in ng/min is a fixed function of the permeation tube and is noted on shipping container.
The ng/min units can be converted to ppb units by the following equation:
mole/cc500,24
min/cc560
NOmole/gr46
min)/ng(outputtubeperm
NOppb
2
2
Where:
perm tube output (ng/min) = The perm tube output in nanograms/minute
46 gr/mole NO
2
= The molecular weight of nitrogen dioxide (NO
2
)
560 cc/min = The flow rate of zero air over the permeation tube
24,500cc/mole = The volume of air (at 25 C and 1 atm pressure) that contains 1 mole of air
molecules
6-5
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