Thermo Scientific 49iQ Instruction Manual page 154

Calibration
Calibration Photometer System Preparation
4-6 49iQ Instruction Manual
F

o
R

F F
o d
A

2
A
1
R
 
E
A
1
where:
F = Ozonator flow
o
F = Dilutant zero air flow
d
E = Linearity error, in percent
A = Assay of original concentration
1
A = Assay of diluted concentration
2
R = Dilution ratio
Note The inherent linearity accuracy of the 49iQ Primary Standard (or a
49iQ modified as described earlier) is greater than the accuracy
measurements of the mass flow meters.
Use the following procedure to check the calculations are complete and
accurate:
1. With the ozone generator in the manual mode, i.e., gain set to zero,
adjust ozone level to generate a level in excess of 0.5 ppm. Wait until
ozone concentration is stable.
2. From the Home Screen, press Settings>Health Check>Status and
Alarms>Intensity Check. From the Intensity Check menu, select
Intensity A Reference Gas. Wait for stable frequency reading and note
as Io(A). Press the  button to return to the Intensity Check screen.
3. From the Intensity Check screen, select Intensity A Sample Gas. Wait
for stable frequency reading, note as I(A). Press the  button to return
to the Intensity Check screen.
4. From the Intensity Check screen, select Intensity B Reference Gas.
Wait for stable frequency reading, note as Io(B).
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