Thermo Scientific 49iQ, Instruction Manual

Page: 154 / 282

Calibration
Calibration Photometer System Preparation
4-6 49iQ Instruction Manual Thermo Scientific
d o
o
F F
F
R


100%
A
R
A
A
E
1
2
1



where:
F
o
= Ozonator flow
F
d
= Dilutant zero air flow
E = Linearity error, in percent
A
1
= Assay of original concentration
A
2
= Assay of diluted concentration
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).