Yokogawa IR400 - Manual (Page 87)

7- 6
IM 11G02N01-01E
7.3.3 Optical zero adjustment method (optical balance adjustment)
The adjustment is performed at reassembly after removing the sample cell, etc. for cleaning, etc.
If the following operation is maladjusted, the measurement may adversely be affected. If you are
not trained for adjustment, do not carry out this operation but contact the distributor or our service-
man.
Caution
No. of components
to be measured
1-component meter
3-component meter
4-component meter
2-component meter
a
Main
NO-SO
2
CO
2
-CO
NO-CO
CO
2
Main
NO
Main
NO-SO
2
-CO
* O
2
is excluded from the number of components.
* Main is signal input value from the main detector of each component.
Comp is signal input value from interference compensation detector of each component.
If low range exceeds the range of 0 to 10vol%, detector signal of comp is not usable.
NO-SO
2
-CO
2
-CO
b
Comp
CO
2
Comp
NO
Comp
c
—
CO
Main
SO
2
Main
d
—
CO
Comp
SO
2
Comp
e
—
—
—
f
—
—
—
g
—
—
—
h
—
—
—
NO
Main
NO
Comp
— —
CO
Main
CO
Comp
— —
NO
Main
NO
Comp
— —
CO
Main
CO
Comp
SO
2
Main
SO
2
Comp
NO
Main
NO
Comp
CO
2
Main
CO
Main
CO
Comp
SO
2
Main
SO
2
Comp
—
Sensor values of which are not included in measuring components should be ignored.
<Correspondence between measurement detector and indicated position>
(1) Remove the top cover. Allow dry N
2
or air to flow through the analyzer unit
sample gas inlet until the reading
stabilizes. The sample gas is introduced
directly to the INLET of analyzer unit
through the gas cylinder.
(2) Proceed to an optical adjustment in the
maintenance mode. The display on the
operation panel of the main unit is as
illustrated on the right. Balance adjust-
ment is not required if the display falls
within
±
100.
a
b
c
d
e
f
g
h
Piping at optical balance adjustment
Short
Open
Introduce directly from cylinder
(not required
for measuring
unit 1 only)
Optical system 2
(measuring unit 2)
Optical system 1
(measuring unit 1)