Yokogawa IR200 - Manual (Page 72)

7 - 3
IM 11G02M01-01E
7.4 Moisture interference compensation adjustment
(1) Be sure to carry out moisture interference compensation adjustment at the following timing
when NO or SO 2 is included in components to be analyzed.
1) Before starting operation for the first time after the analyzer is incorporated into the system
2) At periodic inspection to be performed at 6 month to 1 year intervals
3) After the cell is cleaned
(2) Adjustment procedure (See “Moisture Interference Compensation Adjustment screen” in
“6.8 Maintenance mode.”).
1) Set the moisture interference correction value to 0 in advance. (Press RESET on the moisture
interference adjustment screen.)
Select “Without” for moisture content in calibration gas. (See “6.2.2 Setting of calibration
gas.”)
2) Perform zero/span calibration after warm-up operation of the main unit is completed.
Calibrate zero gas and span gas also by feeding dry gas to the analyzer.
3) Perform bubbling (humidification) of zero gas, and feed it to the analyzer through the
dehumidifier (such as electronic cooler) installed within the sampling system so that the
moisture content becomes the same as that of the sample gas. (See the figure shown below.)
4) Select Moisture Interference Adjustment screen in “6.8 Maintenance mode”.
5) When the numeric value (measurement value) at
left in the moisture interference adjustment
screen (see figure at right) stabilizes, change the
numeric value at right (interference correction
value), adjusting so that the value falls within 0
±
10, and press the key to confirm the selection.
<How to feed gas for moisture interference adjustment>
Dehumidifier
(such as
electronic cooler)
Zero calibration is
performed with dry
gas in this line.
Zero gas
Flow meter
Bubbler
(humidification)
OUT
IN
Gas analyzer
(IR200)
Span gas