FujiFilm ZPA, Service Manual

Page: 39 / 45

TN5A1191-E
31
Moisture interference adjustment is only for NO analyzer and SO
2
analyzer.
Purpose : Adjust the light control plate in between the three layer detector so that moisture interference
becomes close to zero.
Procedure : 1) To start adjustment, set the light control plate at the
same height (10 to 15mm upper than (c): upper end of
the fixing plate) as in the right figure (a).
2) Enter “Maintenance mode”, “1.Sensor Input”.
3) Flow zero gas and gas contained water of 2°C (N
2
balance) to read the count value of each gas.
Respectively replace the read values (in NO, SO
2
component) of Zero with Za and Moisture with Ha.
4) Set the light control plate at the same height (1 to 6mm lower than (c): upper end of the fixing
plate) as in the right figure (b).
5) Flow the gas in the same manner in (3) to read the count value of each gas.
Respectively replace the read values of Zero with Zb and Moisture with Hb.
6) Calculate the Zero point, Zx (count value) as following.
Zx =
©
§
¹
·
(Zb × Ha) – (Za × Hb)
(Zb – Za) – (Hb – Ha)
7) Move the light control plate up and down while flowing zero gas, and adjust its position so that
the value becomes equal to Zx calculated in (6).
When the position of the panel is set, fasten it with fixing screw.
8) After Zero/Span calibration, flow water of 2°C, and check that a deviation is within 1%FS.
9) After confirmation in (8), perform paint lock of the fixing screw of the light control panel.
7. MOISTURE INTERFERENCE ADJUSTMENT
NO, SO
2
detector
Fixing screw
Fixing plate
Light control plate
(a)
(b)
(c)