Built-In O Sensor (Paramagnetic Type) - Fuji Electric ZPA Service Manual

2) Measures
3) Replacement
4) Adjustment after replacement
After replacement, check next three subjects.
And, perform zero and span calibration.
(5) Built-in O sensor (paramagnetic type)
2
Error mode
Phenomena
Check
Measures
Replacement
Adjustment after replacement : Perform zero and span calibration.
14
: Replace detector.
Precautions on replacement:
The Amplifier board is set according to the specificaions of each detector.
When ordering, notify analyzer serial number, detector serial number and the
detector type (ex. "NO-H"). So the Amplifier board has suitable gain in it.
:
When a cell is a block cell, remove the light source motor unit. The light source motor unit
and block cell are screwed to the detector. Unscrew the detector and then the light source
motor unit and block cell can be separated from the detector. After that, unscrew the block
cell side, the block cell can be separated from the detector. Install a new detector in reverse
procedure of removal.
Caution : Mount the detector in parallel with the cell window and the block cell so as
not to cause poor sealing.
When a cell is a pipe cell, the detector is screwed to the rear of the optical base plate. First,
remove the base plate and then unscrew the detector. Install a new detector in reverse
procedure of removal.
1) check the voltage (DV1-GND on Amplifier board) shown above.
2) check the counter value indicates shown above (with zero gas supply).
3) check resistance (J1-J4,J2-J3 on Amplifier board) shown above.
: Damage to O detector
2
: O detector indication is at 0 and O
2
not even respond to span gas.
: Check of O input voltage
2
Remove the O sensor cable (CN16) on the main
2
board and apply a digital voltage meter between the
connector (1) – (2) and then check that it reads
about 0 V with zero gas and 0.5V to 1V with span
gas. If no change in voltage is made with zero and
span gases, O detector can be damaged.
2
: Replace O detector
2
: Turn OFF the analyzer main unit
Since the O detector case is common to the 0V
2
line, be careful when installing it avoid contacting
the analyzer main unit case and O
Generally, an insulation mounting plate is supplied.
detector will
2
detector case.
2
GND (Main board CN16 No. 2)
+ (Main board CN16 No. 1)
TN5A1191-E