Instruction manual

12.0 TROUBLESHOOTING SM425 INSTRUCTION MANUAL
3. The oxygen sensor assembly is damaged.
< Troubleshooting and
1. Confirm the following and correct as necess
a. er ammed i th the
concentration of zero gas in use.
b. re ro gas t
2. No further action e alarm cle
3. The sensor cell assembly requires replacem eck
the cell gas :
a. Select the detailed data display by p e basic panel
b. When the y is pressed once, th the top line
1
c. Verify the cell voltages are within ±
Table 12-3 Oxygen Concentration and Cell Voltage
Oxygen
Concentration (%O
2
)
Cell
voltage
Corrective Actions >
ary. Then re-calibrate:
The “Z o gas conc.” progr n “Calibration setup” menu agrees wi
There a no leaks in the ze
is required if th
ubing.
ars following the re-calibration.
ent if re-calibration did not clear the alarm. Ch
voltages when passing the zero and span gas before replacement by
ressing the detail display key in th
display.
▼ ke e cell voltage should be indicated on
(Figure 2-5).
10 mV of the values in Table 12-3.
(mV)
1% 67.1
21% 0
4. Verify sensor assembly damage using the following procedure:
a. elect the detailed data display.
b. Select “Calibration time history” by pressing the ▼ key (Figure 12-6). Since the ten
actor and zero-correction factor values can be checked in this
display, deterioration of the sensor is shown by large changes between factors.
S
previous span-correction f
42500001 REV A 193