Figures 11–13 show the fault diagnosis of the chlorine sensors 0794, 0795 and 0801, respectively. Tables 3–5 show the diagnosis anticipation of our approach regarding the events reported by the WU experts. Each row represents a sensor fault detection produced by our approach. The columns start detection and end detection are the date interval during which our approach detects a sensor fault, the column event reported is the date when the WU expert detected the fault and anticipation is the number of days in advance provided by our approach regarding the event reported.
Table 3
Fault detection, diagnosis and anticipation of sensor 0794
| Start detection | End detection | Event reported | Anticipation (days) | |
|---|---|---|---|---|
| 1 | 2014-04-06 | 2014-04-22 | 2014-04-23 | 16 |
| 2 | 2014-04-27 | 2014-05-01 | ||
| 3 | 2014-05-02 | 2014-05-11 | ||
| 4 | 2014-06-11 | 2014-06-13 | 2014-06-16 | 5 |
| 5 | 2014-07-13 | 2014-08-19 | 2014-08-19 | 37 |
| 6 | 2014-08-22 | 2014-08-25 |
| Start detection | End detection | Event reported | Anticipation (days) | |
|---|---|---|---|---|
| 1 | 2014-04-06 | 2014-04-22 | 2014-04-23 | 16 |
| 2 | 2014-04-27 | 2014-05-01 | ||
| 3 | 2014-05-02 | 2014-05-11 | ||
| 4 | 2014-06-11 | 2014-06-13 | 2014-06-16 | 5 |
| 5 | 2014-07-13 | 2014-08-19 | 2014-08-19 | 37 |
| 6 | 2014-08-22 | 2014-08-25 |
Table 4
Fault detection, diagnosis and anticipation of sensor 0795
| Start detection | End detection | Event reported | Anticipation (days) | |
|---|---|---|---|---|
| 1 | 2014-03-11 | 2014-03-16 | 2014-03-17 | 6 |
| 2 | 2014-04-04 | 2014-04-07 | ||
| 3 | 2014-05-24 | 2014-05-25 | 2014-05-27 | 3 |
| 4 | 2014-05-30 | 2014-06-09 | 2014-06-04 | 5 |
| 5 | 2014-06-20 | 2014-06-26 | ||
| 6 | 2014-07-18 | 2014-08-10 | 2014-08-11 | 23 |
| 7 | 2014-08-27 | 2014-09-04 | 2014-09-02 | 5 |
| 8 | 2014-09-12 | 2014-09-21 | 2014-09-23 | 10 |
| Start detection | End detection | Event reported | Anticipation (days) | |
|---|---|---|---|---|
| 1 | 2014-03-11 | 2014-03-16 | 2014-03-17 | 6 |
| 2 | 2014-04-04 | 2014-04-07 | ||
| 3 | 2014-05-24 | 2014-05-25 | 2014-05-27 | 3 |
| 4 | 2014-05-30 | 2014-06-09 | 2014-06-04 | 5 |
| 5 | 2014-06-20 | 2014-06-26 | ||
| 6 | 2014-07-18 | 2014-08-10 | 2014-08-11 | 23 |
| 7 | 2014-08-27 | 2014-09-04 | 2014-09-02 | 5 |
| 8 | 2014-09-12 | 2014-09-21 | 2014-09-23 | 10 |
Table 5
Fault detection, diagnosis and anticipation of sensor 0801
| Start detection | End detection | Event reported | Anticipation (days) | |
|---|---|---|---|---|
| 1 | 2014-03-16 | 2014-03-18 | ||
| 2 | 2014-03-28 | 2014-04-07 | 2014-04-07 | 9 |
| 3 | 2014-04-11 | 2014-04-27 | 2014-04-28 | 17 |
| 4 | 2014-05-09 | 2014-05-09 | ||
| 5 | 2014-05-22 | 2014-05-24 | ||
| 6 | 2014-05-28 | 2014-06-01 | ||
| 7 | 2014-06-02 | 2014-06-14 | 2014-06-16 | 13 |
| 8 | 2014-07-31 | 2014-08-03 | ||
| 9 | 2014-08-05 | 2014-08-10 | ||
| 10 | 2014-08-11 | 2014-08-25 | ||
| 11 | 2014-09-04 | 2014-09-05 | ||
| 12 | 2014-09-12 | 2014-09-25 | ||
| 13 | 2014-09-28 | 2014-09-29 | ||
| 14 | 2014-10-01 | 2014-10-11 |
| Start detection | End detection | Event reported | Anticipation (days) | |
|---|---|---|---|---|
| 1 | 2014-03-16 | 2014-03-18 | ||
| 2 | 2014-03-28 | 2014-04-07 | 2014-04-07 | 9 |
| 3 | 2014-04-11 | 2014-04-27 | 2014-04-28 | 17 |
| 4 | 2014-05-09 | 2014-05-09 | ||
| 5 | 2014-05-22 | 2014-05-24 | ||
| 6 | 2014-05-28 | 2014-06-01 | ||
| 7 | 2014-06-02 | 2014-06-14 | 2014-06-16 | 13 |
| 8 | 2014-07-31 | 2014-08-03 | ||
| 9 | 2014-08-05 | 2014-08-10 | ||
| 10 | 2014-08-11 | 2014-08-25 | ||
| 11 | 2014-09-04 | 2014-09-05 | ||
| 12 | 2014-09-12 | 2014-09-25 | ||
| 13 | 2014-09-28 | 2014-09-29 | ||
| 14 | 2014-10-01 | 2014-10-11 |
Figure 11
Chlorine signals from 0794 sensor and X127701D and fault diagnosis.
Figure 12
Chlorine signals from 0795 sensor and X127701D and fault diagnosis.
Figure 13
Chlorine signals from 0801 sensor and X127701D and fault diagnosis.