Yokogawa Integral Oxygen Analyzer ZR202 - Manual (Page 90)

<8. Detailed Data Setting>
8-7
IM 11M12A01-04E
In the example in Figure 8.2, the high alarm point is set to 7.5% O
2
, the delayed time is set to five
seconds, and hysteresis is set to 2% O
2
.
Alarm output actions in this figure are expressed as follows:
(1) Although oxygen concentration measurement “A” has exceeded the high alarm setpoint, “A” falls
lower than the high alarm setpoint before the preset delayed time of five seconds elapses. So,
no alarm is issued.
(2) Oxygen concentration measurement “B” exceeds the high alarm setpoint and the delayed time
has elapsed during that measurement. So, an alarm results.
(3) Although oxygen concentration measurement “C” has fallen lower than the hysteresis set value,
that measurement exceeds the hysteresis set value before the preset delayed time has elapsed.
So, the alarm is not canceled.
(4) Oxygen concentration measurement “D” has fallen below the hysteresis set value and the preset
delayed time during measurement has elapsed, so the alarm is canceled.
8.4.3 Alarm Setting
Set the alarm setpoints following Table 8.7 listing parameter codes.
Table 8.7 Parameter Codes for Oxygen Concentration Alarms
Set item Parameter code Set value
Oxygen concentration
high-high alarm setpoint
D01 0-100% O
2
Oxygen concentration
high alarm setpoint
D02 0-100% O
2
Oxygen concentration
low alarm setpoint
D03 0-100% O
2
Oxygen concentration
low-low alarm setpoint
D04 0-100% O
2
Oxygen concentration
alarm hysteresis
D30 0-9.9% O
2
Delayed alarm action D33 0-255 seconds
Oxygen concentration
high-high alarm detection
D41 0 Not detected
1 Detected
Oxygen concentration
high alarm detection
D42 0 Not detected
1 Detected
Oxygen concentration
low alarm detection
D43 0 Not detected
1 Detected
Oxygen concentration
low-low alarm detection
D44 0 Not detected
1 Detected
CAUTION
Even with alarms set, if “Not detected” has been set in the above alarm detection, no alarm is issued.
Be sure to set “Detected” in the above alarm detection if you use alarm features.