Caution, 3 alarm setting – Yokogawa Integral Oxygen Analyzer ZR202 User Manual
Page 96
IM 11M13A01-04E
8-8
In the example in Figure 8.2, the high-limit 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-limit alarm
setpoint, “A” falls lower than the high-limit alarm setpoint before the preset delayed
time of five seconds elapses. So, no alarm is issued.
(2) Oxygen concentration measurement “B” exceeds the high-limit 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 hyster-
esis 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
D01
0-100% O
2
high-high alarm setpoint
Oxygen concentration
D02
0-100% O
2
high-alarm setpoint
Oxygen concentration
D03
0-100% O
2
low-alarm setpoint
Oxygen concentration
D04
0-100% O
2
low-low-alarm setpoint
Oxygen concentration
D30
0-9.9% O
2
alarm hysteresis
Delayed alarm action
D33
0-255 seconds
Oxygen concentration
D41
0: Not detected
high-high alarm detection
1: Detected
Oxygen concentration
D42
0: Not detected
high-alarm detection
1: Detected
Oxygen concentration
D43
0: Not detected
low-alarm detection
1: Detected
Oxygen concentration
D44
0: Not detected
low-low-alarm detection
1: Detected
T8.7E.EPS
CAUTION
Even with alarms set, if “Disabled” has been set in the above alarm detection, no alarm
is issued. Be sure to set “Enabled” in the above alarm detection if you use alarm
features.