Yokogawa Integral Oxygen Analyzer ZR202 - Manual (Page 113)

<8. Detailed Data Setting>
8-7
IM 11M12A01-02E
In the example in Figure 8.3, the high limit alarm point is set to 7.5 vol%O
2
, the delay time is set to
five seconds, and hysteresis is set to 2 vol%O
2
.
Alarm output actions in each section in this figure are as follows:
A. Although the oxygen concentration value exceeds the high limit alarm setpoint, it falls below
the high limit alarm setpoint before the preset delay time of five seconds elapses. So, no
alarm is issued.
B. The oxygen concentration value exceeds the high limit alarm setpoint and the delay time
elapses during that measurement. So, an alarm is issued.
C. Although the oxygen concentration value falls below the hysteresis set value, the value rises
again and exceeds the hysteresis set value before the preset delay time elapses. So, the
alarm is not canceled.
D. The oxygen concentration value falls below the hysteresis set value and the preset delay
time elapses, so the alarm is canceled.
8.3.3 Alarm Setting Procedure
To set the alarm setpoints, follow these steps:
(1) Press the [Setup] key in the Basic panel display to display the Execution/Setup display.
(2) Select “Commissioning” in the Execution/Setup display. The Commissioning (Setup) display
then appears.
(3) Select the “Alarms setup” in the Commissioning (Setup) display. The Alarms setup display
shown in Figure 8.4 then appears.
• To set the hysteresis, proceed to the following steps.
(4) Select “Hysteresis” in the Alarms setup display. The numeric-data entry display then
appears. Enter the desired hysteresis value as a percent of oxygen concentration. To set 2.5
vol%O
2
, enter “0025.” The hysteresis setting can be in the range of 0 to 9.9 vol%O
2
.
• To set the delay time, proceed as per the following steps.
(5) Select the “Contact delay” in the Alarms setup display. The numeric-data entry display then
appears. Enter the desired delay time, in seconds. To set three seconds, enter “003.” The
delay time setting can be in the range of 0 to 255 seconds.
• To set the alarm point, proceed to the following steps.
(6) Select the “Setpoints” in the Alarms setup display. The Oxygen alarms display then appears,
as shown in Figure 8.5.
(7) When you select “High alarm” in the Oxygen alarms display, the “OFF” or “ON” selection
display then appears. If you select “ON,” the High alarm will then be enabled (enable/
disable).
(8) To set the High alarm values select “Set value” just below the High alarm. The numeric-data
entry display then appears. Enter the alarm set value (percent of oxygen concentration). If
you want to set the alarm value to 10 vol%O
2
, enter “010.”
(9) Set the other alarm settings in the same manner as in the steps above.
NOTE
No alarm is issued when alarm is set to “OFF” (disabled). To use the alarm functions, be sure to
set the alarms “ON”.
8th Edition : Jan.13,2012-00