Yokogawa Integral Oxygen Analyzer ZR202 User Manual

Page 107

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IM 11M12A01-05E

8-10

In the example in Figure 8.2, the high-limit alarm point is set to 7.5% H

2

O, the delayed

time is set to five seconds, and hysteresis is set to 2% H

2

O.

Alarm output actions in this figure are expressed as follows:

(1) Although the measured value “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) The measured value “B” exceeds the high-limit alarm setpoint and the delayed time

has elapsed during that measurement. So, an alarm results.

(3) Although the measured value “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) The measured “D” has fallen below the hysteresis set value and the preset delayed

time during measurement has elapsed, so the alarm is canceled.

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