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2 performing manual calibration, Alarm setup – Yokogawa Multi Channel Oxygen Analyzer System ZR22/AV550G User Manual

Page 136

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IM 11M12D01-01E

8-10

The action of delay and hysteresis are illustrated in Figure below. Alarm delay and
hysteresis settings apply to all alarm settings for all channels and all averaging groups.

Delay time:
5 seconds

7.5%

High-limit alarm setpoint

5.5%

Oxygen concentration

Alarm output ON

OFF

Hysteresis

2.0%

A

B

C

D

Alarm range

Delay time:
5 seconds

Delay time:
5 seconds

F8.4E.EPS

Fig.8.11 Alarm Output Action with Delay and Hysteresis

Fig.8.11 shows an example with high alarm setting of 7.5% O

2

, alarm delay of 5 sec.,

and hysteresis of 2% O

2

.

A . Although the measured value exceeds the high alarm setting, within the delay time

of 5 sec. it falls within (alarm setting

ᎏ hysteresis) so no alarm is output.

B. The measured value stays outside the alarm setting for longer than the delay time, so

an alarm is output, delayed by the delay time.

C . Although the measured value falls within (alarm setting

ᎏ hysteresis) it does not

stay there for the delay time, so the alarm is not released.

D. After the measured value falls within (alarm setting

ᎏ hysteresis) and stays there for

the delay time, the alarm is released.


1) From basic panel display touch [Setup] key, and the [Execution/Setup] display

appears.

2) Select [Commissioning] --> [Alarm setup] and the Alarm setup display (Fig.8.12)

appears.

Enter

F41E.EPS

Hysteresis: 0. 1 %O2

Contact delay: 3 s

Alarm set points

Except alarm ch.: Yes

Alarm setup

Fig. 8.12 Alarm setting