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All Rights Reserved. Copyright © 2000, Yokogawa Electric Corporation
TI 04L01A01-02E
Applications examples using alarm functions
Observation of air pressure and alarm output in a clean room and an environmental testing
room.
In a kind of clean room, inner pressure is higher than surroundings to avoid dust and trash, so generally
observation of air pressure in a clean room is required.
In this case, if instant measured value of inner pressure is set as alarm value, alarm is frequently generated
when operators enter and exit the room. Therefore, only when inner pressure is low during specified time,
alarm generation is needed.
Using the delayed alarm function of DX series, you can set alarm value for specified time.
T
:
Specified delay period
X1
:
The input exceeds the alarm value, but the status does not last specified
time(T). Therefore, alarm does not occur.
X2
:
The input exceeds the alarm level and the status last specified delay period,
so alarm occurs.
X4
:
Alarm is released because the input is higher than the alarm level
Input signal
Alarm level
Alarm status
Occur delayed low limit alarm
Release delayed low limit alarm