Yokogawa IR400 - Manual (Page 52)

6 - 13
IM 11G02N01-01E
Hysteresis (In case of upper limit alarm)
An alarm output is turned ON if measurement value exceeds the upper limit value as shown
below. Once the alarm output has been turned ON, it is not turned OFF as long as the
indication does not fall below the hysteresis width from the upper limit value.
0 to 20% of full scale
[% full scale (FS)] represents the percentage
with the width of the range of each compo-
nent regarded as 100%.
Setting range
Upper limit value
ON (conductive)
OFF (open)
Hysteresis
width
Alarm
Contact output
( )
ENT
ENT
End of Hysteresis Setting
Note
The hysteresis is common to all alarms
(components).
To close the “Hysteresis Setting” or cancel
the mode midway, press the ESC key.
A previous screen will return .
To close "Hysteresis Setting"
ESC
(1) In the “Alarm No. Selection” screen that
appears, point the cursor to “Hysteresis”
by pressing the
or key. Press the
ENT
key.
(2) In the “Hysteresis Value Setting” screen
that appears, enter hysteresis values.
For the value entry, 1-digit value is
increased or decreased by pressing the
or key, and pressing the key
moves the digit. After setting, press the
ENT
key.
6.3.2 Hysteresis setting
To prevent chattering of an alarm output near
the alarm setting values, set the value
of hysteresis.