10
*Note: The setting should meet AH-EH
≥
AL+EL
Alarm Relay
During normal operation when the alarm is not active, the alarm output will
be in its NORMAL condition, the N/O (normal open) contact will be open.
When the alarm is active, the alarm output will be in its ALARM condition
and therefore the N/O contact will be closed.
Alarm Hysterisis
In a normal condition an alarm turns on and off at the same value. For
example, if a high alarm turns on at 2000 uS/cm the alarm occurs when the
reading increases to 2000 uS/cm. When it decreases through 2000 uS/cm the
alarm turns off.
Some applications may demand that the alarm turns off at a different value,
for a high alarm this would be value lower than the alarm value, and for a low
alarm this would be a value higher than the alarm value.
The hysterisis value determines the difference between the alarm switch on
point and the alarm switch off point. In the case of a high
alarm, hysterisis
Code
Content
Set range
Unit
AH
High alarm value
0~18.00/0~1999 M
Ω·
cm / uS/cm
EH
High alarm
hysteresis
0~18.00/0~1999
M
Ω·
cm / uS/cm
AL
Low alarm value
0~18.00/0~1999 M
Ω·
cm / uS/cm
EL
Low alarm
hysteresis
0~18.00/0~1999
M
Ω·
cm / uS/cm
Table 1 Alarm value setting program
content
