<6. SETTING AND CALIBRATION>
6-26
IM 11G02N01-01E
Setting range
• Alarm value : 10 to 1000 ppm
5 ppm step (initial value: 500 ppm)
• Alarm count : 1 to 99 times
(initial value: 5 times)
• Hysteresis : 0 to 20% of full scale
(initial value: 0% of full scale
)
[% full scale] represents the percentage with the CO range regarded as 100%.
Action of peak alarm
(1) A peak count alarm is conductive at 5 times/hour. (ON)
(2) A peak count alarm is open at 4 times/hour. (OFF)
3 hours ago
Current hour
1 hour ago
2 hours ago
Measured values
Peak concentration
Peak count alarm
F6_6 graph.ai
Example
If CO concentration exceeds the alarm value, counting will begin. If the number of peaks is over the
set times per hour, a peak alarm contact output becomes closed (ON). If it is less than the set times
per hour, it is open (OFF). Since 5 times of peaks /hour is marked at (1)
section from the above
graph, the peak count alarm is turned ON. Since peaks of more than 5 times per 1 hour occur at the
interval between (1) and (2)
, the peak count alarm remains ON. Since at (2), peaks are reduced
to 4 times per hour, it is turned OFF.
Like the hysteresis of the alarm setting , the hysteresis prevents possible chattering when measured
gas is fluctuated near the alarm value.
* For 10 minutes after the power is turned ON, a peak alarm counting is not carried out.
Releasing peak count alarm
To release the peak count alarm, set the peak alarm to OFF.
Turning on the peak alarm initiates counting from 0.
Содержание IR400 series
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