Yokogawa IR200 - Manual (Page 59)

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IM 11G02M01-01E
Action of peak alarm
If CO concentration exceeds the alarm value, counting will begin. If the number of peaks is over
the set times per hour, a peak count alarm 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 alarm
To release the peak alarm, set the peak alarm to OFF.
Turning on the peak alarm initiates counting from 0.
• Alarm Value : 0 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)
Setting range
* The hysteresis setting is made in terms of full scale.
Example (ON)
(OFF)