High And High-High Alarms Triggering - GE Hydran 201i Instruction Manual

Initial
0ppm/24 hr
Example 2: The gas level starts to increase at a rate of 50 ppm/30 days. The daily
trend period is set to 30 days.
Initial
0ppm/30 d
Note the following points:
• If the Hydran 201Ti undergoes a power failure that lasts less than 1/6 of the
trend period, the corresponding trend reading remains constant until the
H201Ti is powered up again.
• If the power failure lasts more than 1/6 of the trend period, the corresponding
trend reading is reset to zero.
• If the user changes the hourly or daily trend period, the corresponding trend
reading is reset to 0.0 ppm/period.

11.4.4 High and High-High Alarms Triggering

If the High alarm relay is set to the Normal or Latch mode, the High alarm is
triggered (the High alarm relay is energized) when one of the alarm conditions exceeds
the corresponding High alarm set point during a period of time exceeding its alarm
delay.
The same way, if the High-High alarm relay is set to the Normal or Latch mode, the
High-High alarm is triggered (the High-High alarm relay is energized) when one of the
alarm conditions exceeds the corresponding High-High alarm set-point during a period
of time exceeding its alarm delay.
Each alarm (High and High-High) can be triggered by one or several of the following
conditions (for details, see Section 11.1.1):
• Gas level (GasLevel submenu).
• Hourly trend (HourlyTrend submenu).
• Daily trend (DailyTrend submenu)
Each alarm condition has an adjustable alarm delay that is common to all levels
(High, High-High, Low and Low-Low) of this condition.
Page 166
After 8 hours
+4ppm/24 hr
Table 11-5: Evolution of the Hourly Trend
After 10 days
+20ppm/30 d
Table 11-6: Evolution of the Daily Trend
Hydran* 201i Instruction Manual
After 24 hours
+9ppm/24 hr
After 30 days
+45ppm/30 d
After 48 hours
+10ppm/24 hr
After 60 days
+50ppm/30 d
MA-033 Rev. 14.0, 12-Nov-18