6.2.3 Detection of Alarm Conditions
Each gas and moisture alarm source has the same set of five parameters:
• Two set points: Alarm Hi SP and Alarm Hi-Hi SP
• One delay: Alarm Delay
• Two relay assignations: Alarm Hi Relay and Alarm Hi-Hi Relay
Note: The parameters pertaining to gas alarm conditions are grouped in Alarms >
Alarms Setup > Gas Alarm Setup (see Section 3.3.2.1). Those for moisture alarm
conditions are grouped in Alarms > Alarms Setup > H2O Alarm Setup (see Section
3.3.2.2).
A gas or moisture alarm condition is detected when a source exceeds one of its
two set points for a period of time exceeding its delay. Upon detection, the relay
assigned to this alarm condition is activated (energized) and a message appears on
the display (see Section 3.1.2.1).
Note: The above explanation is true if this relay is set to the Normal or Latch mode.
For more information, see Section 6.5.
6.2.4 Setting the High Alarm Condition
Before setting the gas or moisture level High alarm condition, the gas and
moisture level readings should be monitored over a minimum period of two weeks.
A simple method to monitor this value is to consult the Hydran M2-X’s history files
using its keypad (see Section 3.4.2).
Follow these rules:
• Adjust the High set point above the highest reading that was obtained.
• Adjust the High set point low enough to detect the earliest sign of an
abnormal increase of gas.
• But set it at a value high enough to minimize the likelihood of unnecessary
alarms.
Table 6-2 below contains suggested guidelines for setting the gas level High
alarm condition, according to the maximum reading obtained during the monitoring
period.
This Chapter contains examples of how to set the gas alarm
parameters of the Hydran M2-X. The values used are
fictitious and do not correspond to any standard. General
Electric does not suggest nor recommend specific alarm set
points for gases or moisture. It is solely the responsibility of
the user to determine the appropriate settings.
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