Hydran* M2-X Instruction Manual
Page 114
MA-029
Rev. 1.0,
30-Jul-18
6.3.1
Sources
An alarm can be triggered by one or several of the following system fault
conditions:
•
Sensor temperature (Low-Low, Low, High or High-High)
•
Base plate temperature (Low-Low, Low, High or High-High)
•
Battery voltage (Low-Low or Low)
•
Sensor condition
•
Faulty connection
•
Power supply voltage loss
•
Internal software loss
•
Internal set-up loss
6.3.2
System Fault Triggers
System fault triggers are alarm conditions that can produce two actions:
•
Display a message on the Hydran M2-X screen. The alarm message is
displayed only if the corresponding alarm set point is adjusted to a value;
if not, it is set to
Off
.
•
Trigger the relay for the alarm due to the system fault condition, if the
corresponding system fault trigger is turned
On
in
Alarms > Alarms Setup
> Sys. Fault Trigger
.
Note: The alarm set point adjustment has priority over the relay triggering. In other
words, the state of the relay is not changed if the alarm set point is adjusted to
Off
.
Some of the system fault conditions have High and High-High alarm set points
and an alarm delay. These conditions are therefore detected the same way as the
gas or moisture High and High-High alarms: the alarm due to system fault
conditions is triggered when one of the system fault conditions
exceeds
the
corresponding alarm set point for a period of time exceeding its alarm delay.
Other system fault conditions have Low and Low-Low alarm levels. For these
conditions, the alarm due to system fault conditions is triggered when one of the
system fault conditions is
lower than
the corresponding alarm set point during a
period of time exceeding its alarm delay.
6.3.2.1
Hydran Sensor Temperature Alarm Conditions
The parameters pertaining to these alarm conditions are presented in Table 6-5
6-5 below. The sensor temperature is measured using a thermistor in the sensor.
