Navigation in this file is performed as in the Short Term history file. The values
recorded in the Events history file are the same as the ones recorded in the Short
Term file. See Section 3.4.2.1.
3.4.2.4 Service History
The Service History function gives access to the Service history file.
The Hydran M2-X performs a self test of its sensor on the first and fifteenth days
of each month at midnight (fixed logging rate, non adjustable). After each test, the
date and time of the test plus several variables are recorded in the Service history
file. Its capacity is 1,470 records (if equipped with four analog input interfaces); when
the file is full and a new recording occurs, the oldest recording is deleted (first in, first
out method). The Service history file may be required for maintenance or trouble
shooting purposes.
Navigation in this file is performed as in the Short Term history file. The values
recorded in the Service history file are the same as the ones recorded in the Short
Term file. See Section 3.4.2.1.
3.4.2.5 Alarm History
Navigation in this file is performed as in the Short Term history file. The values
recorded in the Service history file are the same as the ones recorded in the Short
Term file. See Section 3.4.2.1.
3.4.3 Date & Time
This function is identical to the one in Setup > Date & Time. See Section 3.2.2.
3.5 Test Menu
3.5.1 Sensor Test
The Sensor Test function is an internal diagnostic test that is initiated
automatically for approximately 5 seconds, twice per month (on the 1st and 15th) to
characterise the sensor performance. Upon completion of the test, the internal
sensor test results will automatically update and are stored in the unit’s Service
history files.
If the internal sensor signal is within optimal range, the display on the M2-X will
show Good, indicating that the sensor is operating as expected. No message will be
recorded in the Events history file.
If the internal sensor signal is no longer optimal, the M2-X will trigger a sensor
alarm indicating that there is an issue with the sensor and the corresponding alarm
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