GE Hydran M2-X Instruction Manual page 58

• Sensor temperature average in ˚C.
• Readings or output of optional I/O #1 to #4.
Navigation is performed as follows:
1. From Short Term History, press Enter to read the date and time of the last event
recorded in the Short Term history file.
2. Press the Up or Down arrow keys to read the date and time of previous or next
recordings.
3. Press Enter and the Up or Down keys to read the value of the variables at the
selected date and time.
3.4.2.2 Long Term History
The Long Term History function gives access to the Long Term history file. From
one to four times per day (adjustable; see parameter Long Term Rate in Setup >
History Setup > History Log Rate [see Section 3.2.6.1]), the date and time plus
several values are stored in this file. Its capacity is 4,760 records (if equipped with
four analog input interfaces); when the file is full, a new record erases the oldest one
in a first in, first out method.
Navigation in this file is performed as in the Short Term history file. The values
recorded in the Long Term history file are also identical. See Section 3.4.2.1.
3.4.2.3 Event History
The Event History function gives access to the Events history file. When an event
occurs, the date and time of occurrence, an event message and several values are
stored in this file. Its capacity is 3,120 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). All event messages and their description are
provided in Appendix H.
The following events are recorded:
• An alarm is triggered.
• An alarm is acknowledged by a user.
• An alarm is cancelled (the alarm condition has disappeared).
• A parameter is changed by a user.
• The date and time are set.
• A new sensor is installed.
• The Hydran M2-X is calibrated.
• A power-up or a shutdown occurs.
• The Hydran M2-X is put in service (first power-up).
• The self-test sequence has failed during power-up.
• The microprocessor is reset by the internal watchdog.
Page 58
Hydran* M2-X Instruction Manual
MA-029 Rev. 1.0, 30-Jul-18