5. Expansion port: Not used. This is used in Hydran S2 only.
Figure 2-6: Left Side of the Electronic Card Cage
2.3.4 Inside
The electronic card cage contains the circuit boards (CPU, sensor card, etc.) and
the battery.
2.3.4.1 Battery
The Hydran M2-X’s battery is used to keep the real-time clock functioning and to
retain the parameter values and data of the history files when the ac power is not
available. For the specifications, see Section 9.3; should you need to replace the
battery, see Appendix G.
2.3.4.2 Internal Real Time Clock
An internal real-time clock (RTC) provides a calendar and a permanent clock,
unless the battery is disconnected. The clock uses a crystal oscillator as its time
base; its 0.01 % accuracy (four minutes per month) is independent of the ac power
supply frequency. The calendar accounts automatically for leap years (366-day
year).
To set the Hydran M2-X’s date and time, see Section 3.4.3.
The Hydran M2-X’s internal clock manages the following functions:
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