Teledyne 9060 - Zirconium oxide flue gas oxygen analyzer - Manual (Page 25)

9060-Zirconia Analyser
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2.15 BACK-UP BATTERY
The transmitter’s RAM and real-time clock are backed up by a lithium battery in the event
of power failure. All set-up variables are saved and the clock is kept running for
approximately ten years with the power off. The battery module should be replaced every
8 years. (It is the battery shaped device clipped in a socket labelled M1.)