Section 4. Maintenance, Troubleshooting, and Schematics4.1.5 CR1000M ModuleThe CR1000M Module contains a lithium battery that operates the clock andSRAM when the module is not powered. The CR1000M does not draw powerfrom the lithium battery while it is powered by a 12 VDC supply. In an ET107stored at room temperature, the lithium battery should last approximately 10years (less at temperature extremes). Where the ET107 is powered most or allof the time, the lithium cell should last much longer.While powered from an external source, the module measures the voltage ofthe lithium battery daily. This voltage is displayed in the status table. A newbattery will have approximately 3.6 volts. The CR1000 Status Table has a“Lithium Battery” field. This field shows lithium battery voltage.Send the ET107 enclosure to Campbell Scientific to have Campbell Scientificreplace the battery when voltage is approximately 2.7 V. If the lithium cell isremoved or allowed to discharge below the safe level, the ET107 will stilloperate correctly while powered. Without the lithium battery, the clock willreset and data will be lost when power is removed.Campbell Scientific recommends factory replacement ofthe lithium battery. Misuse of the lithium battery orinstalling it improperly can cause severe injury. It is a fire,explosion, and severe burn hazard! Do not recharge,disassemble, heat above 100°C (212°F), solder directly tothe cell, incinerate, nor expose contents to water. Lithiumbatteries need to be disposed of properly.CAUTIONThe lithium battery contained inside of the ET107’s canister is CampbellScientific part number 13519. Table 4.1-1 lists the specifications of thebattery.TABLE 4.1-1. CR1000 Lithium BatterySpecificationsManufacturer TadiranModel TL-59025 (3.6 V)Capacity 1.2 AhSelf-discharge rate 1%/year @ 20°COperating temperature range -55°C to 85°C4-5
