Honeywell 500 - Manual (Page 12)

CLASS 500 ADVANCED KWH/DEMAND METER
62-0304—05 12
MAINTENANCE
The Class 500 Meter unit is shipped in a calibrated and fully functionally tested condition. Since the unit is factory calibrated using
proprietary firmware algorithms, no internal unit adjustments are necessary. This unit contains no internal adjustments. Therefore
no preventative or scheduled maintenance is required, or cleaning or decontamination procedures.
Lithium Battery Replacement Instructions
The Class 500 Meter has a lithium battery cell that is used to retain the contents of SRAM and the RTC during power outages.
The battery has a life expectancy greater than 8 years (See Table 3 for battery specifications).
WARNING
Only replace battery with the exact part number from the manufacturer specified above.
CAUTION
The battery is not completely discharged, therefore DO NOT short the terminals on the battery with any
conductive material.
CAUTION
The internal circuit card components are extremely sensitive to electrostatic discharge. Be careful not to touch
internal circuitry prior to discharging any static build-up on your person. To discharge yourself, touch a
grounded metal object such as a conduit or a metal enclosure exterior.
The battery cell is mounted in a socket on the upper right side of the main power board (See Fig. 13). Should the battery capacity
drop below 2.4 VDC, the display will illuminate a battery symbol on the left margin indicating a low battery. Additionally, the
internal unit firmware will set a flag indicating the low battery condition. When the unit data is next downloaded, the monitoring
facility will be alerted of the low battery and will schedule a service call.
Fig. 13. Location of battery.
Table 3. Battery specifications (25 ºC)
Nominal working voltage 3.5 VDC output
Nominal current capacity: 350 mAHr
Cell chemical: Lithium-thionyl chloride
Operating temperature range: -40 to +95 ºC
Manufacturer: Eagle-Picher
Manufacturer’s part number: LTC-3PN
BATTERY
M28744