Emerson FB2200 Flow Computer Instruction Manual
D301784X012
March 2019
104 Service and Troubleshooting
5.6 Removing/Replacing the SRAM Battery
A lithium coin cell battery provides backup power for the SRAM and the real time clock. The SRAM
backup battery can last for up to 10,000 hours of cumulative operation, and only runs if the main
power system fails. You do not need to power down the unit to replace the SRAM backup battery.
Important
▪ If the unit is ever powered down without the SRAM battery installed, SRAM data is lost. Always
back up your data before you remove the SRAM battery if you know that main power will also
be off.
▪ Replacement SRAM backup batteries must be Rayovac
®
Model BR2335
EXPLOSION HAZARD: Do not disconnect equipment unless power has been removed or the area
is known to be non-hazardous.
EXPLOSION HAZARD: Do not replace batteries unless power has been switched off or the area is
known to be non-hazardous. Batteries must only be changed in an area known to be non-
hazardous.
1.
Open the enclosure.
2.
Loosen the two captive fastening screws on the cover of the black CPU enclosure (which has
the HMI module attached to it) and place it aside.
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