Removing/Replacing The Sram Battery - Emerson FB1200 Instruction Manual

Emerson FB1200 Flow Computer Instruction Manual
D301782X012
March 2019
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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.
Important
Replacement SRAM backup batteries must be Rayovac® Model BR2335.
DANGER
Ensure the flow computer is in a non-hazardous area. Never remove end caps in a hazardous area.
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Figure 5-5: Removing the Battery Pack
Connect the new battery to the open connector. Route the wires so they are in the recessed
area. Make sure the wires won't get caught in the end cap threads.
Disconnect the old battery pack's connector from the unit and set the old battery pack aside.
Slide the new battery pack into the unit.
Loosen the top captive fastening screws on the HMI module to separate it from the old
battery pack.
Align the HMI module with the new battery pack and the tab on the CPU carrier board
(bezel). Gently press the assembly on, being careful not to pinch the battery wires.
Tighten all four screws.
Replace the front end cap. Screw the end cap clockwise (eight full turns) until it is tightly
sealed to the enclosure. Replace the retaining clamp, if applicable (see Section 2.6.1).
Service and Troubleshooting