Fisher-Rosemount 3095FT, Manual

Page: 115 / 184

5-17
Troubleshooting and Maintenance
BATTERY REPLACEMENT
Replacing the Real-time Clock
Battery The purpose of the Model 3095FT real-time clock battery is to power
the Model 3095FT real-time clock during power failures. When power is
returned, the Model 3095FT real-time clock is still accurate, and there
is no need to reset the clock. With normal use, the real-time clock
battery should last at least seven years.
NOTE
If the real-time clock battery fails, only the logged time-stamp is
affected. Flow calculations and totalizing are unaffected.
An audit trail date of 1-1-70 indicates that the real-time battery failed
during the last power outage. Before replacing the battery, be sure that
the real-time clock battery switch was not set to “OFF.”
Use the following procedure to replace this battery.
1. Perform steps 1 through 3 of the disassembly procedure as
explained on pages 5-10 and 5-11.
2. Remove the real-time clock battery.
3. Insert the new real-time clock battery into the post receptacles.
Be sure to align the battery tab with the captive mounting screw
location.
4. Align the post-receptacle connectors with the posts inside the
electronics housing.
5. Insert the electronics board into the housing and tighten the
captive mounting screws.
6. Replace the electronics housing cover. Each cover must be fully
engaged to comply with explosion-proof requirements.
7. Dispose of the old lithium battery in an environmentally safe
manner.
8. Reset the Model 3095FT clock as described on Page 4-35.
Battery Tab
Captive
Mounting
Screw Location