2. Disconnect the Transmitter Electronics Enclosure security seals (see Figure 3-19),
loosen the end cap security latch (requires a 3 mm Allen wrench) on the terminal
end of the enclosure (see Figure 3-22) and remove the end cap.
3. Use a 1/4 inch standard flat head screw driver and remove the Fuse Holder cap (see
Figure 3-23).
4. Insert the replacement fuse (Littlefuse #218002.HXP) into the Fuse Holder.
5. Install the fuse cap into the holder and push until it is flush with the holder.
6. Turn the fuse cap clockwise 1/8 turn using a 1/4 inch standard flat head screw
driver.
7. If replacing other electronics, continue with Replace Backplane, I.S. Barrier or Power
Supply board, and Acquisition Module replacement before replacing the end caps
and sealing the enclosure.
3.8.3
Replace Backplane, I.S. Barrier or Power Supply board
The following sections detail removal of the Backplane board, the I.S. Barrier Board and the
Power Supply Board.
Backplane replacement
Procedure
1. If replacing the Backplane board, remove power to the meter.
2. Disconnect the Transmitter Electronics Enclosure security seals, loosen the end cap
security latches (3mm Allen wrench required) and remove both end caps (see
Figure 3-25).
3. Remove the CPU Module and the Optional I/O Module (if installed). See Figure 3-23
for board locations and associated terminal blocks.
4. Use a Phillips head screw driver and remove the four Backplane board screws and
captive star washers from the enclosure standoffs.
5. Pull the Backplane board out of the enclosure. This disconnects the I.S. Barrier
Board. Lay the Backplane board down with the Acquisition Cable still attached (the
Power Supply board may remain attached to the Backplane when you remove it
from the enclosure).
Meter repairs Maintenance and Troubleshooting manual
July 2020 3-9000-769
82 Gas Ultrasonic Flow Meters
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