Emerson Rosemount 3812, Maintenance And Troubleshooting Manual

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7. Install the fuse cap into the holder and push until it is flush with the holder.
8. Turn the fuse cap clockwise 1/8 turn using a 1/4 inch standard flat head screw
driver.
9. Connect to the meter with MeterLink. Open the Meter Monitor (Detailed) view and
verify the meter is acquiring data, the transducers have good signals and flow
profiles for the chords are displayed and run the Zero Flow Calibration Wizard;
select the
Calibrate
→
Zero Calibrate menu and generate the report. Then, collect
and save a Maintenance log to show the “as left” condition of the meter. Or use
AMS
™
Device Manager or a HART
®
Field Communicator and select Overview
→
Zero Calibration
→
Start
menu or
Service Tools
→
Maintenance
→
Zero
Calibration
→
Start .
10. Close your application connection (MeterLink, AMS
™
Device Manager or HART
®
Field Communicator).
11. If replacing other electronics, continue with Replace the Backplane , Replace the I.S.
Barrier board , Replace the Power Supply Board or Replace the Acquisition Module
for direct or remote mount electronics before installing the end caps and sealing
the enclosure If you are not replacing other electronics, replace the end caps and
security latches (3 mm Allen wrench required). and if required, install the security
wire seals (see
Seal direct or remote mount transmitter electronics enclosure ).
12. If you are not replacing other electronics, replace the end caps and security latches
(requires a 3 mm Allen wrench). If required, install the security seals through the
hex bolts in the Junction box cover (see
Seal the Junction Box for remote mount
electronics option ).
This completes the fuse replacement procedure.
3.9.3 Replace the Backplane
Procedure
1. If replacing the Backplane board, remove power to the meter.
2. Refer to
Table 3-9 for the tools required to complete this procedure.
3. Disconnect the Transmitter Electronics Enclosure security seals (see Figure 3-78 ),
loosen the end cap security latches (3mm Allen wrench required, see Figure 3-56 )
and remove both end caps.
4. Remove the CPU Module and the Optional I/O Module. See Figure 3-57 for board
locations and associated terminal blocks.
5. Use a Phillips head screw driver and remove the four Backplane board screws and
captive star washers from the enclosure standoffs.
6. 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).
Maintenance and Troubleshooting Manual Meter maintenance
00809-0100-3812 April 2022
Rosemount 3812 Liquid Ultrasonic Flow Meter 95