Emerson Rosemount 3812 Programming manual

Maintenance and Troubleshooting Manual
00809-0100-3812, Rev AA
April 2022
Rosemount™ 3812 Liquid Ultrasonic Flow
Meters
for Direct or Remote Mount Meter Electronics

Safety and approval information
This Rosemount product complies with all applicable European directives when properly installed in accordance with the
instructions in this manual. Refer to the EU declaration of conformity for directives that apply to this product. The EU declaration
of conformity, with all applicable European directives, and the complete ATEX Installation Drawings and Instructions are available
on the internet at www.emerson.com or through your local Emerson support center.
Information affixed to equipment that complies with the Pressure Equipment Directive, can be found on the internet at http://
www.emerson.com.
For hazardous installations in Europe, refer to standard EN 60079-14 if national standards do not apply.
Other information
Full product specifications can be found in the product data sheet. Troubleshooting information can be found in the user manual.
Product data sheets and manuals are available from the Emerson website at http://www.emerson.com.
Return policy
Follow Emerson procedures when returning equipment. These procedures ensure legal compliance with government
transportation agencies and help provide a safe working environment for Emerson employees. Emerson will not accept your
returned equipment if you fail to follow Emerson procedures. Return procedures and forms are available on our web support site
at Emerson.com, or by phoning the Emerson Customer Service department.
Emerson Flow customer service
Email:
•Worldwide: http://[email protected]
•Asia-Pacific: http://[email protected]
Telephone:
North and South America Europe and Middle East Asia Pacific
United States 800 522 6277 U.K. 0870 240 1978 Australia 800 158 727
Canada [phone] The Netherlands [phone] New Zealand 099 128 804
Mexico [phone] France 0800 917 901 India 800 440 1468
Argentina [phone] Germany 0800 182 5347 Pakistan 888 550 2682
Brazil [phone] Italy 8008 77334 China [phone]
Central & Eastern [phone] Japan [phone]
Russia/CIS [phone] South Korea [phone]
Egypt 0800 000 0015 Singapore [phone]
Oman 800 70101 Thailand 001 800 441 6426
Qatar 431 0044 Malaysia 800 814 008
Kuwait 663 299 01
South Africa 800 991 390
Saudi Arabia 800 844 9564
UAE 800 0444 0684
2

Contents
Chapter 1 Routine Maintenance.................................................................................................5
1.1 Meter maintenance..................................................................................................................... 5
1.2 Field hydrostatic pressure testing procedures..............................................................................6
1.3 Routine maintenance.................................................................................................................. 7
Chapter 2 Troubleshooting...................................................................................................... 13
2.1 Meter status alarms................................................................................................................... 13
2.2 Troubleshooting the meter........................................................................................................16
2.3 Troubleshoot Maintenance log files and trend files.................................................................... 31
Chapter 3 Meter maintenance..................................................................................................37
3.1 General maintenance tasks........................................................................................................37
3.2 Important safety information.....................................................................................................38
3.3 3812 meter options................................................................................................................... 40
3.4 Remove the shrouds.................................................................................................................. 43
3.5 Re-wet the transducers..............................................................................................................52
3.6 Transducer housings or housing seals replacement................................................................... 56
3.7 Transducers replacement.......................................................................................................... 62
3.8 Meter electronics replacement.................................................................................................. 90
3.9 Transmitter electronics maintenance........................................................................................ 91
3.10 Shrouds installation............................................................................................................... 106
3.11 Meter sealing.........................................................................................................................117
Appendix A Conversion factors................................................................................................. 127
A.1 Conversion factors per units of measurement......................................................................... 127
A.2 K-Factor and inverse K-Factor.................................................................................................. 128
Appendix B Engineering drawings............................................................................................ 129
B.1 Rosemount 3812 Liquid Ultrasonic Flow Meter drawings.........................................................129
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Contents Maintenance and Troubleshooting Manual
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1 Routine Maintenance
1.1 Meter maintenance
This section includes discussion of the maintenance of Rosemount 3812 Series Ultrasonic
Meters.
For reference, you may download the MeterLink Quick Start Manual from:
http://www2.emersonprocess.com/en-US/brands/Flow/ultrasonics/Pages/Ultrasonic.aspx
MeterLink may be downloaded at no charge from:
https://www.emerson.com/en-us/catalog/rosemount-sku-meterlink-diagnostics-
software
CAUTION
SURFACE TEMPERATURE HAZARD
Meter body and piping may be extremely hot or cold.
Wear appropriate personal protective equipment when coming in contact with the meter.
Failure to comply may result in injury.
CAUTION
TRANSPORTATION HAZARD
When moving the meter, do not insert the forks of a forklift into the bore.
Inserting the forks may cause the meter to become unstable, resulting in injury to
personnel or damage to the bore and sealing face.
WARNING
CRUSHING HAZARD
During meter installation or removal, always place the unit on a stable platform or surface
that supports its assembled weight.
Failure to comply can cause the meter to roll, resulting in serious injury or equipment
damage.
CAUTION
TRIPPING HAZARD
Clear all obstacles or obstructions from the work area when transporting, installing or
removing the meter.
Failure to comply may cause injury to personnel.
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Rosemount 3812 Liquid Ultrasonic Flow Meter 5

CAUTION
ESCAPING FLUIDS HAZARD
The purchaser of the meter is responsible for the selection of Emerson components/seals
and materials compatible with the chemical properties of the measurement fluid.
Failure to select suitable meter components/seals may cause escaping fluids, resulting in
injury to personnel or equipment damage.
Consult your Emerson Sales and Service representative to ensure you purchase the correct
components and seals for your application, below safety message.
1.2 Field hydrostatic pressure testing procedures
The Rosemount 3812 Liquid Ultrasonic Flow Meter can be field hydrostatic tested without
any special preparations or disassembly. The transducers are not exposed to the process
pressure and can remain installed in the meter.
The liquid ultrasonic meter pressure containing parts include, but are not limited to the
transducer housings. The Hydrostatic test is verification of the pressure containing
capability of the liquid ultrasonic meter pressure containing parts and seals. Each
Rosemount Liquid Ultrasonic Flow Meter is successfully hydrostatic pressure tested prior
to shipping from the factory.
The maximum field hydrostatic pressure test must be limited to 1.5 times the stamped
maximum working pressure. The maximum working pressure is stamped on the meter ID
tag.
CAUTION
LEAKAGE OR PRESSURE CONTAINING PARTS FAILURE
Use precautions to eliminate hazards to personnel in the event of leakage or failure of the
liquid ultrasonic meter pressure containing parts or failure of the test equipment and to
prevent over-pressurization during the test procedure.
Failure to comply may result in injury to personnel or cause damage to the equipment.
NOTICE
A copy of this test is available by contacting Emerson Customer Support. Please provide
the body serial number when requesting a copy of the test report. The body serial number
is located on the downstream flange to the left of the hoist ring hole (when looking at the
flange face).
Emerson Customer Support contact information is located on the back page of the
manual.
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1.3 Routine maintenance
Routine maintenance operations requires adherence to all applicable regulations and laws
and safety training for personnel to perform the maintenance operations. Review your
organization’s best practices procedures before performing routine maintenance.
1.3.1 Maintenance logs and reports
To monitor the performance health of the meter, and ensure it is operating within
acceptable specifications, routine diagnostics should be performed. Collecting a
maintenance log gives you a snapshot of the current health of the meter and you can
compare the inspection reports from previously saved logs. Use the Logs/Reports menu
and click Maintenance Logs and Reports. MeterLink displays the Maintenance Logs and
Reports dialog. Choose the time duration, log format and collection rate for the output file
and click the Start button. You can open the file immediately after it is generated or view it
at a later time. It is recommended that a Maintenance log be collected after an upset in
the system.
In establishing a baseline to be used for the trending of the meter diagnostics, it is very
helpful if a set of log files are collected immediately after the meter has been installed in
the field. Preferably, collect the log files at several velocities within the operating range of
the meter. This helps establish that the flow profile is relatively constant throughout the
meters operating range (except velocities below 3 ft/sec where the profile may vary).
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Rosemount 3812 Liquid Ultrasonic Flow Meter 7

Maintenance log collection
Figure 1-1: Maintenance log collection parameters
Trend maintenance log collection
Merging the results of two or more Maintenance logs into a single file, allows you to build
a historical database of the meter’s performance. Trending the logs indicates changes
from the original installation of the meter, or over time. Looking at a single inspection
report, that is either collected monthly or quarterly, can give you an indication of the
meter's health.
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Figure 1-2: Trend log collection
This is important since many diagnostics change slowly over time. Trending the
maintenance logs helps identify these changes and makes problems much more obvious
than merely viewing a single inspection report. The Trending feature is integral to
MeterLink which allows all important parameters to be trended. MeterLink supports
trending files in a Microsoft® Excel® workbook from multiple 3812 meter maintenance
logs. Some parameters like gain, signal level, and noise level may show a shift over time
which can be useful in detecting changes in the meter and the installation.
Maintenance logs or Trend files to be trended must all have matching column headings.
This means the logs must be in the same units (i.e. U.S. Customary or Metric), must have
the same pressure type (i.e. gauge or absolute), and must have the same time base (1/
second, 1/minute, 1/hour, 1/day). If not, an error message will be displayed stating the
column headings do not match and the file will not be added to the Workbook to trend
list.
Archive log collection
Archive logs that may be collected and the options include:
•Daily log - generated every 24 hours on the Contract Hour
•Hourly log - generated every hour at the top of the hour
•Event log - collects the alarm and event log records
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Rosemount 3812 Liquid Ultrasonic Flow Meter 9

Figure 1-3: Archive log collection parameters
The logs may be collected in a single file or you can choose to collect one type of log. Each
of the Meter Archive logs include the Meter Configuration file.
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