Rosemount 3051SFC_A - User Manual

Questions and Answers

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Emma AvilaAug 12, 2025
Why do Rosemount 3051SFC_A Measuring Instruments give a high reading?
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  Selena RobertsAug 12, 2025
  If your Rosemount Measuring Instruments are showing a high reading, here are a couple of things to check: * The Annubar sensor might not be installed in the proper pipe size. To resolve this, verify the actual pipe ID and wall dimensions and compare them to the Calculation Data Sheet. If the dimensions do not match, consult the factory. * The DP transmitter might not be zeroed or configured correctly. You should verify that the DP sensor has been zeroed properly, that the transmitter range is correct, and that the square root output is correct. Also, verify that the Annubar sensor calc sheet represents fluid density properly so that the transmitter is configured correctly for the application.
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Gary AcostaAug 22, 2025
What to do if the Annubar sensor won't fit in the drilled hole in Rosemount Measuring Instruments?
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  nobleanthonyAug 22, 2025
  If the Annubar sensor won't fit in the drilled hole for your Rosemount Measuring Instruments, here's what to investigate: * The drill hole might not be the proper size. Verify that the drill hole matches the size specified in the installation instructions. Re-drill the mounting hole with the proper drill hole size. * The drill hole might not be aligned properly with the Annubar sensor mounting hardware. Verify that the mounting hardware is centered over the pipe hole. If necessary, reinstall the mounting hardware. * The hole might have been torch-cut, leaving pipe fragments blocking the hole. Re-drill the hole in a different location as specified in the installation instructions.
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Morgan BrownNov 1, 2025
Why are my Rosemount 3051SFC_A showing a low reading?
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  Thomas GarciaNov 1, 2025
  If your Rosemount Measuring Instruments are showing a low reading, several factors could be at play: * The Annubar sensor might not be fully installed, failing to span the pipe's inner diameter. In this case, verify the pipe's ID and wall dimensions against the Calculation Data Sheet, and consult the factory if they don't match. During re-installation, mark the tip of the Annubar sensor, install, remove, and inspect the marking to ensure it contacts the opposite side of the pipe. * The sensor might not be aligned properly in the flow profile. Refer to the installation instructions for correct alignment straight across the pipe I.D., ensuring the upstream sensing holes face directly upstream in the flow profile. * The sensor could be installed in the wrong pipe size. Again, verify th...
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Jennifer LivingstonNov 6, 2025
What to do if Rosemount 3051SFC_A show erratic signal/ negative reading/ no reading?
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  Leah AndersonNov 6, 2025
  If you're getting an erratic signal, negative reading, or no reading at all from your Rosemount Measuring Instruments, consider these possibilities: * The Annubar sensor might be installed backward. Check that the flow arrow on the instrument connections points in the direction of flow. * The sensor could be broken or missing. Remove it to verify that the sensing element is intact and undamaged. * Instrument valves might be closed. Ensure both high and low instrument valves are open. * The flowmeter might be too close to a flow disturbance. Verify the installation against recommended distances in the Installation section. * Air might be trapped in the instrument impulse lines (for liquid applications). Reinstall the lines to eliminate high points where air can collect. * There...
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Sheila PatelNov 16, 2025
What causes the Annubar sensor to be too long or too short in Rosemount Measuring Instruments?
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  Robin MccartyNov 16, 2025
  If the Annubar sensor appears too long or too short for your Rosemount Measuring Instruments, consider the following: * The pipe dimensions might not have been properly supplied. Verify the actual pipe ID and wall dimensions and compare them to the Calculation Data Sheet. Consult the factory if the dimensions do not match. * The mounting hardware supplied might not be the correct length. Check the mounting height and compare it to the dimensions shown in the Dimensional Drawings. Consult the factory if the dimensions do not match. * If the Annubar sensor looks too long (Pak-lok or Flange-lok Models), verify the actual pipe ID and wall dimensions and compare them to the Calculation Data Sheet. Consult the factory if the dimensions do not match. Also, review the installation instructi...
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michael51Nov 26, 2025
How to fix severe vibration of the sensor in Rosemount 3051SFC_A Measuring Instruments?
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  Jacob NelsonNov 26, 2025
  If you're experiencing severe vibration of the sensor in your Rosemount Measuring Instruments, here are a few things to check: * The Annubar sensor might not be properly sized for the application. Verify that the process conditions on the Calculation Data Sheet are accurate. Consult the factory if process conditions have changed. * The tip of the Annubar Flowmeter might not be properly bottomed for Pak-lok, Flange-lok, or Flo-tap Models. For Flo-tap models, turn the crank handle until the sensor is bottomed per the installation instructions. For Pak-lok and Flange-lok models, tighten the nuts per the installation instructions. * There might be excessive pipe vibration. Check the vibration on the pipe and install additional supports for the Annubar sensor if necessary. Consult the fa...

Summary

Section 2 Installation

2.1 Safety messages

Crucial safety precautions for installation, including warnings and cautions.

2.4 Installation flowchart and checklist

A step-by-step installation guide and checklist for verifying critical steps.

2.6 Installation Procedures

Detailed installation procedures for various Annubar sensor types.

2.7 Wire the transmitter

Instructions for transmitter wiring, including precautions for moisture and transient protection.

Section 3 Commissioning

3.1 Safety messages

Safety precautions for commissioning operations, emphasizing hazardous environment handling.

3.2 Transmitter commissioning

Guidance on transmitter commissioning, referring to specific manuals for wiring and configuration.

3.3 Commissioning the Annubar sensor

Procedures for commissioning the Annubar sensor, including transmitter preparation and calibration.

Section 4 Operation and Maintenance

4.1 Safety messages

Safety precautions for operations and maintenance, highlighting hazards with warning symbols.

Section 5 Troubleshooting

5.1 Basic troubleshooting

Guide to diagnosing and resolving flowmeter malfunctions by checking hardware and connections.

Appendix A: Specifications and Reference Data

A.3 3051 SF specifications

Comprehensive specifications for the Rosemount 3051SF series: performance, functional, and physical.

A.6 3051 CF specifications

Specifications for the Rosemount 3051CF series: performance, functional, and physical.

A.9 2051 CF specifications

A.11 485 specifications

A.13 585 specifications

A.15 405 Specifications

Appendix B: Product Certifications

B.1 Hazardous Locations Installations

Information on explosion-proof housings and circuitry for intrinsically safe and non-incendive operation.

B.2 Rosemount 3051 SFA and 3051 SFC_A

B.3 Rosemount 2051 CFA and 3051 CFC_A

B.4 Rosemount 2051 CFA and 2051 CFC_A

Rosemount 3051SFC_A Specifications

General

Model	3051SFC_A
Manufacturer	Rosemount
Process Temperature	-40 to 85°C (-40 to 185°F)
Temperature Range	-40 to 85°C (-40 to 185°F)
Rangeability	100:1
Product Type	Flow Meter
Measurement Range	Varies by configuration
Flow Rate	Varies by configuration
Output	4-20 mA HART
Process Connection	Flanged
Environmental Rating	IP67
Certifications	ATEX, IECEx, FM, CSA