Flow Forum - Recent Threads

Suspected production shortfall linked to test separator

okpako — Tue, 30 Jun 2026 09:08:24 GMT

Hi, we are getting some issues with our well tests. After testing some wells, results are bad.

The issue is the density measurement- (going below reference density of Oil) and that is impacting WC calculations.

Typically, Coriolis (CMF300) showing density below oil reference as highlighted below usually indicates entrained gas and or process upset.

Coriolis meter has been certified by external ISO lab and found to be in working condition.

what do you guys think?

Inputs/discussions on this would be most welcome.

Regards

Okpako

2700 Tx to 5700 Tx upgrade/change out error message " device description"

okpako — Mon, 15 Jun 2026 05:50:23 GMT

HI Team,

In replacing a 2700 series transmitter with a newer 5700 series on a micromotion CMF300 Coriolis, we are unable to upload the same existing setpoints on the existing 2700 transmitter into the newly procured 5700 transmitters. we get an error message "device description".

Kindly advise what to do or support with step-by-step procedure to address this issue.

Regards

Okpako

[026 - Sensor Comm. Fail] alarm persist days after replacing 2700 with 5700 on a CMF300M356NABZEZZZ

okpako — Fri, 27 Feb 2026 21:20:05 GMT

Hi Team,

We encountered frequent alarms on a CMF300 with a recently replaced TX from 2700 series to a more modern 5700 series.

It was reported that weeks before the transmitter replacements on the CMF300 sensor, this alarm was long observed and not acknowledged.

However, after the replacement of the 2700 transmitter with a 5700 transmitter on the same CMF300, the alarm error message was found to still persists. [026 - Sensor Comm. Fail]

On recycle and power on, the core processor LED remains OFF instead of being ON.

it appears the coriolis sensor is not communicating with the transmitter.

Further troubleshooting showed communication from the transmitter to SCADA is okay.

Simulation results are also good.

My Suspicion is on the core processor which i think could be faulty. what do you guys think?

Advice if this issue is only about the core processor which needs to be replaced.

Flow application - Annubar Flowmeter 3051CFA - Guidance for Configuration and Field Calibration

THALES CAMARGO 105 — Fri, 05 Dec 2025 14:41:03 GMT

Team,

Many thanks in advance for your valuable feedback. We have many flowmeters already installed in Anti-surge Loop for Centrifugal Compressor (installed at suction side).

Before ordering these flowmeter, Process conditions (Flow rates, pressure and temperature had been delivered to manufacturer). Besides that, Fluid data also has been shared to manufacturer like: Fluid type, Density at operating base, Specific gravity, Compressibility at operating base, Molecular Weight, Isentropic exponent, Operating viscosity.

In summary, flowmeters are selected according to Engineering design.

Annubar Flowmeter: 3051CFADG300ZCHFS3A3D0072AA1P1V1V2QC7Q8J3G2

Related to Annubar hardware assembly information:

Flowmeter and meter type: 3051CFA - Annubar flowmeter flanged with opposite side support

Sensor size and material: 3 - 316 stainless steel

Line size: 750 mm (30 in) - Schedule: XS - Material: Carbon Steel (A105)

ID (span): 736.6 mm - Wall: 12.7 mm

Pipe orientation: Horizontal

Connection type: 300#RF ASME B16.5

Mounting type and material: 300#RF ASME B16.5

My Questions are focused on configuration and field calibration or verification:

What are the main considerations to properly configure this flowmeter? Do I should set up the pipe diameter, pipe wall and flow type (methane gas) in the flowmeter configuration?

What tool is needed to configure the flowmeter? At site we have the Trex communicator and realized that basic configuration has been seen and retrieved. Is this the only option or is there a software tool that can be used to configure this flowmeter and have the chance to see more technical information related to the Primary element (Annubar) as well?

How do we know if the Annubar sensing ports are starting to clog?

470XA connecting through RS232 port of FB107

greeshma — Mon, 24 Feb 2025 10:53:04 GMT

I am trying to connect 470XA with FB107 through RS232. How to map registers and what will FB107 will read when GC goes to calibration mode?

Emerosn 3418 Ultrasonic Flow Meters failing AGA 9 Test?

Shaiq Bashir — Wed, 02 Oct 2024 19:08:36 GMT

Dears

We carried out the dry calibration factory test of 3418, 8 path 24 inch ultrasonic flow meter and attached are the results of its zero flow verification by individual paths. As per AGA 9 2022, section 4.6.3, the individual path gas velocity shall not be greater than 0.02 ft/sec. Here as can be seen that two paths are outside this limit. What can be done when we have a situation like this?

FlowBossS600+ Modbus Mapping

Moazzam Ali — Tue, 20 Aug 2024 11:49:22 GMT

I'm working on extracting Modbus addresses from an S600+ Flow Computer's 'mbslave.txt' file provided by the client. Unfortunately, I lack the S600config software to open the corresponding '.cfg' file. Given my experience with flow computers and their software, I'm struggling to interpret the Modbus addresses in the 'mbslave.txt' file. I've attached both the 'mbslave.txt' and '.cfg' files for reference. Any guidance on extracting the necessary Modbus addresses would be greatly appreciated.

Thanks

https://drive.google.com/drive/folders/1sr35BYU8lXU0Epohy55le1TnFxrnb6JA?usp=drive_link

CMF300+ increase mass totalizers but not volume

Rogelio Villar — Mon, 05 Aug 2024 13:40:29 GMT

Hi, we have a CMF300+ installed an oil+water stream and after a flowmeter calibration provided by a third party contractor the flowmetter won't increase volumen totalizers (inventory or partial totalizer).

We have a mass flowrate, volume flow rate, mass totalizers increase according to flow rate but volume totalizers and inventory are fixed with 0 value.

Did anyone had this problem? Is there a parameter that could cause this behaviour?

Thanks

Rogelio

Mismatch between Flow transmitter and flow element parameter

abdulrahman mahmood faihan — Mon, 25 Sep 2023 08:54:52 GMT

Dear Sirs

We have DP flowmeter installed on hydrogen compressor suction line with Venturi-Welded flow element and 3051 DP XMTR.

The range of flow element as below:-

max Flow Rate: 30000 nm3/h

max Diff. Pressure: 1500 mm/H2o

Same parameters used in flow transmitter and control system but unfortunately after start-up we found this range is not enough for the process and the transmitter went over range before full load.

My question can we increase the flow rate to 40000 and max diff pressure to 2000 from flow transmitter and control system without changing the flow element and get correct reading?

Coriolis Process Temperature Effect

Shaiq Bashir — Mon, 19 Jun 2023 05:45:08 GMT

Dear All

I need some help in estimating the temperature effect on the overall uncertainty of the Emerson Coriolis meter. In the datasheet, under the title of "Temperature Measurement", it says the following:

Temperature is a measured variable that is available as an output. The temperature is also used internal to the sensor to compensate for temperature influences on Young’s Modulus of Elasticity.

Then it defines the accuracy associated with this temperature sensor under the title of "Accuracy and repeatability on temperature".

It then tells us the "Process Temperature Effect" on mass flow accuracy under the title "Process Temperature Effect". It is also stated that if the meter is zeroed at operating condition, then this effect can be zero.

Now imagine that the process temperature is varying over a certain range, it means that the temperature effect has to be considered. Also, the temperature sensor used to calculate the difference between operating and calibration temperature will be the integrated temperature sensor, therefore, its uncertainty should also be considered as mentioned under the heading of "Accuracy and repeatability on temperature".

But surprisingly, in AGA 11, we do not see the temperature effect as a valid uncertainty contributor in Coriolis mass flow. Why do you think its like that?

Rosemount 8732 mag flow meter how to fix error "Analog output fixed"

Cliff Nichols — Tue, 13 Jun 2023 13:59:37 GMT

I started getting an alarm two days ago on the display Output at 4 mA and elsewhere Analog output fixed. On the remote device to where the analog goes, it reads 0 flow. On the flowmeter locally, it reads correctly at approximately 2200 GPM

How can this be repaired?

Connecting Micromotion Coriolis Meter RFT9712 to Prolink III (RS485)

CoriolisJohn — Fri, 23 Sep 2022 10:28:49 GMT

Transmitter: RFT9712 without display

The density output of the flowmeter is stuck at 21 or 22mA regardless of the liquid flowing through the measurement tube. The flow output seems to work normally though. It could indicate an mA output saturation maybe but it not seem to be a critical alert present yet, as LED blinks 1 Hz interval

Emerson support recommended trying to troubleshoot by connecting the transmitter to Prolink III. The transmitter supports Hart RS485 when the jumper wire in the transmission board is set to RS485.

I tried using the Connection Wizard in Prolink III but it would not let me link the RFT9712 device to the RS485 to USB converter. (See attached image)

The other devices did on the other hand let me drag a connection line between the device, converter and COM port.

Pipe ID Difference with respect to AGA 9 Requirements (Ultrasonic Flow meters)

Shaiq Bashir — Fri, 22 Jul 2022 04:59:18 GMT

We are facing one technical issue regarding compliance of AGA 9.

We are trying to get a 24" USM flow calibrated from an external calibration lab. Our existing pipe in the plant is 24" sch60. But that lab does not have the same upstream and downstream pipe spools. They have 24" sch40. So, there will be a 2.5% pipe id difference between calibration and actual field installation. As per AGA-9 Clause#7.2.3, such differences should be within 1%.

Is there any way we can work around this problem? I understand that there will be impact on the calibration uncertainty due to this difference. What do you say?

Support on Coriolis Mass Flow meter

Prithvisaran — Thu, 21 Jul 2022 07:02:29 GMT

Model: CMF025M320N0A2EZZZ

Transmitter: 2400SIA11B2EZZZ which gives 4-20mA output.

I am using above Corriolis mass flow meter for R410A refrigerant flow measurement.

Flowmeter is connected in-between the liquid line between Condenser outlet and Evaporator Inlet.

Condenser ------ Flowmeter ------ Evaporator. (/resized-image/__size/304x406/__key/communityserver-discussions-components-files/39/MicrosoftTeams_2D00_image-_2800_13_2900_.png

Observed that my Condenser outlet pressure is constant when Unit is operated in steady state condition , Flow meter values are varying by 4.5% of range and the Evaporator inlet pressure also varying continuously.

Pressure drop between Condenser outlet and Evaporator inlet pressure is 10Psia.

We have installed a sight glass before flow meter which is indicates clear refrigerant flow without any bubbles.

Other Observations:

Initial Status light of flowmeter is Amber before unit is turned on and showing negative flow in the display -2 to -3 lb/min
Once unit starts Status light changes to Green.
Unit is running and when it is turned off status light is green and there is no amber light flashing. Also flow is 0lb/min.
After some time unit is turned off , approx. one hour status light changes to amber and flow is again showing negative in the display.

Also found the other pressures of our air conditioning systems are constant in steady state except evaporator inlet pressure i.e. Flowmeter outlet pressure

Could you please suggest what are all the mounting and other precautions has to be done while installing Coriolis mass flow meter in our setup

Micro motion ELITE Coriolis back flush recommended procedure

Faiz Faiz — Wed, 05 Jan 2022 09:51:40 GMT

Dear Expert,

Perform SMV and monitor Drive Gain reading are one of method to make sure there is no sign of deposit, particle, or coating on coriolis tube. CMIIW.

Apart of that, we want to maintain the coriolis tube by performing back flush as part of our maintenance procedure.

- Is there any recommended practice or procedure on how to perform back flush on Coriolis Tube?,

- Is there any required solvent to be used along during flushing?,

Thank you in advance,

Regards,

Faiz

Configuration of key macros in DeltaV Live (v14.LTS)

Stefan Muellner — Fri, 10 Dec 2021 07:55:04 GMT

Ladies and Gentlemen.

In DeltaV Operate our operators are used to press function keys for fast responses to different events:

e.g.:

"F12" ... silence the horn

"F10" ... acknowledge the last alarm

"F4" ... to open an overview picture

...

These actions were configured inside the Key Macro Editor of DeltaV Operate - nice feature by the way.

So, again, my questions would be: is this possibility also given by DeltaV Live?

Thanks for your attention. I’m looking forward to your reply.

brg Stefan

Support on CMF050 Flow meter and Transmitter: 2400SIA11B2EZZZ which gives 4-20mA output.

Prithvisaran — Fri, 10 Dec 2021 06:58:39 GMT

Got CMF050 Flowmeter for Refrigerant flow measurement.

Model: CMF050M320N0A2EZZZ

Transmitter: 2400SIA11B2EZZZ which gives 4-20mA output.

Measuring range of the sensor – 0-57.6 kg/min.

Given transmitter 24VDC power supply to L1 & L2 and have taken current output from CHA + and – of the transmitter

For initial commissioning, We used a water pump which is giving a constant flow of 13-14 kg/min approx.

At Flow meter display flowrate is shown as 13.2kg/min, whereas the current output is 5.44mA, which corresponds to 5.13Kg/min.

Hence there is difference between the display and current output by the transmitter.

Also we observed that the density of fluid (Water) changes with the change in flowrate.

Answers welcome to solve this issue.

Orifice Plate Pressure Ratio

Shaiq Bashir — Sun, 09 May 2021 09:40:55 GMT

In ISO 5167 standard, in the equation for calculating expansion factor, it considers a parameter called P2/P1 which it calls as "Pressure Ratio" for orifices. The description is given as the ratio of absolute static pressure at downstream tap to absolute static pressure at upstream tap.

Can someone help me please with how to calculate this pressure ratio for orifice (P2/P1)?

Thanks in advance.

Regards

Density Measurement in 3051SMV Multivariable Transmitter

Shaiq Bashir — Wed, 05 May 2021 16:44:13 GMT

I would like to know that for a Natural Gas application, how a 3051SMV Multivariable transmitter can measure the density? I could not find a way to feed the live gas composition to this transmitter, then why it is marketed as a a fully compensated mass flow transmitter that can consider all the factors in the AGA 3 flow equation including density?

Regards

Magnetic Flow Sensor 8721 Ambient Temperature Effect

Shaiq Bashir — Sat, 24 Apr 2021 06:09:05 GMT

I was going through the datasheet of Emerson Magnetic Flow meters and came across the performance specifications of 8721 Sensor. It says as following:

Ambient temperature effect: ±0.25% change over operating temperature range

So, in order to calculate the impact of ambient temperature, we need to know what is the reference ambient temperature on Emerson side. So, what I think I have to subtract that reference ambient temperature from my site ambient temperature and multiply it with 0.25%. Can you please confirm this? Can you please also provide reference ambient temperature on your end.

CMF200 with Transmitter 1700I cable

TEJAS JADWANI — Tue, 13 Apr 2021 09:19:40 GMT

Hello,

We have CM sensor CMF200A420NCAAEZZX_20312MCREHTWGSPPK with Tx 1700I13ABAEZZZ
This is supplied for high temp. with flex cond. cable of 4ft to connect the CM sensor with its Tx.

Upon checking at site condition, we required the bigger cable length, however while checking with Emerson team, surprisingly the bigger cable is not possible and we required to purchase complete new sensor with its transmitter.

That's sound strange that for one cable complete unit need to be re-purchased?

Could you please explain in detail?

Regards,

Tejas

Coriolis CFM200 .

Alfacesar2025 — Wed, 07 Apr 2021 09:29:43 GMT

Dear all;

We are using CFM 200 Coriolis Meter connected to our DCS System via modbus. We are suspecting the measured values reported by the Coriolis meter.

We read the Alert: A103: Data Loss Possible when we connect to the device with Prolink III Basic Software.

1. How do we clear the above alarm

2. Is there a possibility to run the Smart Meter Verification (SMV) or other diagnostic feature?

3. We had a license for Prolink II; can we ask Micro Motion/Emerson for a replacement license to run Prolink III Pro?

Best Regards

Abdelhafid

Clamp-on ultrasonic flowmeter - Custody Transfer

Rodrigo Sandoval — Tue, 09 Mar 2021 22:10:54 GMT

Dear Experts
I am working on an pipeline project, there are 3 pump stations. Each pump stations will have a Flow Meter Unit - Custody Transfer. However, the customer update his P&IDs and wants to consider an Clamp-On Ultrasonic Flowmeter.

Could you give me any advices or guidelines to know it's possible apply this required technology also if is it adequate for Custody Transfer?

I look forward to your comments or suggestions

Best regards

Floboss FB107 with Modbus Gas Composition

Shaiq Bashir — Wed, 03 Mar 2021 04:40:58 GMT

Dear Emerson

We are trying our hand for the first time on Floboss FB107. We want to connect gas composition coming from DCS on Modbus TCP. I understand that I have to receive concentration for each gas component in the Modbus Table and push it to specific device parameter under:

46-Meter Configuration Parameters>AGANEW1_Meter 1>Nitrogen and so on (please find the attached file)

Please confirm that can I send the un-normalized gas concentration to these parameters? My GC is only sending unnormalized concentration to us and that is what we have on Modbus TCP.

Will floboss normalize it by itself? If not then how to make it work?

Thanks in advance

Regards

emersonexchange365.com/.../floboss.pdf

Coriolis ELITE - Parameter check for any deposit on tube

Faiz Faiz — Fri, 26 Feb 2021 04:55:09 GMT

Dear Coriolis Expert,

What parameter on coriolis (to be precise on 5700 transmitter) which indicate that there is deposit or plugging on tube?, are SMV and Zero Verification enough?,

need help with detail technical explanation on this.

Thank you in advance,

Faiz