Setting The Low Flow Cut Off Magmeter

There is one other way,.... and that is to get a MagMeter that falls in the range you require....

Get an AMFLO Pro Remote from your favorite supplier:

If you want help in this forum you must include the meter model number and catalogue number.

Does the meter have connections and capability for installing a remote display or connecting to a DCS or HMI?

Does the meter have a communication port?

Is it HART compatible?

If yes; Connect a HART analyzer with a 250 ohm resistor across the terminal per HART protocol and see if you can access the program.

If you do not know the answers to these questions or all of the answers are "no"; then you need to contact the OEM for help.

Save everybody some time.

Go to their website Aquametro - AMFLO® MAG Basic , or call tech service and ask them.

Here is the link to the manual. It is blind version. It has no display. Supplier doesnt want to help us as he says these meters are obselete and there is no support.I have around 20 nos of these flow meters so it is not feasible for us to change to a different meter.I need to figure a way out

https://www.dropbox.com/s/ayc9nsbphl7qxbe/Amflo%20light.pdf?dl=0

Where does the 4-20mA output go?

Why can't you use that?

I can answer that.

If the flow is below the working range of the instrument, the 4-20mA, which is no doubt what they are using for readout since the unit has no display, is just going to read 4ma. (actually, it will probably be 3.91 to 3.93mA or so - typical no detection output of a 4-20mA transmitter) That would appear to be the problem facing the OP.

What flow GPM? GPD? MGPD?

What size pipe?

Honeywell and Yamatake has a handheld communicator you can use to monitor readings settings and do calibration. The safest way around is to buy replacement, could be parts or the whole unit. If its intgrated to some HMI, i think it would just be alright so long as it serve its purpose reliably. Read manuals.

Most flow devices have a minimum below which they will not register properly, sometimes given as a "turn-down ratio" of actual flow to maximum flow.

• If the analog is wired to some electronic control system, then invoke some code that says "if the analog signal is below a minimum set point [i.e. the meter minimum point as shown in the User Manual], then overwrite a zero onto the indicated flow register" and "if the valve in the pipeline is closed then overwrite a zero onto the indicated flow register".
• If the meter won't register the flow as it is too low, then the pipe is too large and the meter is incorrectly selected for the task.

Once again I ask.............

What flow GPM? GPD? MGPD?

What size pipe?

What is the model number?

Flow is in m3/hr.

Pipe size varies. I have around 20 nos of these shitty meters of various sizes from dn 200 to dn 500 .

Low flow cut off varies depending on the dn.

Ok, Your piping is a bit smaller than what I'm used to working with. We had a 1200 mm dia. pipe that was having trouble measuring low flow.

Our solution was to buy a different meter and sensor that was capable of measuring the flow we needed.

I know this really isn't an answer, but you may need to bite the bullet and buy a different meter for your low flow areas.

Good luck

New issue? Or old issue traced back to the original installation?

If a new issues; What changed?

If old issue; Why was it not corrected during commissioning of the equipment?

In all fairness to the meter manufacturer and supplier:

How old are the devices? If they are past expiration date most likely all will fail soon.

How often are the flow tubes pulled out of service for cleaning and bench calibration testing?

Magnetic flow tubes will scale up causing measurement error that will increase with length of in-service time depending on the fluid being measured.

How critical is the accuracy of measurement to the process?

If critical, I see no viable option other than replacing the units with new equipment.

It might be possible to tweak the controls but how would you know if the meter is function correctly? Or if the measurements will be linear with increased flow?

Changing the zero/low cutoff point could well destroy the accuracy of the meter.

It would be best of the failed/bad devices are replaced with new devices that will maintain accuracy throughout the process required operating range.

Anything short of that is a "crap shoot".

Consider the possibility of the process and plant design being <...sh*tty...> and not the meters in themselves.

• Several readers have asked for flowrate information and said information has still not been forthcoming. There is no point in having large pipe for small flows.
• What is in the pipe, its temperature and its pressure are pretty fundamental pieces of data that are also still missing.

Help the forum to provide the help needed, otherwise the entire thread is a complete waste of time and space! <...Sh*tty...> questions get <...sh*tty...> answers!

I am sorry for not answering the questions. Here are the details.

Flow meter make: Aqua Metro MagproDN: 400Flow below 60 m3/hr are not detected.

You might want to consider a different type of flow meter. Perhaps a D/P orifice plate type would work better for your application.

If you aren't happy with the current vendor, call some others and discuss it with them then compare the gathered information.

We have 100 other location where we have used magmeters of different brands (Simens MAg 5100W,Badger and Endress Hauser) and we havent any problems with the meters. There is no problem with the design as I have seen other location with the same set up detect the low flow.This is the problem with the aquametro meters. I have tried to contact the Supplier and he doesnt want to offer us help as we have stopped buying there meters. Kindly let me know

To increase the velocity you will need to reduce the size of the flow sensor, you will have to calculate the sensor size for the optimum velocity. It does not matter if the rest of the pipework are different sizes. Your flow rate will be the same.