Troubleshooting on Krohne Magnetic Flowmeter

Consult operator's manual.

Consult manufacturer's web site.

Call manufacturer's tech service.

Call manufacturer's tech to come out and fix the equipment.

There are issue that you cannot get from the user guide or sometimes the tech service don't even has the solution.

example:

I hv encounters this problem on Krohne EM flowmeter

1. SCADA display reads 9 m3/hr of flow but the display at the field instrument shows 0 m3/hr. All parameters are configure correctly; such as flow range, 4-20 mA OP etc.

Let me take a stab in the dark:

1. The Krohne meter is reading 0 m^3/hr when the process is not running.

2. The SCADA is reading 9 m^3/hr at the same time.

3. The Khohne meter is set for 0-36 m^3/hr = 4-20 ma output.

Is this correct?

Well, almost. The Flow meter has to be ranged 0-45m3/hr to get the indicated error of 9m3/hr at an actual flowrate 0m3/hr for the error you suspect.

9/45 = 20%

4/20 = 20%

Yep. Just thinking about that while working in the garage. Good catch!

So the settings cannot be "correct". Well done!

Field display IFC is set 0- 508 m3/hr and the SCADA process range als0 0 - 508 m3/hr. (at 4 - 40 mA)

I'm going to guess that (at 4 - 40 mA) is suppused to b 4-20 mA.

9 m^3/hr on a signal scaled 0-508 m^3/hr is ~ 1.77%

Sounds to me like you just need to do a good "Full pipe - no flow" zeroing of the meter.

Either that or do a calibration on your analog output from the meter/ analog input to the SCADA.

That would suggest that the <...SCADA...> input is ranged 0-20mA and that the problem lays there and not in the flowmeter.

please check the analog output parameters ,and match the pv with the analog output

for example output 4-20ma and set the minimum range to 0 or whatever you want as minimum and check. hope it will work .

When the converter/transmitter (the electronics box) is remotely mounted from the mag tube in the line/pipe (not connected right to the mag tube), the connection between the mag tube and the transmitter needs to be made with 'special cable'.

Every manufacturer sells 'special cable' to connect the two, or has a recommendation for equivalent commercially available 'special cable'.

I have seen several instances of severe electrical noise and substantial PV offset when 'special' cable is not used; just the wire off the spool on the electrician's cart is used.

Amazingly, in about half of those cases, the 'special cable' had been ordered and delivered and was sitting there in the pile of empty cartons and discarded manuals so it was easy to show how to eliminate the noise and offset, with a quick connection of the 'special cable'.

Yes agree with you on the cable used. It is original cable for both field and sensor from Krohne and connected directly. No problem with the wiring. It was reading well until recently when the convertor read zero when there is flow.

Replace the new convertor and setup the parameter ie, GK/GKL. flow range and dimension.