mag5000 shows triangles with f70 problem

 Heloo,

I have the problem with mag5000,it show triangles with  f70 problem,it's also reading negative values and it change the value every moment...from -30 to+30,40 l/m³  ...I try to see in manu settings...but all setings are the same like in the other one...I have three mag5000 in same mesure point...every of them mesure diferent pipe flow...the other one don't have triangles but mesurre is also from - to +....and just third one is working fine...can you tell me what to check? 

thanks

Preetbrar

Typically, when no water in pipe you should get alarm on screen. Generally, when you kept empty pipe detection OFF, during this phase due to any unwanted interference can cause fluctuating flow rates. Fluctuations can be very small or very big. I've seen flow meter fluctuating between -1400m3/h to 500m3/h. Basically when empty pipe detection is OFF, you are allowing electrodes to read the wrong values. 

First remedy is to ON your Empty Pipe Detection feature. It worked on major cases on water distribution lines, when pipes drained due to shortage of water / some other issues.

Second remedy is to provide grounding ring. Possibly grounding electrode malfunctioned or covered with some oil/dirt inside the sensor.

You can also set the totalizer function to Net Flow Forward or Net Flow Backwards depending upon your application.

Regards,

Davinder Singh

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Split from SITRANS F M MAG 5000 TOTALIZER 1 PROBLEM.