Rosemount 3051 Rerange 1

[CMfgE1]

Level transmitter (DP) ranged from -375"h20 (LRV) to 0"h20 (URV).
I tried to reverse this to 0"h20 (LRV) to +375"h20 (URV)
But get errors. Is there a way to successfully flip the range to make it positive?
I am using a Hart 275 for communication

Thank you

 

[jsummerfield]

The factory does funky things with the calibration. Are you certain that you need to make this change?
My experience is with a notebook PC and AMS software using a HART modem. However, everything that you can see with the PC should be available to the handheld.

Dial the Rosemount 800 number and they should sort you out.

John

 

[CMfgE1]

Well in order to do a zero cal I would think the transmitter needs to be at zero. Only when Im at 0"wc I am also at 20ma so this function doesnt work. If I try to rezero the transmitter say for height purposes I cant because it outputs 20ma and tries to make the milliamps 4 when zero shifting. I think I can perofrm these functions backwards, meaning, at 0"wc treat that as a span adj and at -375"wc as zero and do at D/A adj for the zero ma's.
Yes the factory does weird things and this is one of them.
I will keep searching.


Thanks

 

[underpressure1]

I hope you already sorted out this issue,
but anyway: try to apply a positive pressure on the negative side of the transmitter. Retry the configuration with the 275.
If it does not work try to upload Factory trim.
The transmitter will be re-set.

I am using the ABB 264 models and I am doing that using the local buttons without any external configurator..
And it works.

 

[CMfgE1]

Thanks for the info. What I found was that the factory trim and ranges were set to the negative. So what I have done is learned to ignore the display. I correct the 4ma signal by trimming the zero to the LRV. This forces the output to 4ma. Then I just apply pressure and perform the cal. At the high end I just adjust the span to the URV. My standard is in positive units ("h2o) and my test is setup the same. Also we are using the 4-20ma signal to a plc input so it worked out. Thanks for the response.

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