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Replacement with different capillary length & ID

HI

I have a failed DP level transmitter. model number 1199DDC58AFFW72DA00, transmitter is part of 2out3 configuration, 3 transmitters in total.

 

I have available in stock model number 1199DDE60AFFW72DA00. the difference between the two is the capillary length and capillary ID (first one is C58 and the one available is E60). Is it feasible to replace? and what result will it give me if I do? I am assuming it will be a different reading than other two transmitters since its a different capillary length? If I install,  recalculate, and reconfigure the URV & LRV, will it give the correct reading? what about the capillary ID? is it possible to install and what is the impact ?

 

Thank you for your feedback/comments.

yacine
  • Kate Zaengle
    Yacine,
    The difference between the two diaphragm seals is the ID of the capillary.  Here is the model number selection codes for the seal capillary diameters:
    The capillary ID is mostly used to determine response time to a step change in reading of the process variable.  In this case, there is a very small difference between the capillary ID you have been using and the capillary ID of the unit that you have available as a replacement.  If the time response is not extremely critical you should be able to use your spare and have the same results in your measurement loop.  You can also send us more information about you application and we can provide a diaphragm seal performance calculation for you.
    Best regards,
    Kate Zaengle
     
     
     
    Kathryn Linder Zaengle | Executive Sales Consultant l Rosemount, Inc.
    Emerson Automation Solutions  | 103 Enterprise Drive | Royersford | PA | 19468| USA
    T +1 215 307-5669| Direct
    Rosemount Customer Central l 800 999 9307
    Email:  Kate.Zaengle@Emerson.com
     
     
     

    Kathryn Linder Zaengle

    Executive Sales Consultant

    Emerson / Rosemount Measurement

  • Nathan Stokes

    In reply to yacine:

    Yacine,

    The differences in error between your two systems should minimal as long as the actual tap to tap distance the units are installed on is the same. They also will need to be installed in a way that they are seeing the same ambient conditions (temperature, sun vs shade), but because you are replacing an existing system, this should not be a concern as I am assuming the previous system was performing well.

    The longer capillary length and smaller capillary internal diameter will have an effect on the response time of the system as Kate mentioned. The replacement system will be 2-3x slower to respond to changes in pressure. As long as your process conditions are not changing rapidly, the spare system you have should be fine.

    Thanks,
    Nathan Stokes

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