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temperature limit for existing pressure and flow transmitter

HI

I am introducing a colder fluid to an existing process line in which instruments are installed (pressure, temperature, and flow sensors & transmitters). want to do a check that the existing instruments will withstand the new colder temperature. Which engineering/technical document will give me that information. I looked in the datasheet but I did not see a direct answer except for the temperature element data sheet showing the element temperature range.  Any ideas please ?

Thank you

yacine
  • Michael Olivier

    Hello,

    For pressure instrumentation, the lower temperature limit will depend on its configuration and how it is installed.  In the various product data sheets, there is a table in the back that lists the process temperature limits.  Below is an excerpt from the Rosemount 3051 Pressure Transmitter product data sheet.  A few examples to highlight from the table:

    • A Rosemount 3051 transmitter with a Silicone based fill fluid can handle process fluids as cold as -40 F (-40 C). 
    • A Rosemount 3051 transmitter equipped with a remote diaphragm seal and Syltherm XLT fill fluid can go as cold as -102 F (-75 C)

    Feel free to contact your local Rosemount Instrumentation representative if you need help decoding your model numbers so that you know what type of fill fluids are in your pressure transmitters. 

    Best regards,

    Michael

  • salehatiyyat

    In reply to Michael Olivier:

    I believe it should be in Datasheets.
    How cold is it?
  • yacine

    In reply to salehatiyyat:

    Up to -160 C
  • yacine

    In reply to Michael Olivier:

    Hi Michael

    Thank you for your reply. existing line operating temperature is -42 and the new introduced fluid temp will be around -162. in the rosemount product datasheet, did not see this low temp however we have an installed PDT (coplanar differential pressure 3051) in one line with operating temp -162 C as indicated in datasheet and confirmed by process eng.

    Now for my existing PT, operating temp is only -42 and the product data sheet is not indicating this low temp, does that mean I cant use it and what will happen if I do!?

    is there a rosemount product that can withstand this low temp? any comment on the PDT I mentioned earlier ? please

    Thank you very much
  • yacine

    In reply to salehatiyyat:

    Hi salehatiyyat

    Thank you for your reply. existing line operating temperature is -42 and the new introduced fluid temp will be around -162. in the rosemount product datasheet, did not see this low temp however we have an installed PDT (coplanar differential pressure 3051) in one line with operating temp -162 C as indicated in datasheet and confirmed by process eng.

    Now for my existing PT, operating temp is only -42 and the product data sheet is not indicating this low temp, does that mean I cant use it and what will happen if I do!?

    is there a rosemount product that can withstand this low temp? any comment on the PDT I mentioned earlier ? please

    Thank you very much
  • Michael Olivier

    In reply to yacine:

    Hello Yassin,

    For cold cryogenic applications like this, best practice is to mount the pressure transmitter above the process piping and make the connection using a minimum of 2 feet (0.5 meters) or more of impulse piping. If this is the case for your installations, then your existing instruments will likely be fine. Having the transmitters remotely mounted in this configuration normally provides enough temperature separation from the cryogenic process so that the transmitter is not actually seeing -162 C at the isolating diaphragms.

    In the event that you actually do end up exceeding the lower process temperature limit of the transmitter, you will notice a severe degradation in the time response of the transmitter (i.e. it will look like it is not responding to pressure changes). This is because the internal fill fluid in the pressure sensor will become extremely viscous and non-responsive. If you then bring the transmitter back to within the temperature spec, it will likely return to operating as expected.

    Best regards,
    Michael
  • yacine

    In reply to Michael Olivier:

    Thank you very much for your answer Michael. Very helpful.
    Best Regards
  • AJ Weisenburger

    In reply to yacine:

    Would a heated instrument enclosure help? I do realize they are meant more for cold ambient (not process) conditions. The heated enclosure would help keep the entire transmitter (module and top works) at a warmer temperature. If interested, I can go into further detail on how to get one.
  • Andrzej Czechowski
    Link:
    www.emerson.com/.../manual-rosemount-3051-pressure-transmitter-hart-protocol-en-75994.pdf

    Please have a look at page 98

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