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Lower sensor trim excess correction on absolute pressure transmitter

Hello everyone, I’m from Taiwan and this is my first time, hope can help me solve this problem, Thank you so much!

Absolute pressure transmitter: 3051T Capillary type

Upper / Lower Limit: 0 ~ 1551.4 torr

The atmospheric pressure for the standard gage is 753 torr.

Installation site make a transmitter to get 826 torr, when I calibrate perform "Lower Sensor Trim"(TREX), I want to make the 826 torr become 753 torr, but the TREX showed "Excess Correction".

I know maybe move the transmitter close to installation site of the diaphragm will solve this problem, but how much distance to move? I don’t understand how to calculate.

Hope can help me solve this problem.

Many thanks!

楊豪華德

• 19 Sep 2024 7:59 PM
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3 Replies

• Varshneya Sridharan

  

  • 20 Sep 2024 11:37 AM

  Hello Howard,
  
  Thanks for posing the question. It is possible some form of excess correction got applied and that is resulting in the trim too high fault. You could attempt the re-ranging procedure laid out in section 2.5.5 of the manual. I am attaching the link to the manual here: www.emerson.com/.../manual-rosemount-3051-pressure-transmitter-en-89452.pdf.
  
  I also noticed you are from Taiwan so which falls under the Asia Pacific office. Once you have tried above and you run into further issues, I am happy to support the query. You can email me directly at Varshneya.Sridharan@Emerson.com. Thank you !

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• 楊豪華德

  

  • 10 Oct 2024 3:11 PM

  In reply to Varshneya Sridharan:

  Hello Varshneya Sridharan,
  thanks for your reply.
  In section 4.1.6 of the manual, a note comment "The transmitter allows approximately five percent deviation."
  I'm confused for this.
  If transmitter range: 0~1500 torr, is this calculation standard according to the LRV / URV or Upper Limit / Lower Limit?
  Thank you!

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• Varshneya Sridharan

  

  • 11 Oct 2024 10:24 AM

  In reply to 楊豪華德:

  Hello Howard,
  
  Thanks for the call to action on this.
  
  The five percent deviation called for here refers to deviation with reference to the URL (Upper Range Limit). If you take a Range 2 transmitter for example where the URL is 250 inH2O, our transmitter can still measure an additional of 5% of URL which is 262.5 inH2O.
  
  I hope this clarifies your question. You can email me directly at Varshneya.Sridharan@Emerson.com from your company email. Thank you !

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