# Level Measurement - How to fill a remote seal (Capillary )

**URL:** <https://forumautomation.com/t/level-measurement-how-to-fill-a-remote-seal-capillary/1871>\
**Category:** Level Measurement\
**Created:** [March 26, 2017, 2:51pm UTC](https://forumautomation.com/t/level-measurement-how-to-fill-a-remote-seal-capillary/1871 "2017-03-26T14:51:54Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![shah](https://forumautomation.com/letter_avatar_proxy/v4/letter/s/f4b2a3/32.png) [@shah](https://forumautomation.com/u/shah)\
**Post date:** [March 26, 2017, 2:51pm UTC](https://forumautomation.com/t/level-measurement-how-to-fill-a-remote-seal-capillary/1871/1 "2017-03-26T14:51:54Z")

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DP remote seal Level Transmitter Capillary was broken. After installing new Seal with Capillary Transmitter did not give accurate measurement. can any body help me

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**Author:** ![carl\_e](https://forumautomation.com/letter_avatar_proxy/v4/letter/c/94ad74/32.png) [@carl\_e](https://forumautomation.com/u/carl_e)\
**Post date:** [March 27, 2017, 12:57am UTC](https://forumautomation.com/t/level-measurement-how-to-fill-a-remote-seal-capillary/1871/2 "2017-03-27T00:57:05Z")

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The installation or re-installation of a capillary and seal requires vacuum evacuation of the seal, capillary and pressure port to a hard vacuum level and then back-fill of the sensing elements with fill fluid. Any air left in the system will cause pressure measurement error.

That means that a replacement seal and capillary can not be mechanically replaced without vacuum evacuation and fill fluid back fill. Was that done without introducing air into the sensing system?

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**Author:** ![shah](https://forumautomation.com/letter_avatar_proxy/v4/letter/s/f4b2a3/32.png) [@shah](https://forumautomation.com/u/shah)\
**Post date:** [March 27, 2017, 6:58am UTC](https://forumautomation.com/t/level-measurement-how-to-fill-a-remote-seal-capillary/1871/3 "2017-03-27T06:58:21Z")

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Thanks for your Support. This was mechanically replaced without vaccum evacuation and reinstall new fill fluid capillary and seal. can u please tell me how to evacuate vacuum from pressure port. or any other suggestion to remove measurement error.

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**Author:** ![carl\_e](https://forumautomation.com/letter_avatar_proxy/v4/letter/c/94ad74/32.png) [@carl\_e](https://forumautomation.com/u/carl_e)\
**Post date:** [March 29, 2017, 1:25am UTC](https://forumautomation.com/t/level-measurement-how-to-fill-a-remote-seal-capillary/1871/4 "2017-03-29T01:25:21Z")

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There are two resources for techniques for evacuating and filling a remote seal.

[http://www.enfm.net/catalog/filling/fillingprocedure.htm](http://www.enfm.net/catalog/filling/fillingprocedure.htm)

[http://www.fluidcontrolsinstitute.org/pdf/resource/gauge/TSI310DiaphragmSealFillingGuide.pdf](http://www.fluidcontrolsinstitute.org/pdf/resource/gauge/TSI310DiaphragmSealFillingGuide.pdf)

My opinion is that you are far better off finding a local service that has the equipment and experience to perform the task. If you use remote seals you probably work in a process plant so you probably have access to local instrumentation services. Providing remote seal services is at a local level is quite common. One finds out quite quickly whether the service knows what it’s doing by the performance of the transmitter. A poor job means either no pressure reading or time lagged pressure readings that are ‘squishy’ and not responsive to an step input change (applying a step in pressure to the seal diaphragm).

I know that the two technicians in my company’s service department that do that each went through a learning curve to learn how to do it correctly.

The equipment is not very specialized (vacuum pump, vacuum gauge, hoses, valves, fill fluid), but the vacuum gauge alone is a $1,000 vacuum gauge. The fill fluids are commercially available but at what volume and price? If you have buy 10L of fill fluid to fill a capillary and seal that takes 8ml is that a reasonable investment?

Seriously consider paying a service to fix it for you.

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**Author:** ![shah](https://forumautomation.com/letter_avatar_proxy/v4/letter/s/f4b2a3/32.png) [@shah](https://forumautomation.com/u/shah)\
**Post date:** [March 30, 2017, 5:08am UTC](https://forumautomation.com/t/level-measurement-how-to-fill-a-remote-seal-capillary/1871/5 "2017-03-30T05:08:52Z")

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Carl Many Thanks for your Support.