# Measure density with DP transmitter?

**URL:** <https://forumautomation.com/t/measure-density-with-dp-transmitter/1329>\
**Category:** Analytical Instruments\
**Tags:** density\
**Created:** [September 5, 2016, 5:57am UTC](https://forumautomation.com/t/measure-density-with-dp-transmitter/1329 "2016-09-05T05:57:30Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![automate](https://forumautomation.com/letter_avatar_proxy/v4/letter/a/51bf81/32.png) [@automate](https://forumautomation.com/u/automate)\
**Post date:** [September 5, 2016, 5:57am UTC](https://forumautomation.com/t/measure-density-with-dp-transmitter/1329/1 "2016-09-05T05:57:30Z")

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Can we measure density of any liquid with Differential Pressure Transmitter and How?,which factors we need to consider to measure the same.

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**Author:** ![denizen](https://forumautomation.com/letter_avatar_proxy/v4/letter/d/848f3c/32.png) [@denizen](https://forumautomation.com/u/denizen)\
**Post date:** [September 5, 2016, 5:58am UTC](https://forumautomation.com/t/measure-density-with-dp-transmitter/1329/2 "2016-09-05T05:58:38Z")

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For density a common approach is to install the d/p transmitter above the tank. Install two dip tube into the tank or use two tank taps at a convenient distance apart and use air or acceptable gas into the dip tubes with a needle valve on the inlet side of small rotameters to set a flow of roughly 1scfh (500 cc/min). The gas supply pressure must exced any possible tank pressure. Use the d/p pressure and known level difference to calculate the actual density. The d/p transmitter is conveniently calibrated in terms of mmWC or INWC. Density = (density of water)\*((measured hydrostatic head)/( dip tube level difference)). See Liptak Instrument Engineers Handbook, 3rd Edtion, chapter 3.7 “Bubblers” for more details

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**Author:** ![508645](https://forumautomation.com/letter_avatar_proxy/v4/letter/5/c6cbf5/32.png) [@508645](https://forumautomation.com/u/508645)\
**Post date:** [October 5, 2017, 2:59pm UTC](https://forumautomation.com/t/measure-density-with-dp-transmitter/1329/3 "2017-10-05T14:59:50Z")

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@denizen can you please elaborate more on this topic.