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Anonymous Poster #1

DPPT

07/06/2012 8:59 AM

Hi All

We have install diffrential pressure transmitter with two sensing high/low, the sensing element low side connect to drum to measure vacuum and the high is plug off. is it the install is coorect?

Please advise.
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lyn
Guru

Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#1

Re: DPPT

07/06/2012 9:51 AM

OMG!

What does the operators manual say?

What does the seller of the equipment say?

Hire an instrument tech to install it and commission it.
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SolarEagle
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Join Date: Mar 2007
Location: by the beach in Florida
Posts: 33392
Good Answers: 1817
#2

Re: DPPT

07/06/2012 12:04 PM

Is it working? I guess it depends on what you're using it for....You're obviously not using it to measure flow or density, or pressure differential....If you're using it simply as a low pressure cutoff switch, then I'd say you're under utilizing this controls capability....

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 All living things seek to control their own destiny....this is the purpose of life
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Iris
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Join Date: Jul 2010
Posts: 669
Good Answers: 176
#3

Re: DPPT

07/06/2012 1:22 PM

No, it won't work properly. You cannot "plug off" the high side. Which ever port is not connected to the tank needs to be open to atmosphere.

In our area, we need to put a scintered filter, like those used in hydraulics, to keep the bugs out which will build nests in the open port.

How you configure it depends on whether the 4-20mA output rises or falls with higher vacuum and if there's an integral meter, whether the values are positive or negative.

I would have connected the high side to the tank and left the low side open to atmosphere, but that's me.
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Ace Boeringa
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United States - Member - New Member Engineering Fields - Control Engineering - New Member

Join Date: Mar 2006
Location: Washington USA
Posts: 566
Good Answers: 53
#4
In reply to #3

Re: DPPT

07/06/2012 7:26 PM

I concur with Iris. GA
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leveles
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Join Date: Jan 2008
Posts: 1753
Good Answers: 59
#5

Re: DPPT

07/07/2012 11:05 AM

A GA to #3
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