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Anonymous Poster

DP Type Transmitter

07/21/2010 11:46 PM

We received a DP transmitter to measure flow :

process data : ambient conditions- 32degF to 122 deg F

process flud - natural gas, normal/Max pressure-1350/1400

differential pressure- 3 to 4

temperaure normal/max/design - 93.2 /100/-50 to 130 DEG F

Flow rate min/normal/max (lb/hr) - 13552/70480/77528

instrument Data :

Instrument range: 0 to 250 Inches H2O

calibration range : 0 to 150 inches H2O

Temperature range: -50 to 130 Deg F

over range protection is 130%

static pressure range : 2000 psig

pressure element : integral diaphram

Material is received as per the above data but my doubt is instrument range is saying 0 to 250 Incehs H2O which equals to 9.03 psig.But the normal ressure applies on the upstream is 1350 psi ( as per process data). 1350 psi = 37368.92 inches of water

mean to say, instrument range is only : 0 to 250 Inches H2O but normal pressure is more than that.as per me which is wrong

Can any one help me . i will be gratefull to him.

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#1

Re: DP type transmitter

07/22/2010 12:36 AM

Hi,

Differential pressure transmitters are design to measure the difference in pressure of two points in the process, each one these points are connected to their corresponding low side and high side of the transmitter,in some level measurements one side of the transmitter is left open to atmosphere.

With that said the instrument range (0-250) means that the maximum DIFFERENTIAL pressure for this transmitter to work correctly should not exceed 250" of water.

According to the transmitter's data the it's calibration range is 0-150" of water this range is well within the transmitter's instrument range (0-250").

The transmitter's static pressure range is 2000 psig which means that the maximum pressure that can be applied to the low and/or the high side legs of the transmitters should not exceed 2000 psig.This range is greater than the process pressure (1350 psig) so this transmitters it's suitable for this application.

If this transmitters is put in service with 1351psi on the high side and 1350psi on the low side which will give us about 27.7" of water differential as you can see this transmitter will work just fine for this application.

Thank you

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Anonymous Poster
#2
In reply to #1

Re: DP type transmitter

07/22/2010 2:39 AM

Thanks

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#3
In reply to #1

Re: DP type transmitter

07/22/2010 2:54 PM

Sounds like OP thinks it is a Good Answer, so I vote you one.

Well done!

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