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Call us at 1-888-826-6342

Call us at 1-888-826-6342

High Accuracy oil filled Wet/Dry and Wet/Wet Differential Pressure Transducers

0 to 1 psi, Differential, 4 to 20 mA, 1/4" NPT Male, Cable, (-49 to 240 °F)


Item# PX409-001DDUI

Volume discounts available
Volume Discount Schedule
Quantity Price each
1-9 $1,134.53
10-24 $1,077.80
25-49 $1,055.11
50-99 $1,009.73
100+ $987.04

In stock

Lead Time (If not in stock): 5 Days
0 to 1 psi, Differential, 4 to 20 mA, 1/4" NPT Male, Cable, (-49 to 240 °F) PX409-001DDUI PX409-001DDUI
  • 5-Point NIST Traceable Calibration
  • Precision Micro-Machined Silicon Core
  • High Stability, Low Drift
  • Welded Stainless Steel Construction
  • 316L SS Wetted Parts on Wet Side– Clean Dry Gases on Dry Side
  • Now Available with M12 Connector
    Order Model PX459
    (See Part Number Builder at bottom of page)
  • Premium Temperature Performance
  • Broad Compensated Temperature Range
  • Durable, 1 Million Cycle Life
  • Ruggedized with Secondary Containment
  • Customized Specifications Available

PX409-001DDUI Model Options

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Edit these specs to order a different model. Not all combinations are valid. Options compatible with previous selections will be in bold.

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Pressure Range
Accuracy Value(compensated range)
Output Signal
Electrical Output
Pressure Port Type
Operating Temperature Range
Additional Features
Pressure Type
Accuracy Class
Pressure Port Size


Get all the great performance characteristics of the Micro-Machined Silicon Transducers in these wet/wet differential pressure models. These rugged stainless steel transducers are ideal for tough industrial automotive, or aerospace applications. They can be used in test benches, fitler monitoring, hydraulic, flow, or water/wastewater applications, as well as factory or pneumatic air, pitot tubes, air speed and other industrial or aerospace applications. The solid state silicon core and avaliable all stainless steel wetted parts will provide long, reliable service life with excellent long term stability.
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Rated 5 out of 5 by from Just the Best Since these USB-enabled transducers are performing perfectly in a unit operations lab at the University of Kansas, they are now installed in a new undergrad fluid mechanics lab experiment at the University of Delaware
Date published: 2020-04-30
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A previous answer stated "A static pressure 500 psi above the rated differential pressure range... can be applied simultaneously to both ports." Does this apply to all models? (i.e. the 0-250dpsi model is rated to 750psi line pressure instead of 500psi?)

Asked by: ZachF
That would be correct
Answered by: Applications Engineer JK
Date published: 2021-04-25

Should the transducer body be in a horizontal or vertical orientation when the ports are in a horizontal orientation?

Asked by: Madison
The position of the body (electronics housing) should not matter. The orientation of the pressure ports (especially on the low differential range units) can effect the reading. It always best to scale the instrumentation that you using to reading the signal from your transducer with it oriented in the position you are going to be using it in.
Answered by: Applications Engineer JK
Date published: 2021-09-10

Item# PX409-015DWUUSBH The data sheet states that the Output Signal is Digital and the Electrical Output is USB. Is there software available to monitor the transducers output if this connects thru USB?

Asked by: DFF2
Yes there is. Software can be downloaded free for Omega's website.
Answered by: JKengineer
Date published: 2020-06-15

I'm attempting to get a steady state flow through one of our apparatuses for flow assurance research for glaucoma but there is a problem with air being in the sytem during the flow testing. What is the best way to eliminate air from the equation?

Asked by: Tanner
Tanner, thank you for your question, I do not have a specific operating procedure to eliminate air from the equation, since I am not familiar with your system design. Typically you will suction our Air or flush out air before you apply a positive pressure. Thank you.
Answered by: SAE DJO
Date published: 2019-11-16

Currently I have the black and red cables attached to a COM and V supply respectively. I was wondering of the remaining green and white cables, which one is used as the analog input wire?

Asked by: PSU1
If you are working with a 4 to 20mA output sensor only the Red and Black wire are used. In a 2-wire loop powered device the power supply, load and sensor are wired in series. If you are not familiar with this type of hook-up please contact Omega at 1-800-826-6342 and ask for the Pressure Group.
Answered by: applications engineer JK
Date published: 2021-04-28

How can I find the response time of this transducer? (We need a fast response one)

Asked by: Mahdi
Thank you for your inquire These units have a under 1 mill second response time. Be understand that these and all the transducers we carry are not dynamic products. If you need more information? Please contact us directly.
Answered by: application engineer je
Date published: 2022-07-15

At one side of the transducer, we are going to have an aqueous solution with fine solid particles. Is there any consideration for this condition? Are "oil filled" transducers proper for this fluid? If no, please introduce a porper type.

Asked by: Mahdi
It depends on what you define as "fine" particles. The fitting has a small port that leads to a chamber where the diaphragm is located. The particles could possibly clog the port. This would not damage the unit but it would cause it to read incorrectly. If at all possible you should filter the solution to make it as clean as you can. The ideal solution would be a sensor with a flush diaphragm (no cavity). We do not offer a differential sensor with this feature
Answered by: Applications Engineer JK
Date published: 2022-07-15

If 500 psi is the maximum line/static pressure that can be applied to both sides of the sensor simultaneously, how can these PX409s go up to a measurement range of 1000 psid?

Asked by: ChrisB
On the 1000 PSID range units. A static pressure 500 psi above the rated differential pressure range (1500 PSI) can be applied simultaneously to both ports.
Answered by: Applications Engineer JK
Date published: 2021-02-04
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