High Pressure LED readout device (need help)

Using Arduino Sensors
1

In fact, I am searching for someone who can take on a small project (paid)

The outline of the device is simple enough, how simple it is to execute I don't know, hence my way of phrasing this.

It needs to measure static air pressure from a airtube, from 0 -250 bar / 0 - 3500psi
It only needs to show this on a simple LED panel.
It needs to be relatively small, 2" X 1" X 1" preferable, but there is give on this.

Thanks in advance for any help, pointers, info, etc

Kindly

T

2

Btw, these air tubes are relatively small, from 13cu to 22cu.

3

Any reason, why to not use a Ready-made device ?

http://www.aisat.com.au/d654-129-FFE415/digital-press-gauge-dc400-0-250-bar-ss/

// Per.

4

Any reason

Seven hundred and sixty one reasons ? Ouch.

But dealing with high pressure is not simple. You need careful and safe machining. So it is not a cheap wheel to re-invent.

5

Seven hundred and sixty one reasons ? Ouch.

Is still probably cheaper than getting someone to develop this from scratch, with all the problems you will have later on if you need the instrument serviced.

6

marco_c:
Is still probably cheaper than getting someone to develop this from scratch, with all the problems you will have later on if you need the instrument serviced.

Exactly.

7

It is the transducer that presents the technical challenges, and you can get those quite a bit cheaper than the previously linked gauge with digital indicator.

I've use the Omega series of 0-5V transducers in several projects and they work extremely well, are very stable and reliable for years of service. They are worth the asking price! A simple Arduino with display, together with about 10 lines of code to read the ADC and display the scaled value, would complete your project.

http://www.omega.com/pptst/PX309-5V.html

Edit: I've successfully used 16x oversampling and an external 12 bit ADC chip to get 13 bits of resolution out of the Omega sensor. However, for this to work you need a very stable, well regulated 12 V power supply for the sensor. You also need to be aware that overpressure, while safe for the gauge, leads to output > 5 V, which can damage the ADC. So resistor protection on the ADC input is required.