How to use pressure sensor (Honeywell NBPMLNN060PGUNV)

Hello David,

Please bear in mind that you've bought the NBP....060PGversion, which gives the difference between measured and surrounding atmospheric pressure (see datasheet page 5, top of page) . The NBP...060PAversion gives absolute pressure. That at least clarifies why you see no output when you're not applying pressure at all.  The output pressure you see is probably the offset (+/-7mV/V maximum).

The only thing that puzzles me is that the output voltage decreases with increasing pressure.... 

Good luck,

Victor

Hello Victor,

thank you for your reply. Yes, the "offset"/error does seem reasonable as you mention.

I did purposefully purchase the *PG-version, in order to avoid problems caused by surrounding pressure differences.

But as you point out, the decrease in voltage is rather mysterious.

Thanks,

David.

Nobody out there seen this kind of behaviour before?

Or for that matter have been using this type fo device?

I'll take any experience, as it might just suggest a way for me to get the device working.

(Anything in the order of "Never use un-loaded" is appreciated as well, seeing how something has to be a miss in my way of using the device.  - Assuming it is working properly of course).

Thanks,

David.

Have you tried what it does when you make vacuum? Does the voltage go up then? Any chance the voltage goes up with decreasing pressure? Just a thought, I hope others have more useful hints / tips.

I was wondering if you had mis-identified the pins but if you did I would expect the offset to be about 1/3 of the excitation voltage.

What is the voltage between the output pins and ground ? (I expect 1/2 the excitation voltage).

I wonder if you just have  a faulty sensor ?

MK

Hi guys, sorry for the late reply.

Thank you very much for your input!

I made sure all connections were correct and then I tested the vacuum response. It also decreased when changing the pressure.

So obviously something was wrong.

It contacted the manufacturer, but due to no response (partly causing the long response time) I ended up purshasing another unit.

This one I double-checked everything and sure enough, the thing generally worked as expected.

I'm now getting 130mV @ 3-4bar, expecting 150-200 mV.

For now I consider my problem solved, and once again: Thank you guy for the help!

Cheers,

David Larsen.

You're welcome. Thanks for reporting it's solved now!

Dear all,

I am trying to get the pressure readings from the NBPDLNN030PAUNV. Could someone please let me know what logic/code should I use to obtain the pressure. Also, which pin to use to get the pressure readings I mean Vout- or Vout+ . I am using an arduino board and trying to take the pressure reading from both Vout- and Vout+ separately using the logic

const float Null = 0.00; // Null VDC

  const float Sensitivity = 21.0;  // Sensitivity

  pressure = analogRead(ADC_HONEYWELL);

  pressureVDC = (float)pressure * 0.0048828125; // (5/1024 = 0.0048828125)

  pressureVDC = pressureVDC - Null;

  pressurePSI = pressureVDC / Sensitivity * 1000;

None of the pin is giving me correct readings. Please let me know how should I write a code to obtain correct pressure readings. I have also searched on the internet but could not get any details about the code to get the pressure.Do I need to connect the Vout- and Vout+ pins some how and then take the pressure reading or do I need to include both Vout- and Vout+  in some logic to find the correct pressure readings.

I am novice to sensors/automation/electronics. Could someone please suggest me a good blog/tutorial/book which I can follow to get started in this field.

Waiting for your reply!!

Regards,

Himanshu