Multifunction DAQ

cancel
Showing results for 
Search instead for 
Did you mean: 

How to read pressure in real units (e.g bar) from input analogue voltage?

Hi

I have 35 X HTT Pressure Transmitter (3 wires) and NI-9205 which acquires the reading of the pressure sensor 35 X HTT as voltage. How can I convert it to bar for example?

Thanks 

0 Kudos
Message 1 of 8
(347 Views)

According to this data sheet, the sensor has a range of 0 to 1 Bar and an output voltage range of 0 to 10V.  This makes the math easy: just divide by 10.


GCentral
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines
"Not that we are sufficient in ourselves to claim anything as coming from us, but our sufficiency is from God" - 2 Corinthians 3:5
0 Kudos
Message 2 of 8
(331 Views)

So, Is it always a linear relationship? If my sensor ranges 0 to 30 bar, first divided by 10 then multiply by 30?

Thanks 

0 Kudos
Message 3 of 8
(307 Views)

@alhabeeb wrote:

So, Is it always a linear relationship? If my sensor ranges 0 to 30 bar, first divided by 10 then multiply by 30?

Thanks 


Unless told otherwise in a datasheet, assume linear relationship.  Because the min of both the voltage and measurement, it is a simple 30Bar/10V = 3Bar/V.


GCentral
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines
"Not that we are sufficient in ourselves to claim anything as coming from us, but our sufficiency is from God" - 2 Corinthians 3:5
0 Kudos
Message 4 of 8
(298 Views)

In the datasheet:

alhabeeb_0-1721824593137.png

But I didn't understand it.

0 Kudos
Message 5 of 8
(294 Views)

@alhabeeb wrote:

In the datasheet:

alhabeeb_0-1721824593137.png

But I didn't understand it.


These are about the internal working of the transmitter and do not care in the context of the electrical equivalents.

Treat the output signal as linear mapping to the pressure measurement range.

 

Santhosh
Soliton Technologies

New to the forum? Please read community guidelines and how to ask smart questions

Only two ways to appreciate someone who spent their free time to reply/answer your question - give them Kudos or mark their reply as the answer/solution.

Finding it hard to source NI hardware? Try NI Trading Post
0 Kudos
Message 6 of 8
(281 Views)

Thanks for your response.

As you said, I should have 0.333333 (V) when I measure the ambient pressure, Should I?

 

I'm using ni-9205 to aquaire the out signal. I connected pin 1 and pin 3 to negative and positive, respectively to the power supply 23 (V), and I connected pin 2 to channale 0 of the ni-9205 and the negative terminal from the power supply to COM of the ni-9205 and I used differential configuration, but I got not logic voltage readings (e.g. -0.4)!

Any suggestion to solve this issue?

The photos of my devices are shown here

alhabeeb_0-1721989265913.jpegalhabeeb_1-1721989283237.jpegalhabeeb_2-1721989296491.jpeg

 

Thanks 

0 Kudos
Message 7 of 8
(258 Views)

@alhabeeb wrote:

Thanks for your response.

As you said, I should have 0.333333 (V) when I measure the ambient pressure, Should I?

 

I'm using ni-9205 to aquaire the out signal. I connected pin 1 and pin 3 to negative and positive, respectively to the power supply 23 (V), and I connected pin 2 to channale 0 of the ni-9205 and the negative terminal from the power supply to COM of the ni-9205 and I used differential configuration, but I got not logic voltage readings (e.g. -0.4)!

Any suggestion to solve this issue?

The photos of my devices are shown here

alhabeeb_0-1721989265913.jpegalhabeeb_1-1721989283237.jpegalhabeeb_2-1721989296491.jpeg

 

Thanks 


Approximately 0.33V for 1 bar pressure.

Were you able to confirm the sensor outputs 0.33V using a multimeter?

In addition, please connect the AISENSE to COM on 9205 terminals.

Santhosh
Soliton Technologies

New to the forum? Please read community guidelines and how to ask smart questions

Only two ways to appreciate someone who spent their free time to reply/answer your question - give them Kudos or mark their reply as the answer/solution.

Finding it hard to source NI hardware? Try NI Trading Post
0 Kudos
Message 8 of 8
(243 Views)