Honeywell ABPDANT015PGAA5 pressure sensor shows constant output value

Other Hardware Sensors
1

Hello!

I bought a Honeywell ABPDANT015PGAA5 pressure sensor for an experiment I want to do. The problem is that it outputs a constant value of around 98 whilst I put the sensor in vacuum chamber and pumped the pressure down to around 20 mbar.

This is the datasheet\instructions of the sensor: Safety and Productivity Solutions | Honeywell

What I did:

I found layout of the pins in the instructions and can be seen in Figure 1. I connected the pins to my Arduino Uno using the analog option in Figure 2. So pin 1 is connected to GND, pin 3 connected to A0 and pin 6 connected to 5V. The other pins are not connected.

917×542 104 KB

Figure 1

911×123 26.1 KB

Figure 2

The code I'm using to read these sensors is still very basic (I think it's from the tutorial code), because I wanted to get the sensor to work first:

void setup() {
  Serial.begin(9600);
}
 
void loop() {
  int sensorValue0 = analogRead(A0);
  Serial.println(sensorValue0);
  delay(100); 
}

Using this, what I read on my screen are constant 98's and sometimes a number 1 higher or 1 lower. The analog output of the sensor is supposed to be (from my understanding of the instructions) the percentage of the supply voltage. 98 is to be expected for atmospheric pressure, but when I put the sensor in a vacuum chamber and pump it down, the output does not change.

I have read the manual around 5 times now and searched the internet but could not find anything helpful.

2

The problem is that it outputs a constant value of around 98 whilst I put the sensor in vacuum chamber and pumped the pressure down to around 20 mbar.

The sensor you bought is for liquids, not for gases. The gas type would have the product id ABPDANN015PGAA5.

3

You need to look at the range for your Sensor - I expect it is intended to read positive gauge pressure - pressures above and related to atmospheric pressure .
Trying to run it below atmospheric pressure (vacuum) , will most likely not work - as you’ve seen.
You may now have damaged or at least upset it’s calibration.

4

pylon:
The sensor you bought is for liquids, not for gases. The gas type would have the product id ABPDANN015PGAA5.

I thought so at first, also. But re-reading the PDF, I see the liquid means the sensor is waterproofed for use in high humidity gases.

The REAL problem is putting then entire sensor in a vacuum, not connecting the port to the vacuum via a tube of some type.

Paul

5

Yes, presumably the sensor is a gauge (relative) rather than absolute pressure sensor, but the data sheet does not seem to make this clear.

Edit: on page 5 where the product code is explained, this is a gage (alternate spelling) sensor, so pressure at the port is measured relative to atmospheric pressure on the sensor chip. Positive pressures only, as well.

OP: you need a completely different type of sensor for a vacuum chamber. Please state the range of pressures you intend to measure.

6

hammy:
You need to look at the range for your Sensor - I expect it is intended to read positive gauge pressure - pressures above and related to atmospheric pressure .
Trying to run it below atmospheric pressure (vacuum) , will most likely not work - as you’ve seen.
You may now have damaged or at least upset it’s calibration.

Thanks for your reply! But as I saw it, this pressure sensor works from 0 psi to 15 psi. So it should work when reaching pressure below atmospheric pressure.

jremington:
Yes, presumably the sensor is a gauge (relative) rather than absolute pressure sensor, but the data sheet does not seem to make this clear.

Edit: on page 5 where the product code is explained, this is a gage (alternate spelling) sensor, so pressure at the port is measured relative to atmospheric pressure on the sensor chip. Positive pressures only, as well.

OP: you need a completely different type of sensor for a vacuum chamber. Please state the range of pressures you intend to measure.

So I would only need to connect the port (opening hole) to my low pressure environment? The range of pressure in which I would like to do measurements is between 0 and 1 atm.

7

Yep agree ...If that is not 0-15psia (absolute pressure), then it is 0-15psig ( gauge pressure) and it won’t read below atmospheric pressure ( vacuum).
Look at the spec closely - my guess is that is the issue ..

Homework : https://www.viatran.com/static/media/uploads/white_papers/gage_vs._absolute_vs_sealed_pressure_white_paper.pdf

8

So I would only need to connect the port (opening hole) to my low pressure environment?

No.

You need an absolute pressure sensor.