For an engineering project, I have a sensor to measure a certain gas concentration. Unfortunately this sensor returns unitless values between 0-1023, and there is no decent alternative to it. In order to calibrate and understand the meaning of these values, I'm looking to compare the measured values to the theoretical concentration. This calculation is something I am not confident in performing myself and so I would like to ask for some advice here.
The working conditions are as follows:
A 3 liter airtight box, opened from above, with 2 identical pipe holes on opposite sides. Both holes are of 14.02 mm diameter. The gas flows in through one, at 250 ml/minute. The other hole allows the air to flow through it, to relieve the pressure in the chamber. The chamber at first is filled with normal ambient air. The gas that flows in is 95% ambient air, and 5% isoflurane, which is the gas I am measuring.
With this information, how can I calculate an estimation of the isoflurane concentration in the chamber, preferably in PPM?
Firstly, I think you might have to review the questions. The concentrations of the gas? The pressure data can be used emperically to determine the concentration of the gas. Going buy your information supplied there will have to be a material balance about the Chambers, compute the limiting concentrations of the isoflurane.
I may suggest you to prepare five bags filled with isoflurane and air in reasonable known concentration range (low to up of your sensor reading based on your current reading), then get the readings from your sensor. You may obtain a regression curve after the test. The corresponding concentration related to the sensor reading based on the curve should make sense to you.
Xinguang Wang Thanks for the answer. That is the direction I intended to take it, unfortunately I can't buy bags with isoflurane. If I fill them up myself, then try to insert the sensor, I fear that instability and leakage will have an effect on the outcome.
Prosper Ovuoraye I'm not sure I understand what you mean. The chamber itself is open to the room, and is only sealed while isoflurane flows in. I have no pressure sensor to know the current pressure within the chamber. If you mean to use the relative pressure of each component gas to assess the isoflurane concentration, that was a direction I looked into, but could not find an available air composition sensor, or a good one within the low spending budget I have for this project.
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