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- Currently I conduct an education tools for my university project. I build an simple subsonic-open circuit wind tunnel. I want to measure differential pressure in object inside the wind tunnel which under influence of low speed wind.

I assume that air have ##1 kg/m^3## density.

Therefore, using Bernoulli equation, on upside and downside of my test object, there is a differential pressure ##\Delta P##:

$$\Delta P=0.5*(v_2^2 - v_1^2)$$

From cases:

(a) ##v_1 = 1 m/s## and ##v_2 = 2 m/s##, then ##\Delta P = 1,5 Pa##

(b) ##v_1 = 10 m/s## and ##v_2 = 20 m/s##, then ##\Delta P=150 Pa##

I conclude that I need an instrument which can measure differential pressure from 0 up to 200 Pa with 0,1 Pa accuracy.

Could you suggest an instrumentation system that can cover my tasks? The constraints are in low production cost and availability sensors or tools in my country.

Therefore, using Bernoulli equation, on upside and downside of my test object, there is a differential pressure ##\Delta P##:

$$\Delta P=0.5*(v_2^2 - v_1^2)$$

From cases:

(a) ##v_1 = 1 m/s## and ##v_2 = 2 m/s##, then ##\Delta P = 1,5 Pa##

(b) ##v_1 = 10 m/s## and ##v_2 = 20 m/s##, then ##\Delta P=150 Pa##

I conclude that I need an instrument which can measure differential pressure from 0 up to 200 Pa with 0,1 Pa accuracy.

Could you suggest an instrumentation system that can cover my tasks? The constraints are in low production cost and availability sensors or tools in my country.

**[Mentor Note -- Poster's Profile Page lists Indonesia as his country]**
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