V_88:
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I didn't know I could do that. Well your 'karma points' are up now.
Hmmm... temperature sensor, now liquid flow meter... Just out of curiosity, what is the full project? An aquarium monitor? Hot water meter? Thermally triggered water cannon?
Temperature of the exhaust gas from a car. I need to measure the rpm of the wheel as well. So in all, the data I need to capture in real-time are :
- Temperature
- RPM of the wheel
- Flow rate of the exhaust gas
All these should be graphed simultaneously against time.
Hmmm... exhaust gas flow. Unless you have heard from others that that flow meter is suitable, I'd be concerned. It's rated as a water-flow meter, meaning that it is specifically engineered for a fluid with a similar viscosity to water. Gasses are significantly lower viscosity...
Also, exhaust gasses can be nasty to electronics. First, exhaust gasses are hot. Then, water vapor is a significant portion of exhaust. If allowed to condense the water can cause a whole range of problems, not just because it is liquid water, but also because the liquid water can dissolve other components of the exhaust gas and become caustic, which then can be hot which would increase the caustic reactivity. Additionally, you don't want a flow meter that will reduce your exhaust flow too much putting back-pressure on your engine. The actual flow of exhaust isn't a nice clean linear flow, it comes in pulses. You would need to have a flow meter that can handle the turbulence (either being fast enough to respond and then average it out in software or averages the pulses by design yet not give false reading if a resonant frequency is hit). Yes, the devil really is in the details...
So, you would need a gas-flow meter that can keep liquid water from reaching the electronics and can resist high temperatures and acids. It would need to be engineered for turbulent flow. I'm no expert at flow meters, but you may find something at Omega. You may also be able to get some help from their support staff (email or web-based online chat) to choose an appropriate flow sensor for your task.
I wish you good luck with your project.