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In Topic: Smoke screen
18 September 2012 - 10:57 PM
how about a powder fire extinguisher filled with TiO2 thats basically what TiClO4 is doing, as its not vaporised as its boiling point is 2972 Celsius, its just airisolizing the TiO2 by product.
In Topic: Smoke screen
18 September 2012 - 10:26 PM
This will be a standing part of a security system to make theft more difficult.
Alarms sounds, lights go out and property fills with smoke.
So it will have to be reusable, I'm toying with the idea, of replacing the water in a water fire extingisher, pressurising it again and attaching a coil of copper with a nichrome wire wrapped around the pipe to heat.
Idea being if I can have a long enough hot enough pipe to pass the glycol through it will be a very high flow smoke machine.
Alarms sounds, lights go out and property fills with smoke.
So it will have to be reusable, I'm toying with the idea, of replacing the water in a water fire extingisher, pressurising it again and attaching a coil of copper with a nichrome wire wrapped around the pipe to heat.
Idea being if I can have a long enough hot enough pipe to pass the glycol through it will be a very high flow smoke machine.
In Topic: Smoke screen
18 September 2012 - 09:51 PM
I have discussed TiClO4 and Tin tetrachloride with my brother (who asked me to design the system).
And we have decided the same thing, just build a big arse smoke machine using the glycol smoke fluids.
I'm thinking copper pipe wrapped in nichrome wire should provide enough heat with a high volume pump.
And we have decided the same thing, just build a big arse smoke machine using the glycol smoke fluids.
I'm thinking copper pipe wrapped in nichrome wire should provide enough heat with a high volume pump.
In Topic: electronics help
07 March 2012 - 09:34 AM
i was going to reply, but it would seem digger said everything i was going too. lol
the only thing you could add is a low side current sensing op amp, basically it measures the voltage drop over a resistor and you can use the output to drive your relay. idea being when the current supplied is below say 50mA the output is low and if it above its high.
here's a quick link i found but I'm sure there more out there to give a better description.
Current sensing op amp.
the only thing you could add is a low side current sensing op amp, basically it measures the voltage drop over a resistor and you can use the output to drive your relay. idea being when the current supplied is below say 50mA the output is low and if it above its high.
here's a quick link i found but I'm sure there more out there to give a better description.
Current sensing op amp.
In Topic: rate of reaction
29 February 2012 - 09:25 AM
Assuming that your bus bar has a perfectly clean surface you may be able to offer some theories, in reality there will be many surface contaminants -fingerprints, grease, natural oxide formations etc which will form their own environmants for local corrosion issues, so theory may differ dramatically from practise! Remember also that bus bars carry current so generate heat, so as the current varies the temperature will vary, with temperature variation there could be a condensation - evaporation cycle to mess with your surface condition assumptions.
we can assume the busbars aren't being used and i would assume surface contamination such as finger prints would create localised issues, for this instance im more interested in a rough average time per square inch for the reaction to take place.
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