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Pressure Switch - propane

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Old Jan 26, 2006 | 09:24 PM
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Default Pressure Switch - propane

I'm looking for a pressure switch for Propane. I need something around 150-170psi with the smallest working window I can find. 160 +/- 5 degrees would be great. Or doesn't anyone else have a different idea how to regulate propane pressure.
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Old Jan 26, 2006 | 09:41 PM
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This is a good area for Al.. I know he will have the answer.
Dave
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Old Jan 26, 2006 | 09:45 PM
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The NOS bottle heater uses thermastatic control and will heat your propane bottle to just the right temp and to about 160psi, it does this with 85* thermastats. It's the best most effective way for propane use. standard way as far as I know. Do a search on propane and you will find a thread with more propane info than any where else. Good luck, and you can pm me on any propane tech.
Robert
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Old Jan 26, 2006 | 10:13 PM
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Won't pressure change much with just a thermostat as propane weight drops?
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Old Jan 26, 2006 | 10:29 PM
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Originally Posted by b18c1hybrid
Won't pressure change much with just a thermostat as propane weight drops?
I forget the exact amount, but you'll see very little change in pressure at 85*. also you'll fill your nitrous bottle, many, many, many times before a refill is needed on your propane bottle, so pressure drop is so slow and mild, as to be a non issue.
Robert
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Old Feb 2, 2006 | 06:45 PM
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I got a NOS warmer and if I put the thermostat 180 degrees from the warmer mounted between the velcro and the bottle pressure gets over 200. If I put the thermostat behind the warmer pressure only gets to 130. I guess I'll keep playing with placement to get me in the 160 range.
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Old Feb 2, 2006 | 07:07 PM
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Originally Posted by b18c1hybrid
I got a NOS warmer and if I put the thermostat 180 degrees from the warmer mounted between the velcro and the bottle pressure gets over 200. If I put the thermostat behind the warmer pressure only gets to 130. I guess I'll keep playing with placement to get me in the 160 range.
That seems very strange. Eighty five degrees is 85*, and it should shut down. I have mine under the straps and it heats it to right where it should be, call NOS tech, maybe you have a faulty thermastat. Also, with propane you have a large window of tuning, meaning a propane jet of one size will be used for a wide range of hp (and only changing n2o jet). This can be seen in the bottle temps, with the middle ground of the jet list i have given in the past being at approx 160psi. So, if your a little bit above or below it won't really matter. Check your a/f by scanning to see for sure.
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Old Feb 2, 2006 | 10:40 PM
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I have my car setup for 150-165psi and with the pills I'm running dyno at 660/880 with high 11's AF. I'm just trying to get the pressure to stay consistant so I don't have to play with it every pass. Do you have your thermostat under the warmer or the strap? Does yours have 2 thermostats that you wire together?
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Old Feb 2, 2006 | 11:23 PM
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Two stats and under strap.
Robert
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Old Feb 3, 2006 | 07:06 AM
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We use to sell a heater kit made for the Propane tank that used a pressure transucder.
Real acurate, adjustable....Very slick.....Bad news is that we sold like two......LOL
Yes really.......We have not made one in about 4 years!

Wish I had one laying around.....

Dan
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Old Feb 5, 2006 | 11:25 PM
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Can you still get the pressure transducer or point me in the right direction.
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Old Feb 6, 2006 | 11:15 AM
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We were using our Nitrous pressure Gauge sending unit. Problem is that the sending unit uses very small voltages. Checkout MSI sensor in allied electric? I think they make a pressure sensor that will work with the propane. Problem is that the propane needs to use a fully sealed sesnor so a spark does not happen. They probably sell a pressure sensor with linear output @ 0-5V
You would need a circuit to control the heater...Not that easy to do...

Dan
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