need cheap pressure sensor
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From: lektric.dan on 20 May 2010 23:28 I'm working on a project to help develop a solar powered water pump. The pump is called a fluidyne, essentially a liquid piston Sterling engine. You can find more about the project here: http://www.iedu.com/DeSoto/Fluidyne/ What I would like to do is build a small fluidyne that I can put a specific, controlled amount of heat into, and measure the results. I'd like to find a source for (very) inexpensive pressure sunsors. They need to be able to measure very small pressures (50 cm water pressure). I've got all kinds of interface circuitry, so I can measure a sensor that uses a strain gauge (in whatever configuration), simple resistance changes, piezoelectric, or whatever. Any ideas or sources?
From: Sjouke Burry on 21 May 2010 00:07 lektric.dan(a)gmail.com wrote: > I'm working on a project to help develop a solar powered water pump. > The pump is called a fluidyne, essentially a liquid piston Sterling > engine. You can find more about the project here: > http://www.iedu.com/DeSoto/Fluidyne/ > What I would like to do is build a small fluidyne that I can put a > specific, controlled amount of heat into, and measure the results. > I'd like to find a source for (very) inexpensive pressure sunsors. > They need to be able to measure very small pressures (50 cm water > pressure). I've got all kinds of interface circuitry, so I can > measure a sensor that uses a strain gauge (in whatever configuration), > simple resistance changes, piezoelectric, or whatever. Any ideas or > sources? Washing machines waterlevel sensors. Taken from old machines they are very cheap. The water level is about what you want.
From: George Herold on 21 May 2010 10:13 On May 20, 11:28 pm, "lektric....(a)gmail.com" <lektric....(a)gmail.com> wrote: > I'm working on a project to help develop a solar powered water pump. > The pump is called a fluidyne, essentially a liquid piston Sterling > engine. You can find more about the project here:http://www.iedu.com/DeSoto/Fluidyne/ > What I would like to do is build a small fluidyne that I can put a > specific, controlled amount of heat into, and measure the results. > I'd like to find a source for (very) inexpensive pressure sunsors. > They need to be able to measure very small pressures (50 cm water > pressure). I've got all kinds of interface circuitry, so I can > measure a sensor that uses a strain gauge (in whatever configuration), > simple resistance changes, piezoelectric, or whatever. Any ideas or > sources? I've used Honeywell 24PC and 26PC series sensors's $15 and $23 each.. is that cheap? I'm not sure if they work in fluids. George H.
From: lektric.dan on 21 May 2010 13:51 On May 20, 11:07 pm, Sjouke Burry <burrynulnulf...(a)ppllaanneett.nnll> wrote: > > Washing machines waterlevel sensors. > Taken from old machines they are very cheap. > The water level is about what you want. Are these sensors that give a continuous indication of water level, or just a switch that senses when water has reached correct level? Seems to me that they would just use a switch.
From: Baron on 21 May 2010 15:53
lektric.dan(a)gmail.com Inscribed thus: > On May 20, 11:07 pm, Sjouke Burry <burrynulnulf...(a)ppllaanneett.nnll> > wrote: > >> >> Washing machines waterlevel sensors. >> Taken from old machines they are very cheap. >> The water level is about what you want. > > Are these sensors that give a continuous indication of water level, or > just a switch that senses when water has reached correct level? Seems > to me that they would just use a switch. You're right, they are just switches. A diaphragm operates a microswitch. -- Best Regards: Baron. |