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From: Grant on 21 May 2010 17:36
On Fri, 21 May 2010 07:13:21 -0700 (PDT), George Herold <gherold(a)teachspin.com> wrote:

>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.

Like the washing machine sensors, they's work with pressurised a
column of air from the pipe down to the bottom of the tub, no?

Grant.
--
http://bugs.id.au/
From: Jim Thompson on 21 May 2010 17:40
On Sat, 22 May 2010 07:36:38 +1000, Grant <omg(a)grrr.id.au> wrote:

>On Fri, 21 May 2010 07:13:21 -0700 (PDT), George Herold <gherold(a)teachspin.com> wrote:
>
>>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.
>
>Like the washing machine sensors, they's work with pressurised a
>column of air from the pipe down to the bottom of the tub, no?
>
>Grant.

Yep, But I've never quite understood how they maintain any accuracy...
I guess � a couple of inches is OK ?:-)

...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

The only thing bipartisan in this country is hypocrisy
From: Sjouke Burry on 21 May 2010 17:47
lektric.dan(a)gmail.com wrote:
> 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.

Yep.
From: Grant on 21 May 2010 18:07
On Fri, 21 May 2010 14:40:14 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon(a)On-My-Web-Site.com> wrote:

>On Sat, 22 May 2010 07:36:38 +1000, Grant <omg(a)grrr.id.au> wrote:
>
>>On Fri, 21 May 2010 07:13:21 -0700 (PDT), George Herold <gherold(a)teachspin.com> wrote:
>>
>>>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.
>>
>>Like the washing machine sensors, they's work with pressurised a
>>column of air from the pipe down to the bottom of the tub, no?
>>
>>Grant.
>
>Yep, But I've never quite understood how they maintain any accuracy...
>I guess ± a couple of inches is OK ?:-)

On my washing machine there's a position to far clockwise labeled
'Reset', but I've never dismantled one to see how they work :)

Grant.
--
http://bugs.id.au/
From: Jim Thompson on 21 May 2010 18:17
On Sat, 22 May 2010 08:07:43 +1000, Grant <omg(a)grrr.id.au> wrote:

>On Fri, 21 May 2010 14:40:14 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon(a)On-My-Web-Site.com> wrote:
>
>>On Sat, 22 May 2010 07:36:38 +1000, Grant <omg(a)grrr.id.au> wrote:
>>
>>>On Fri, 21 May 2010 07:13:21 -0700 (PDT), George Herold <gherold(a)teachspin.com> wrote:
>>>
>>>>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.
>>>
>>>Like the washing machine sensors, they's work with pressurised a
>>>column of air from the pipe down to the bottom of the tub, no?
>>>
>>>Grant.
>>
>>Yep, But I've never quite understood how they maintain any accuracy...
>>I guess � a couple of inches is OK ?:-)
>
>On my washing machine there's a position to far clockwise labeled
>'Reset', but I've never dismantled one to see how they work :)
>
>Grant.

Same here. I have no idea, but my curiosity is tweaked :-)

...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

The only thing bipartisan in this country is hypocrisy
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