Tony K used the original large version of 26PC01??? , now available as
26PC01SMT at both Mouser and Digikey.
Two important properties:
- temperature compensation for the range 0 to 50 degrees C
- fuel compatible (fluorosilicone seal I believe)
On 11/28/2013 1:18 AM, Andrew Sarangan wrote:
>
> I don't remember which chip TonyK used originally, but there are MEMS
> based membrane pressure sensors out there with 0.5 psi full scale (or
> even smaller scales). I plan to do this with a Atmel controller, and
> when I get around to it, I will post it here for everyone's benefit.
>
> Here is one:
> http://www.mouser.com/ProductDetail/Silicon-Microstructures-Inc/SM5852-003-G-3-NR/?qs=sGAEpiMZZMvhQj7WZhFIAE1JN4kSCAy2w%2fQb30WxsAg%3d
>
>
> On Wed, Nov 27, 2013 at 3:17 PM, Jan de Jong <jan_de_jong@casema.nl> wrote:
>>
>>
>> What has always puzzled me.
>> According to the specifications of the sensor the uncertainty in the initial
>> zero offset is +/- about 25 % of our full scale of 0.5 psi (35 cm of water).
>> Which in the general case would require a generous bias (using an opamp) to
>> the output of the instrumentation amplifier. Ofcourse, maybe Honeywell is
>> way too pessimistic in its specification. Tony K must have decided so?
>>
>> Jan de Jong
>>
>>
>> On 11/27/2013 7:30 PM, Paul McAllister wrote:
>>> Hello everyone,
>>>
>>> I have been using this in my aircraft since 2004. Tony K did the original
>>> design work and it is based on a PIC micro processor. It is calibrated in
>>> 1/10th increments from empty to full and displays on a 10 segment LED or an
>>> analogue display.
>>>
>>> There isn't any PCB design and most people who have built them seemed to
>>> have trouble in getting them up an running. It's not complex to build but
>>> they do require a bit of tinkering to get them working, installed and
>>> calibrated. In my case I set up a water manometer on my bench to get it
>>> debugged and working.
>>>
>>> The only issue I have had is that despite having a static vent on the
>>> differential side, the gauge does read high when climbing and low when
>>> descending and it takes a few minutes to stabilize in these scenarios. It
>>> hasn't been enough of a problem for me to bother with trying to fix it.
>>> Other than this it has functioned reliably for the last 9 years.
>>>
>>> I use this in conjunction with my fuel totalizer and I do not have a sight
>>> gauge.
>>>
>>> I do have the source code so I could burn some PIC's for people, but
>>> before doing this I will need Tony K's permission. I guess if there was
>>> enough interest I could create a PCB design and build a batch of them. I
>>> will need to think on this some more before I sign up for this. :)
>>>
>>> Regards, Paul
>>>
>>
>>
>>
>>
>
>
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