The Measurement Specialities sensors are $110, all I have to do is add 
the connector. The Freescale sensors are $11 + $2 for brass nipple + 
time to make the encapsulation and install the connectors. For the few 
pieces, actual cost isn't so much of an issue, than reliability. Yes the 
only failures are the sensors. I haven't done anything to the PIC board, 
which has a PIC 18F1320. There is a Freescale MPX5010G sensor and a 
LM335 temperature sensors also which have not been problems.

On the reliability, the PIC is >> fiberoptic RS-485 >> PLC that manages 
a 12.5KW standby generator, switching the fuel supply between the 
natural gas well, propane and gasoline depending what is available. If 
the generator fails, my basement could fill with water when the sump 
pump doesn't have power. That's expensive. Oh, and the PLC does have a 
water level switch on the sump, and will send an E-mail to my cell phone 
in case of high water level.

YES NOPE9 wrote:
>> I have a pressure sensor application, where I use Integrated pressure
>> sensors .....The system has been in operation for 4 years with 3  
>> failures.
>>     
>
>
> #1 How expensive is the failure ?  That is .... how much does it cost  
> to get the
> application working again ?
> #2 Are the only failures in the pressure sensors ?
>
> Gus
>
>
>   
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