>
> On Feb 17, 2010, at 3:36 PM, Carl Denk wrote:
>
> 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.


Sorry...... I am not clear on this ..... is the Freescale sensor  
failing ?
Are you substituting for the Freescale ?   Exactly which sensors are
you having problems with ?
I was thinking that the encapsulation might case problems.  But of
course not if your substituted sensor model fails as well.

Gus
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