Bob:

Yes, it was not a zero tempco sensor! I will have to look up the lab
notes and get back to you. The sensor was used over a narrow temperature
range of 25¡C +/- 10¡C and the buffered solution compensated some. Also
the PIC lookup table did first order linearization and tempco
correction. Ah the power of these little chips.

If one needs sensor operation over a large temperature range - the
capacitive version would a better solution but the sensor and circuitry
would be larger.

- Wayne Foletta
BMI - Saratoga, CA

> ----------
> From:         Bob Blick[SMTP:bob@TED.NET]
> Reply To:     pic microcontroller discussion list
> Sent:         Thursday, January 22, 1998 12:15 PM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: inclinometer
> 
> > pulsed mode of operation. The wire was 36 GA nichrome. The
> electrolyte
> > was ethylene glycol  with 2 mg NaCl and 50 mg Borax per 1000 cc.
> 
> Hi Wayne,
> 
> What sort of resistance did you get with that combination? The
> Fredricks
> and Spectron sensors are about 1K Ohm, and the temperature spec is
> huge. I
> suppose with ethylene glycol, yours would be also.
> 
> Cheers,
> 
> Bob
>