More DIY EGOR

[Bernd Felsche]

Bruce Plecan tapped away at the keyboard with:
> Here's is some more info..
> If you go experimenting on you own, be sure not to let the heater
> warm too quickly it can crack the inner workings of  the sensor

Anybody toyed with the idea of putting a thermocouple on the sensor
for temperature feedback to the heater amp in addition to using the
PTC of the element?

I was under the impression that the nominal operating temperature
was above 300C and under about 600C.  Am I wrong?

> And again please post here rather then email me.
> Cheers
> Bruce

>  > For the heater I have the resistance's  over a range of temps . All this
> equipment has up to date >calibrations The oven used is a lab quality Blue M
> oven. It has accuracy of +- 2 C  so please   >remember some error in reading
> is the fluctuations in temperature in chamber over time and >remember +-2C
> this would be worse case. I took this data to verify that my soft start
> would
> > work and not kill the heater and it looks that it will be ok.  The data
> can be charted and a equation >can be generated so you can project the
> resistance at any temperature . This means you can use it >as a EGT sensor
> as well. I can graph this data as well and give you the equation.  I don't
> think this
> >data is much help but it fills a hole in the spec. of this sensor.  Note
> each reading had 1/2 hour to >stabilize and with a weight of 90 grams and
> using the rule of thumb of 1 hour per lb . It was given >more than enough
> time to stabilize.
> 
> > Heater Data
> 
> >   Temp (C)            Resistance (Ohms)
> >             30                            3.13
> >             50                            3.34
> >             70                            3.56
> >             90                            3.77
> >           110                            3.98
> >           130                            4.17
> >           150                            4.37

-- 
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