More DIY EGOR

[Pat Ford]

 Would it work to use the resistance of the heater to help stablize the temps? eg feed the heater from a constant current source? 

Previously, you (Bruce Plecan) wrote:
{ 
{ 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
{ 
{ 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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--
Pat Ford                           email: pford at qnx.com
QNX Software Systems, Ltd.           WWW: http://www.qnx.com
(613) 591-0931      (voice)         mail: 175 Terence Matthews          
(613) 591-3579      (fax)                 Kanata, Ontario, Canada K2M 1W8

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