More DIY EGOR

Mon Nov 20 09:57:46 GMT 2000

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> -----Original Message-----
> From: 944 at technologist.com [mailto:944 at technologist.com]
> Sent: Monday, November 20, 2000 10:29 AM
> To: diy_efi at diy-efi.org
> Subject: Re: More DIY EGOR
> 
> 
> Am I understanding this correctly? The goal of the heater is 
> to maintain the
> heater element at a constant resistance (say 3.5 ohms) . If 
> the resistance
> of the heater remains constant, than the heating element is 
> assumed to be
> keeping the sensor at a constant temperature. Is that correct?

Sorry for jumping in, normally I only lurk

No, at constant resistance it would dissipate a constant number of watts.
When ambient temp rises the temp of the heater would rise too. The
temperature would remain constant if the heater has a PTC effect. When
temperature rises, resistance rises too, decreasing dissipated power. This
way self-destruction of the heater is prevented.

JJ

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&gt; -----Original Message-----
 &gt; From: 944 at technologist.com [<A =
HREF=3D"mailto:944 at technologist.com">mailto:944 at technologist.com</A>]</F=
ONT>
 &gt; Sent: Monday, November 20, 2000 10:29 AM
 &gt; To: diy_efi at diy-efi.org
 &gt; Subject: Re: More DIY EGOR
 &gt; 
 &gt; 
 &gt; Am I understanding this correctly? The goal of =
the heater is 
 &gt; to maintain the
 &gt; heater element at a constant resistance (say =
3.5 ohms) . If 
 &gt; the resistance
 &gt; of the heater remains constant, than the =
heating element is 
 &gt; assumed to be
 &gt; keeping the sensor at a constant temperature. =
Is that correct?

<P><FONT SIZE=3D2>Sorry for jumping in, normally I only lurk</FONT>
</P>

No, at constant resistance it would dissipate a =
constant number of watts. When ambient temp rises the temp of the =
heater would rise too. The temperature would remain constant if the =
heater has a PTC effect. When temperature rises, resistance rises too, =
decreasing dissipated power. This way self-destruction of the heater is =
prevented.

<P><FONT SIZE=3D2>JJ</FONT>
</P>

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