REFLECTOR:CHT & EGT EXTENSIONS

[Wayne Lanza]

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Hi Mack,
  Sorry, but EGT/CHT thermocouples are not resistive probes but =20
"galvanic" devices, i.e. they emit a
voltage dependent upon temperature. Blue Mountain, in some cases uses a =20=

resistive CHT probe.
If the resistance is effected by the wiring it is easily calibrated out =20=

by the system settings - PLUS -
the nominal resistance of this type of probe is in the 40K to 60K ohm =20=

range. A few ohms of error introduced
by the wiring would be insignificant... I have worked with =20
thermo-resistive and thermocouple measurement
systems for over 25 years, this stuff isn't black magic. A word of =20
advise regarding thermocouples, avoid
grounded probes (ones where the junction is shorted to the probe case). =20=

They are most likely to cause
problems with measurements and typically have shorter service lives. =20
The best probes that I have used
are those made by Electronics International.

Wayne Lanza
________________________________________________________________________=20=

___________
On Wednesday, Feb 25, 2004, at 22:31 US/Eastern, MMurp16900@aol.com =20
wrote:

> I do not think you can change the length of the wires on none powered =20=

> egt cables the thermal cables must have the exact resistance.
> Only my opinion.
> Mack
> =A0

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Hi Mack,

 Sorry, but EGT/CHT thermocouples are not resistive probes but
"galvanic" devices, i.e. they emit a

voltage dependent upon temperature. Blue Mountain, in some cases uses
a resistive CHT probe.

If the resistance is effected by the wiring it is easily calibrated
out by the system settings - PLUS -=20

the nominal resistance of this type of probe is in the 40K to 60K ohm
range. A few ohms of error introduced

by the wiring would be insignificant... I have worked with
thermo-resistive and thermocouple measurement

systems for over 25 years, this stuff isn't black magic. A word of
advise regarding thermocouples, avoid

grounded probes (ones where the junction is shorted to the probe
case). They are most likely to cause

problems with measurements and typically have shorter service lives.
The best probes that I have used

are those made by Electronics International.


Wayne Lanza

=
__________________________________________________________________________=
_________

On Wednesday, Feb 25, 2004, at 22:31 US/Eastern, MMurp16900@aol.com
wrote:


<excerpt>I do not think you can change the length of the wires on none
powered egt cables the thermal cables must have the exact resistance.

Only my opinion.

Mack

=A0

</excerpt>=

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