Pyrometer

[one_dusty_hoot]

Jim, A pyrometer is a thrermocouple that develops
millivolts which a meter indicates in temperature.
The reading is not absolute but imperical in that
is a referrence temperature reading unless the
connecting wires are taken into account in calibration.
There has to be a return path whether it be the
frame ground or by wire. Using a wire for a return
path would give greater accuracy to the reading.
Possible the reason for supplying a 2 wire instead
of one? At your meter find where one wire went to
ground, connect one here the other to the other side
of the meter. Polarity has to be observed, so it you
have connected backwards the meter should delfect
downscale, if so, reverse connections.

Maybe your original pyrometer is not bad, just a bad
ground? Run a wire from a good ground at the thermocouple
to the point mentioned above.

My best guess on the subject, maybe someone who has
changed one will jump in here.
bob janes, '87fc35, greenville, sc


--- In WanderlodgeForum@yahoogroups.com, jim riordan
wrote:
>
> I could use some help. I have ab '88 WLWB with a detroit diesel
8v92. the pyrometer guage does not seem to be running at the correct
temp. I got earl to send me a new sending unit. The new sending unit
has two wires on it and the unit that is presently installed has only
one. I was wondering wheather anyone has any information on this.
>
> Jim Riordan
> '88 WLWB XXV
> Stuart, Fl.
>
>
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