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Jim Baker
Joined: 30 Mar 2006
Posts: 181
Location: Sayre, PA
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 Posted: Fri Sep 15, 2006 3:49 pm Post subject: Temperature calibration..... |
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Anyone have any unique ways to accomplish a calibration of a
CHT sender/gauge at, say, 400F. I know about Tempilsticks and
Tempilaq and others of that ilk, plus the NIST certified
multimeteres (IR and contact) but wondered if there was
something else out there I might have missed....read that as
cheap. Tho, Tempil is about as cheap as you can get.....
Jim Baker
580.788.2779
Elmore City, OK
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nuckollsr(at)cox.net
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| Posted: Fri Sep 15, 2006 8:32 pm Post subject: Temperature calibration..... |
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At 02:06 PM 9/15/2006 -0500, you wrote:
| Quote: |
Anyone have any unique ways to accomplish a calibration of a
CHT sender/gauge at, say, 400F. I know about Tempilsticks and
Tempilaq and others of that ilk, plus the NIST certified
multimeteres (IR and contact) but wondered if there was
something else out there I might have missed....read that as
cheap. Tho, Tempil is about as cheap as you can get.....
Jim Baker
580.788.2779
Elmore City, OK
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Last time I did one was about 30 years ago. Bought
a nice fat 250W soldering iron used for copper roofing
work. Machined a replacement 'tip' that instead of a
chisel shape for soldering, it was cut off square, drilled
and tapped for a cht sensor. Drilled and tapped another
hole for attaching a thermocouple to the tip.
Used a variac to set the soldering iron's temperature.
This tool was quite handy for checking calibration of
a system right on the airplane.
You don't need a heater this big, the soldering iron
was available and accepted solid copper, 7/8" tips so
it was really easy to machine an adapter fitting out
of aluminum rod stock. As I recall, the variac ran at
about 50 volts to get 400F test temperatures.
A quick and dirty substitute for this technique might
be implemented by drilling and tapping an aluminum block
say 1 x 1 x 2 inches to accept the CHT sensor. Fit a thermocouple
to the block along with a ground wire to replace the
ground that is "lost" when the sensor is removed from
the cylinder head.
When the sensor is fitted, electrically grounded and
the thermocouple attached, use a small torch to heat
the block until the thermocouple reads 500F or so, then
wrap the whole assembly up in thick blanket of fiberglas
insulation. The cooling rate in this "padded" environment
will be very slow so that temperature of the sensor
will be closely matched to that of the thermocouple. Just track
the ship's CHT indicator trend against the thermocouple
readout as it cools.
Bob . . .
---------------------------------------------------------
< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >
---------------------------------------------------------
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Jim Baker
Joined: 30 Mar 2006
Posts: 181
Location: Sayre, PA
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| Posted: Fri Sep 15, 2006 8:50 pm Post subject: Temperature calibration..... |
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| Quote: | You don't need a heater this big, the soldering iron
was available and accepted solid copper, 7/8" tips
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With that much copper, I'm in danger of being knocked off for
drug money......
| Quote: | A quick and dirty substitute for this technique might
be implemented by drilling and tapping an aluminum block
say 1 x 1 x 2 inches to accept the CHT sensor. Fit a thermocouple
to the block along with a ground wire to replace the
ground that is "lost" when the sensor is removed from
the cylinder head.
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I can hack that....got a nice big chunk of round Al stock just sittin'
there awaiting the lathe. Thanks!
Jim Baker
580.788.2779
Elmore City, OK
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frank.hinde(at)hp.com
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| Posted: Sun Sep 17, 2006 7:19 pm Post subject: Temperature calibration..... |
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Boiling water is dead accurate at 220F if your within 1000ft of sea
level.
All of my Dynon probes were within a degree or 2.
Frank
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retasker(at)optonline.net
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| Posted: Sun Sep 17, 2006 7:43 pm Post subject: Temperature calibration..... |
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Unless you are on a different planet than the rest of us, water boils at
212 sea level.
Dick
Do not archive
Hinde, Frank George (Corvallis) wrote:
[quote]
Boiling water is dead accurate at 220F if your within 1000ft of sea
level.
All of my Dynon probes were within a degree or 2.
Frank
--
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Bob McC
Joined: 09 Jan 2006
Posts: 258
Location: Toronto, ON
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| Posted: Sun Sep 17, 2006 7:51 pm Post subject: Temperature calibration..... |
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Uh- - - don't you mean 212 degrees F ???????
Bob McC
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_________________
Bob McC
Falco #908
(just starting) |
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frank.hinde(at)hp.com
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