Rimas VisGirda on sat 5 nov 11
Thermocouple output is not linear across an entire temperature spectrum, co=
nsequently TC's are calibrated to the temperature range that is intended to=
measure. In other words, if you calibrate your instrument to room temperat=
ure it will be "off" at 1900F (c/05) and more so at 2350F (c/10). If you wa=
nt it to be accurate at a certain cone put that cone into your kiln and vis=
ually determine the amount of bend that you want to denote the desired temp=
erature. There will be a small screwdriver slot on your gauge face, with a =
screwdriver adjust the needle to that temperature. Your TC is now calibrate=
d for that cone temperature; which may be moot depending on the accuracy of=
your gauge. Mine shows the smallest division as 25F, I figure I can estima=
te to 5F pretty easily. This means that my readout will be +/- 5F at my des=
ired temp... -Rimas
Rimas VisGirda on sat 5 nov 11
Hi ho Steve, My information is 50 years old from my science daze in pre-dig=
ital times... and it doesn't have to do with wear, it has to do with the pr=
operties of the system to generate emf due to a temperature difference, whi=
ch shouldn't matter whether it's an analog or digital readout... The bottom=
line is analogous to the scale discussion of some weeks past, the precisio=
n of available instruments is usually much higher than needed in the potter=
y studio... -Rimas
Hi Rimas,
I think you'll find that anomaly relates exclusively to analogue meters whi=
ch need to be re-calibrated fairly regularly anyway because of mechanical w=
ear, digital ones are normally self adjusting provided they are matched to =
the Thermocouple.
Steve M
Steve Mills
Bath
UK
www.mudslinger.me.uk
Sent from my Ipod touch
On 5 Nov 2011, at 14:58, Rimas VisGirda wrote:
> Thermocouple output is not linear across an entire temperature spectrum, =
consequently TC's are calibrated to the temperature range that is intended =
to measure. In other words, if you calibrate your instrument to room temper=
ature it will be "off" at 1900F (c/05) and more so at 2350F (c/10). If you =
want it to be accurate at a certain cone put that cone into your kiln and v=
isually determine the amount of bend that you want to denote the desired te=
mperature. There will be a small screwdriver slot on your gauge face, with =
a screwdriver adjust the needle to that temperature. Your TC is now calibra=
ted for that cone temperature; which may be moot depending on the accuracy =
of your gauge. Mine shows the smallest division as 25F, I figure I can esti=
mate to 5F pretty easily. This means that my readout will be +/- 5F at my d=
esired temp... -Rimas
Steve Mills on sun 6 nov 11
Hi Rimas,
I think you'll find that anomaly relates exclusively to analogue meters whi=
c=3D
h need to be re-calibrated fairly regularly anyway because of mechanical we=
a=3D
r, digital ones are normally self adjusting provided they are matched to th=
e=3D
Thermocouple.=3D20
Steve M
Steve Mills
Bath
UK
www.mudslinger.me.uk
Sent from my Ipod touch
On 5 Nov 2011, at 14:58, Rimas VisGirda wrote:
> Thermocouple output is not linear across an entire temperature spectrum, =
c=3D
onsequently TC's are calibrated to the temperature range that is intended t=
o=3D
measure. In other words, if you calibrate your instrument to room temperat=
u=3D
re it will be "off" at 1900F (c/05) and more so at 2350F (c/10). If you wan=
t=3D
it to be accurate at a certain cone put that cone into your kiln and visua=
l=3D
ly determine the amount of bend that you want to denote the desired tempera=
t=3D
ure. There will be a small screwdriver slot on your gauge face, with a scre=
w=3D
driver adjust the needle to that temperature. Your TC is now calibrated for=
t=3D
hat cone temperature; which may be moot depending on the accuracy of your g=
a=3D
uge. Mine shows the smallest division as 25F, I figure I can estimate to 5F=
p=3D
retty easily. This means that my readout will be +/- 5F at my desired temp.=
.=3D
. -Rimas
| |
|
