2 compute r0 and alpha 40, Compute r0 and alpha, 2 compute r0 and alpha – ThermoWorks 9103 HART SCIENTIFIC FIELD DRY-WELL TEMPERATURE CALIBRATORS User Manual
Page 42
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B
T
T
=
−
3
2
C
T
T
T
T
= ⎡
⎣⎢
⎤
⎦⎥
−
⎡
⎣⎢
⎤
⎦⎥
− ⎡
⎣⎢
⎤
⎦⎥
−
⎡
⎣⎢
⎤
⎦
4
4
3
3
100
1
100
100
1
100 ⎥
D
T
T
T
T
= ⎡
⎣⎢
⎤
⎦⎥
−
⎡
⎣⎢
⎤
⎦⎥
− ⎡
⎣⎢
⎤
⎦⎥
−
⎡
⎣⎢
⎤
⎦
3
3
2
2
100
1
100
100
1
100 ⎥
E
R
R
=
−
4
3
F
R
R
=
−
3
2
delta
AF
BE
DE
CF
=
−
−
T
1-4
- Measured temperature using thermometer.
R
1-4
- Value of R from display of 9103 (Press SET and DOWN at the same
time.)
where
T
1
and R
1
are the measured temperature and resistance at –25°C
T
2
and R
2
are the measured temperature and resistance at 0°C
T
3
and R
3
are the measured temperature and resistance at 60°C
T
4
and R
4
are the measured temperature and resistance at 125°C
10.2.2
Compute R0 and ALPHA
a
T
delta
T
T
1
2
2
2
100
1
100
=
+
⎡
⎣⎢
⎤
⎦⎥
−
⎡
⎣⎢
⎤
⎦⎥
a
T
delta
T
T
3
4
4
4
100
1
100
=
+
⎡
⎣⎢
⎤
⎦⎥
−
⎡
⎣⎢
⎤
⎦⎥
rzero
R a
R a
a
a
=
−
−
4
1
2
3
1
3
alpha
R
R
R a
R a
=
−
−
2
4
4
1
2
3
delta is the new value of DELTA computed above.
9103 Dry-Well
User’s Guide
40
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