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b=4.6354171E03, c=-1.2531030E05, and d=-6.2365913E06. Set the 1504 pa
-
rameters with values from the certificate as follows.
Example 2:
A thermistor’s calibration certificate gives coefficients a=-4.2501569E00,
b=3.8997001E03, and c=-1.4225654E07. Set the 1504 parameters with values
from the certificate as follows.
6.4.4 Callendar-Van Dusen (RTD) Conversion
The RTD conversion uses the Callendar-Van Dusen equation:
[]
()
rt C
Rt
tt
t
Rt
°=
+− −
⎛
⎝
⎜
⎞
⎠
⎟
⎡
⎣
⎢
⎤
⎦
⎥
⎧
⎨
⎩
⎫
⎬
⎭
≥
+
0
0
1
100 100
10
1
αδ
α
−−
⎛
⎝
⎜
⎞
⎠
⎟
−−
⎛
⎝
⎜
⎞
⎠
⎟
⎛
⎝
⎜
⎞
⎠
⎟
⎡
⎣
⎢
⎤
⎦
⎥
⎧
δβ
tt t t
100 100
1
100
1
100
3
⎨
⎩
⎪
⎫
⎬
⎭
<
⎧
⎨
⎪
⎪
⎩
⎪
⎪
t 0
The coefficients R
0
, α, β ,andδ can be set by the user. They are indicated as
“r0”, “ALPHA”, “bEtA”, and “dELtA” on the display. For IEC-751 or
DIN-43760 sensors, the coefficients for “r0”, “ALPHA”, “bEtA”, and
“dELtA” should be 100.0, 0.00385, 1.507, and 0.111 respectively.
Some probes may be provided with A, B, and C coefficeints for the
Callendar-Van Dusen equation in the following form:
21
6 General Operation
Selecting the Probe Characterization
1504 Coefficient Certificate Value
b0 a
b1 b
b2 0
b3 c
Table 3 Setting Coefficients a, b, and c
1504 Coefficient Certificate Value
b0 a
b1 b
b2 c
b3 d
Table 4 Setting Coefficients a, b, c, and d