Refer to CRBasic Editor Help for specific PRTCalc() parameter entries. The
following information is presented as detail beyond what is available in CRBasic
Editor Help.
The general form of the Callendar-Van Dusen (CVD) equation is shown in the
following equations.
When R/R
0
< 1 (K = R/R
0
– 1):
T = g * K^4 + h * K^3 + I * K^2 + j * K
When R/R
0
>= 1:
T = (SQRT(d * (R/R
0
) + e) -a) / f
Depending on the code entered for parameter Type, which specifies the platinum-
resistance sensor type, coefficients are assigned values according to the following
tables.
Note Coefficients are rounded to the seventh significant digit to match the
CR1000 math resolution.
Alpha is defined as:
α = (R
100
– R
0
) / (100 • R
0
)
α = (R
100
/ R
0
– 1) / 100
where R
100
and R
0
are the resistances of the PRT at 100 °C and 0 °C, respectively.
Table 35. PRTCalc() Type-Code-1 Sensor
IEC 60751:2008 (IEC 751), alpha = 0.00385. Now internationally adopted and written into
standards ASTM E1137-04, JIS 1604:1997, EN 60751 and others. This type code is also used
with probes compliant with older standards DIN43760, BS1904, and others. (Reference: IEC
60751. ASTM E1137)
Constant Coefficient
a 3.9083000E-03
d -2.3100000E-06
e 1.7584810E-05
f -1.1550000E-06
g 1.7909000E+00
h -2.9236300E+00
i 9.1455000E+00
j 2.5581900E+02
236
To Next Page
Loading...
Need help?
General
