A PRT was calibrated to ITS-90 and its calibration certificate states values for
coefficients R(273.16K), a4, b4, a8, and b8. Set the 1521 coefficients to the
certificate values as follows.
1521 Coefficients Certificate Value
R(.01) R(273.16K)
aa8
bb8
c0.0
d0.0
a4 a4
b4 b4
Example 2:
A PRT was calibrated to ITS-90 and its calibration certificate states values for
coefficients R(273.16K), a5, and b5. Set the 1521 coefficients to the certificate
values as follows.
1521 Coefficients Certificate Value
R(.01) R(273.16K)
aa5
bb5
c0.0
d0.0
a4 a5
b4 b5
7.8.10 IEC751
The IEC-751 probe type is for standard PRTs (RTDs) conforming to the
IEC-751 or DIN-43760 standards. This type of probe is generally low cost and
has a wide operating range (–180°C to 420°C or higher), but has limited accu
-
racy (0.15°C to 4°C). There are no user programmable coefficients associated
with this probe type.
7.8.11 CVD
The CVD (Callendar-Van-Dusen) type is used with PRTs that have unique cal
-
ibration coefficients or do not match the IEC-751 specification. This type of
