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ITS-90 PRTs calibrated to ITS-90 R(.01), a, b, c, d, a4, and b4
IEC751 PRTs (RTDs) conforming to IEC-751 none
CVD PRTs characterized by the Callendar-Van Dusen
equation
R0, Alpha, Delta, and Beta
YSI400 Thermistors matching the YSI-400 series none
THERM Thermistors characterized by the thermistor
polynomial
b0, b1, b2, and b3
Each of the conversion options is explained in the following sections along
with their associated coefficients, if they have any. The probe type and associ
-
ated coefficients are stored in the INFO-CON probe connector. Use the Up and
Down buttons to select the probe type and the ENT button to store and
continue.
Each of the coefficients that follow the probe type, if there are any, are set in
theusualway.UsetheUp and Down buttons to set each digit and the ENT but
-
ton to move to the next digit to the right. Press ENT when all digits are entered.
7.8.9 ITS-90
The ITS-90 type is for PRTs calibrated and characterized using the Interna-
tional Temperature Scale of 1990 equations. This type of probe generally has
excellent accuracy (0.005 to 0.025°C), a wide operating range (–180°C to
420°C or higher), but may be rather expensive. The coefficients that appear
when ITS-90 is selected are “R(.01)”, “a”, “b”, “c”, “d”, “a4", and ”b4".These
should be set to the coefficient values that appear on the PRT calibration certifi-
cate according to the following table.
Unused coefficients must be set to 0.
1521 Coefficients Certificate Value
R(.01) Rtpw
a a5, a6, a7, a8, a9, a10, or a11
b b5, b6, b7, b8 or b9
cc6orc7
dd
a4 a4 or a5
b4 b4 or b5
Consider the following examples.
Example 1:
1521 Handheld Thermometer Readout
User’s Guide
32