Temperature vs. Resistance Tables for
Resistance Temperature Detectors (RTD) 1
Figure 1 ¾ Pyromations Standard Element Connections
2-wire single 2-wire dual 3-wire single 3-wire dual 4-wire single 4-wire dual
Page 1
List of Tables
Following is a list of the resistance temperature
detectors tables included in this reference manual.
Table Type
alpha Range
27
Limits of Error
28 Classification of Tolerances
29
Pt
Platinum
a=0.00385
-200 to 660 °C
30
Pt
Platinum
a=0.00385
-328 to 1220 °F
31
Pt
Platinum
a=0.00392
-200 to 660 °C
32
Pt
Platinum
a=0.00392
-328 to 1220 °F
33
Cu
Copper
a=0.00427
-200 to 260 °C
34
Cu
Copper
a=0.00427
-328 to 500 °F
35
Ni
Nickel
a=0.00672
-80 to 260 °C
36
Ni
Nickel
a=0.00672
-112 to 500 °F
37
Ni-Fe Nickel-Iron a=0.00518
-200 to 204 °C
38
Ni-Fe Nickel-Iron a=0.00518
-328 to 400 °F
This reference manual consists of reference
tables
that
give
temperature
vs.
resistance
relationships for resistance temperature detectors for
Platinum, Copper, Nickel, and Nickel-Iron sensors.
These tables give ohm values from one to three
decimal places for each degree of temperature. Such
tables are satisfactory for most industrial uses but
may not be adequate for computer and similar
applications. If greater precision is required, the
reader should contact the manufacturer for equations
which permit easy and unique generation of the
temperature vs. resistance relationship.
1 All temperature vs. resistance data in Tables 29
to 36 have been developed from wire manufacturers
data.
Table 28 ¾ Classification of Initial Tolerances2
Use given equations to calculate tolerances at
specified temperatures:
A = ± [ 0.03 + 0.0017 çt ç] °C
B = ± [ 0.08 + 0.0017 çt ç] °C
C = ± [ 0.26 + 0.0042 çt ç] °C
where:
ç t ç = value of temperature without regard to
sign, °C.
Note 2 ¾ The equations represents values for 3-wire and 4-wire
PRT's.Caution must be excercised with 2-wire PRT's due to lead wire.
Table 27 ¾ Limits of Error for RTDs
Initial Tolerance @ 0 °C
Type ± 0.01% ± 0.03% ± 0.1% ± 0.2% ±0.5%
Pt
·
A
·
B
·
C
Cu
·
Ni
·
Ni-Fe
·
A, B, C
see Table 28