West Control Solutions MRC 5000 Controller Manual User Manual
Page 10
10
TABLE 1
Temperature error in
°
C per 1000 feet of Lead wire
AWG
Thermocouple Type:
No.
J
K
T
R
S
10
0.03
0.09
0.04
0.10
0.11
12
0.05
0.13
0.06
0.16
0.16
14
0.09
0.21
0.10
0.27
0.26
16
0.14
0.34
0.15
0.41
0.42
18
0.22
0.55
0.25
0.68
0.68
20
0.36
0.86
0.39
1.08
1.09
24
0.88
2.19
0.99
2.72
2.73
TABLE 2
Temperature Error in
°
F per 1000 feet of Lead wire
AWG
Thermocouple Type:
No.
J
K
T
R
S
10
0.06
0.15
0.07
0.18
0.19
12
0.10
0.24
0.11
0.30
0.30
14
0.16
0.39
0.18
0.48
0.48
16
0.25
0.61
0.28
0.75
0.75
18
0.40
0.99
0.45
1.22
1.23
20
0.64
1.55
0.71
1.94
1.96
24
1.58
3.94
1.78
4.89
4.91
For 3 wire RTDs, the instrument can virtually eliminate all lead wire resistance error.
Two wire RTDs should be used only with lead lengths less than 10 feet, unless special input calibration is performed using the
iCor (Input Correction) capability. (See Section 4 for setting iCor.) To determine the temperature error resulting from the lead
length resistance, use the following equation:
Terr = TRe x L
where;
TRe = temperature error in
°
C or
°
F per 1000 feet
L = length of lead wire in thousands of feet
TABLE 3
2 Wire RTD
AWG No.
Error
°
C
Error
°
F
10
+/-5.32
+/-9.31
12
+/-9.31
+/-14.6
14
+/-13.3
+/-23.9
16
+/-21.3
+/-38.6
18
+/-34.6
+/-61.2
20
+/-54.5
+/-97.1
24
+/-86.5
+/-155.6