Partlow MIC 1161 - Rtd Lead Resistance

MIC 1161 Manual
14
AWG
NO.
10
12
14
16
18
20
24
J
.61
.97
1.57
2.47
4.00
6.43
15.80
K
1.54
2.41
3.86
6.09
9.90
15.51
39.44
T
.69
1.09
1.75
2.77
4.50
7.06
17.83
R
1.84
2.97
4.81
7.47
12.17
19.43
48.89
S
1.91
2.96
4.76
7.52
12.28
19.59
49.13
E
1.04
1.64
2.63
4.14
6.72
10.61
26.70
B
12.60
19.80
31.50
49.95
79.95
126.90
320.85
N
2.65
4.21
6.69
10.64
10.64
26.89
68.03
C
2.27
3.66
5.74
9.10
9.10
23.24
58.75
Thermocouple Type:
Temperature error in °F per 1000 feet of leadwire
TABLE 2
Example:
A instrument is to be located in a control room 660 feet away from the pro-
cess. Using 16 AWG, type J thermocouple, how much error is induced?
Terr = TLe * L
TLe = 2.47 (°F per 1000 ft) from Table 2
Terr = 2.47 (°F/1000 ft) * 660 ft
Terr = 1.6°F
RTD LEAD RESISTANCE
RTD lead length can affect instrument accuracy, since the size (gauge) and
length of the wire affect lead resistance.
To determine the temperature error resulting from the lead length resis-
tance, use the following equation:
Terr = TLe * L where; TLe = value from Table 3 if 3 wire RTD or
Table 4 if 2 wire RTD
L = length of lead wire in thousands of feet
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