GE L90 Instruction Manual page 648

TRANSDUCER INPUTS/OUTPUTS
Settings are automatically generated for every channel available in the specific relay as shown above for the first channel
of a type 5C transducer module installed in the first available slot.
The function of the channel can be either "Enabled" or "Disabled." If "Disabled," there is not an actual value created for the
channel. An alphanumeric ID is assigned to the channel; this ID is included in the channel actual values. It is also used to
reference the channel as the input parameter to features designed to measure this type of parameter. Selecting the type of
RTD connected to the channel configures the channel.
Actions based on RTD overtemperature, such as trips or alarms, are done in conjunction with the FlexElements feature. In
FlexElements, the operate level is scaled to a base of 100°C. For example, a trip level of 150°C is achieved by setting the
operate level at 1.5 pu. FlexElement operands are available to FlexLogic for further interlocking or to operate an output
contact directly.
See the following table for reference temperature values for each RTD type.
Table 5-44: RTD temperature vs. resistance
Temperature
°C °F
–50 –58
–40 –40
–30 –22
–20 –4
–10 14
0 32
10 50
5
20 68
30 86
40 104
50 122
60 140
70 158
80 176
90 194
100 212
110 230
120 248
130 266
140 284
150 302
160 320
170 338
180 356
190 374
200 392
210 410
220 428
230 446
240 464
250 482
5-424
Resistance (in ohms)
100 Ω Pt 120 Ω Ni 100 Ω Ni
(DIN 43760)
80.31 86.17 71.81
84.27 92.76 77.30
88.22 99.41 82.84
92.16 106.15 88.45
96.09 113.00 94.17
100.00 120.00 100.00
103.90 127.17 105.97
107.79 134.52 112.10
111.67 142.06 118.38
115.54 149.79 124.82
119.39 157.74 131.45
123.24 165.90 138.25
127.07 174.25 145.20
130.89 182.84 152.37
134.70 191.64 159.70
138.50 200.64 167.20
142.29 209.85 174.87
146.06 219.29 182.75
149.82 228.96 190.80
153.58 238.85 199.04
157.32 248.95 207.45
161.04 259.30 216.08
164.76 269.91 224.92
168.47 280.77 233.97
172.46 291.96 243.30
175.84 303.46 252.88
179.51 315.31 262.76
183.17 327.54 272.94
186.82 340.14 283.45
190.45 353.14 294.28
194.08 366.53 305.44
10 Ω Cu
7.10
7.49
7.88
8.26
8.65
9.04
9.42
9.81
10.19
10.58
10.97
11.35
11.74
12.12
12.51
12.90
13.28
13.67
14.06
14.44
14.83
15.22
15.61
16.00
16.39
16.78
17.17
17.56
17.95
18.34
18.73
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS