Temp
°C
Platinum TCR 0.00385
Nickel TCR 0.00618
Copper
TCR
0.00427
Pt 100
Pt 250
Ni 100
Ni 120
Ni 250
Cu 10
60
123.24
308.1
135.3
162.36
338.25
11.352
70
127.07
317.675
141.7
170.04
354.25
-
80
130.89
327.225
148.3
177.96
370.75
12.124
90
134.7
336.75
154.9
185.88
387.25
-
100
138.5
346.25
161.8
194.16
404.5
12.897
120
146.06
365.15
176
211.2
440
13.669
140
153.58
383.95
190.9
229.08
477.25
14.442
150
-
-
198.6
238.32
496.5
-
160
161.04
402.6
206.6
247.92
516.5
15.217
180
168.46
421.15
223.2
267.84
558
-
200
175.84
439.6
240.7
288.84
601.75
-
3.13.2.10
RTD/mA input connection
RTD inputs can be used with a 2-wire or 3-wire connection with common ground.
When using the 3-wire connection, it is important that all three wires connecting the
sensor are symmetrical, that is, the wires are of the same type and length. Thus the
wire resistance is automatically compensated.
In the 2-wire connection, the lead resistance is not compensated. This scheme
may be adopted when the lead resistance is negligible when compared to the RTD
resistance or when the error so introduced is acceptable for the application in which
it is used.
3.13.2.11
RTD/mA card variants
The available variants of RTD cards are 6RTD/2mA and 2RTD/1mA. The features are
similar in both cards.
The available variants of RTD cards are 6RTD/2mA and 2RTD/1mA/3SO with an RTD
capability. The features are similar in both cards.
6RTD/2mA card
This card accepts two milliampere inputs and six inputs from the RTD sensors. The
inputs
1
and
2
are used for current measurement, whereas inputs from
3
to
8
are
used for resistance type of measurements.
RTD/mA input connection
Resistance and temperature sensors can be connected to the 6RTD/2mA board
with 3-wire and 2-wire connections.
1MRS757644 H
Basic functions
620 series
Technical Manual
125
