Siemens 7NG3213 Betriebsanleitung Seite 85

Instruction Manual
Resistance
1)
3
4
Two-wire circuit:
Resistance for line
compensation programmable
3
1)
4
Three-wire circuit
3
4
Four-wire circuit
1)
3
4
R2
Difference/averaging circuit:
2 resistors can be programmed for
line compensation
The measured value is applied at logic channel 1. In difference and averaging circuit the
measured value calculation is determined by the measuring type (see section "Measuring
type coding" on the next page). You can get the measured values of the single channels
from the secondary variables channel 1 and 2.
1)
Attention !
Fit short-circuit bridges on the system side on site.
Figure 5 Sensor pin assignment
SITRANS T3K PA
C79000-B7174-C55-04
2
1
R
2
1
R
2
1
R
2
1
R1
Resistance thermometer
1)
3
4
RTD
Two-wire circuit:
Resistance for line
compensation programmable
1)
3
4
RTD
Three-wire circuit
3
4
RTD
Four-wire circuit
1)
3
4
RTD2 RTD1
Difference/averaging circuit:
2 resistors can be programmed for
line compensation
7NG3213
2
1
2
1
2
1
2
1
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