Siemens SITRANS T3K PA, Instruction Manual

Page: 85 / 130

Instruction Manual 7NG3213
SITRANS T3K PA
C79000-B7174-C55-04
85
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2 3
4
1
2
3
4
1
2 3
4
Resistance Resistance thermometer
Three-wire circuit
Difference/averaging circuit:
2 resistors can be programmed for
line compensation
Two-wire circuit:
Resistance for line
compensation programmable
RTD
RTD
RTD
Four-wire circuit
RTD2 RTD1
1)
1)
1)
1)
1)
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.
Two-wire circuit:
Resistance for line
compensation programmable
R
Three-wire circuit
R
R
Four-wire circuit
1)
Difference/averaging circuit:
2 resistors can be programmed for
line compensation
R2 R1
1
2
3
4
Figure 5 Sensor pin assignment