Sensotec SC1000, Manual, Page: 10 / 62

page 10 008-0608-01
2.3 Wiring
2.3.1 Channel
Connector
The pin-out for the channel’s connector is shown in the following table.
The Analog Output and Analog Return pins are electrically isolated from all other pins
on the instrument.
Do not connect anything to the pins labeled as “N/C”. Damage to the instru-
ment or loss of accuracy may result.
2.3.2 4-Wire RTD
Connection
Use a 4-wire RTD connection when the highest possible accuracy is desired. The
excitation current from the instrument will be carried by two wires and the voltage drop
across the RTD will be sensed with the other two wires. Since the (+)Signal and (-
)Signal pins are high impedance inputs, there is little current flow through these wires
therefore the resistance of the wires doesn’t add to the resistance of the RTD.
Figure 2-1: “4-wire RTD Connection” to RTD Input Channel
Table 2-1: RTD Input Channel Pin Connections
Pin Label Function NOTES
1 (top) +EXC (+)Excitation referenced to pin 10
2 N/C N/C DO NOT CONNECT!
3 N/C N/C DO NOT CONNECT!
4 -EXC (-)Excitation referenced to pin 10
5 +SIG (+)Signal referenced to pin 10
6 -SIG (-)Signal referenced to pin 10
7 +OUT Analog Output referenced to pin 8
8 -OUT Analog Return -
9 N/C N/C DO NOT CONNECT!
10 DGND Digital Ground -
11 AUX1 Auxiliary Function 1
(connect to pin 10 to activate)
referenced to pin 10
12
(bottom)
AUX2 Auxiliary Function 2
(connect to pin 10 to activate)
referenced to pin 10