3-1
Chapter 3
Sensor Connections
The USB-TEMP supports the following temperature sensor types:
!
Thermocouple – types J, K, R, S, T, N, E, and B
!
Resistance temperature detectors (RTDs) – 2, 3, or 4-wire measurement modes of 100
Ω
platinum
RTDs.
!
Thermistors – 2, 3, or 4-wire measurement modes.
!
Semiconductor temperature sensors – LM36 or equivalent
Sensor selection
The type of sensor you select will depend on your application needs. Review the temperature ranges and
accuracies of each sensor type to determine which is best suited for your application.
Screw terminal pin out
The USB-TEMP has four rows of screw terminals — two rows on the top edge of the housing, and two
rows on the bottom edge. Each row has 26 connections. Between each bank of screw terminals are two
integrated CJC sensors used for thermocouple measurements. Signals are identified in Figure 3-1.
I1+
1
NC
2
C0
H
3
C0
L
4
4W
0
1
5
IC01
6
C1
H
7
C1
L
8
GN
D
9
I1-
10
I2+
11
NC
12
C2
H
13
C2
L
14
4W
2
3
15
IC23
16
C3
H
17
C3
L
18
GN
D
19
I2-
20
+5
V
21
GN
D
22
DI
O
0
23
DI
O
1
24
DI
O
2
25
DI
O
3
26
27
I4-
28
GND
29
C7L
30
C7H
31
IC67
32
4W67
33
C6L
34
C6H
35
NC
36
I4+
37
I3-
38
GND
39
C5L
40
C5H
41
IC45
42
4W45
43
C4L
44
C4H
45
NC
46
I3+
47
+
5V
48
GND
49
DIO7
50
DIO6
51
DIO5
52
DIO4
C
JC S
e
nsor
CJC
Sensor
Figure 3-1. USB-TEMP screw terminal pin numbers
