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OM-USB-TEMP User's Guide Sensor Connections
Pin Signal
Name
5
6
7
8
9
10
1
2
3
4
I1+
NC
C0H
C0L
4W01
IC01
C1H
C1L
GND
I1-
OM-USB-TEMP screw terminal descriptions
Pin Description
CH0/CH1 current excitation source
Not connected
CH0 sensor input (+)
CH0 sensor input (-)
CH0/CH1 4-wire, 2 sensor common
CH0/CH1 2-sensor common
CH1 sensor input (+)
CH1 sensor input (-)
Ground
CH0/CH1 current excitation return
Pin Signal
Name
31
32
33
34
35
36
27
28
29
30
I4-
GND
C7L
C7H
IC67
4W67
C6L
C6H
NC
I4+
Pin Description
CH6/CH7 current excitation return
Ground
CH7 sensor input (-)
CH7 sensor input (+)
CH6/CH7 2 sensor common
CH6/CH7 4-wire, 2 sensor common
CH6 sensor input (-)
CH6 sensor input (+)
Not connected
CH6/CH7 current excitation source
CJC sensor CJC sensor
I2+
NC
C2H
C2L
4W23
IC23
C3H
C3L
GND
I2-
+5V
GND
DIO0
DIO1
DIO2
DIO3
21
22
23
24
17
18
19
20
25
26
11
12
13
14
15
16
CH2/CH3 current excitation source
Not connected
CH2 sensor input (+)
CH2 sensor input (-)
CH2/CH3 4-wire, 2 sensor common
CH2/CH3 2 sensor common
CH3 sensor input (+)
CH3 sensor input (-)
Ground
CH2/CH3 current excitation return
+5V output
Ground
Digital Input/Output
Digital Input/Output
Digital Input/Output
Digital Input/Output
Use 16 AWG to 30 AWG wire for your signal connections.
47
48
49
50
43
44
45
46
51
52
37
38
39
40
41
42
I3-
GND
C5L
C5H
IC45
4W45
C4L
C4H
NC
I3+
+5V
GND
DIO7
DIO6
DIO5
DIO4
CH4/CH5 current excitation return
Ground
CH5 sensor input (-)
CH5 sensor input (+)
CH4/CH5 2 sensor common
CH4/CH5 4-wire, 2 sensor common
CH4 sensor input (-)
CH4 sensor input (+)
Not connected
CH4/CH5 current excitation source
+5V output
Ground
Digital Input/Output
Digital Input/Output
Digital Input/Output
Digital Input/Output
Tighten screw terminal connections
When making connections to the screw terminals, be sure to tighten the screw until tight. Simply touching the top of the screw terminal is not sufficient to make a proper connection.
Sensor input terminals (C0H/C0L to C7H/C7L)
You can connect up to eight temperature sensors to the differential sensor inputs (C0H/C0L to C7H/C7L).
Supported sensor categories include thermocouples, RTDs, thermistors, or semiconductor sensors.
Do not mix sensor categories within channel pairs. You can mix thermocouple types (J, K, R, S, T, N, E, and B) within channel pairs, however.
Do not connect two different sensor categories to the same channel pair
The OM-USB-TEMP provides a 24 bit A/D converter for each channel pair. Each channel pair can monitor one sensor category. To monitor a sensor from a different category, connect the sensor to a different channel pair
(input terminals).
Current excitation output terminals (±I1 to ±I4)
The OM-USB-TEMP has four dedicated pairs of current excitation output terminals (± I1 to ± I4 ). These terminals have a built-in precision current source to provide excitation for the resistive sensors used for RTD and thermistor measurements.
Each current excitation terminal is dedicated to one pair of sensor input channels:
I1+ is the current excitation source for channel 0 and channel 1
I2+ is the current excitation source for channel 2 and channel 3
I3+ is the current excitation source for channel 4 and channel 5
I4+ is the current excitation source for channel 6 and channel 7
12
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