Sensor Connections; Two Wire Sensors; Thermocouples; Voltage Wiring - Omega OM-DAQXL-1 Series User Manual

2
Hardware

2.6 Sensor Connections

This section shows how to connect sensors to your analog input terminals.
There are 8 or 16 analog input channels (depending on the model) each having
one positive terminal and one negative terminal clearly shown on the input
label. Depending on the type of sensor being connected 2 input channels may
be required. Input tables and figures are shown for each type of input. Bridged
based sensors (strain gages, load cells and mV output pressure transducers)
require excitation voltage which is provided on channels 1 and 2, 3 and 4,
9 and 10, 11 and 12 only. See tables 2-3 and 2-4 for wiring information.

2.6.1 Two wire sensors

For two wire sensors any open channel can be configured to read the sensor.
Any Channel
Sensor Type + –
Temperature Thermocouple TC+ TC-
Voltage V+ V-
Process
Current I+ I-

Table 2-3 Two wire sensor connections.

2.6.1.1 Thermocouples

For thermocouple sensors the negative lead is always colored red
(USA and Canada) or white (IEC 584-3).

Figure 2-10 Thermocouple Wiring Example

2.6.1.2 Voltage Wiring

Figure 2-11 DC Voltage Wiring Example
2-6