OMB-DAQ-USB-2401

Supported Applications

The Omega OM-DAQ-USB-2401 is an 8/16-channel thermocouple and voltage input USB data acquisition module designed for portable data acquisition applications. The series supports user-programmable inputs for Type J, K, T, E, R, S, B, and N thermocouples or software-configurable voltage ranges from -30 to 30 mV up to ±10 V full scale.

Documented use cases include benchtop operation, DIN rail mounting in rack applications, or wall-mounted permanent installations. The module is designed for dry, moisture-free indoor environments only and includes built-in cold junction compensation and open thermocouple detection when channels are configured for thermocouple sensors.

Operating Conditions & Performance

The OM-DAQ-USB-2401 operates within an ambient temperature range of 0 to 50°C (32 to 122°F) and a relative humidity rating of 0 to 95% RH non-condensing. Storage temperatures are specified from -40 to 85°C (-40 to 185°F). The device provides 24-bit resolution with sequential measurement at approximately 1 ms per channel, achieving up to 1000 samples per second total across all active channels.

Performance specifications vary by input type and mode. In very slow mode (typical), thermocouple accuracy is listed as J = ±1.1°C, K = ±1.2°C, T = ±1.1°C, E = ±1.0°C, R = ±2.5°C, S = ±2.6°C, B = ±3.3°C, and N = ±1.5°C. Cold junction compensation accuracy is ±1.0°C.

Analog input accuracy in very slow mode (typical) is 0.015% of reading + 0.004% of range +10uV for differential inputs, and 0.05% of reading + 0.01% of range +50uV for single-ended inputs (exclusive of noise). The module provides 500 V isolation between the input channels and the PC.

Configuration Options

The series supports configurable channel types on a per-channel basis, allowing mixed thermocouple and voltage measurements within the same unit. Power is supplied directly from a USB port (max 500 mA) or via an optional external power adaptor rated +7.5 to +12 Vdc.

• Input Ranges: Thermocouples Type J (-18 to 1200°C), K (-129 to 1372°C), T (-101 to 400°C), E (-184 to 1000°C), R (204 to 1768°C), S (204 to 1768°C), B (538 to 1820°C), and N (-129 to 1300°C). Voltage inputs include -10 to 10V, -5 to 5V, -2.5 to 2.5V, -2 to 2V, -1 to 1V, -500 to 500 mV, -250 to 250 mV, -125 to 125 mV, -75 to 75 mV, and -30 to 30 mV.
• Excitation: Provides +12 Vdc regulated output with a maximum total current of 67 mA for sensor excitation.
• Connectivity: USB 2.0 full-speed interface compatible with USB 1.1 and USB 2.0 ports; supports up to 10 DAQ units per PC via self-powered or USB-powered hubs.
• Mounting Options: Includes hardware for wall mounting (drill holes 5.50 inches apart) or DIN rail mounting adaptors.

Key Product Differences

The OM-DAQ-USB-2401 is the primary model in this series, described as an 8/16-channel thermocouple/voltage input USB data acquisition module. The unit ships with Omega DAQ Central software and includes a mounting kit (screws, brackets, DIN rail adaptors), terminal blocks, a universal power adaptor, and two Type K insulated beaded wire thermocouples.

Accessory options available for the series include spare 1.83 m USB cables (OM-DAQ-USB-CABLE), spare 9 Vdc universal power adaptors (UNIV-AC-100/240), and additional terminal blocks (OM-DAQ-USB-TB). The device is not designed for medical or nuclear applications, nor should it be operated in flammable or explosive environments.