D8000-Series

Supported Applications

The Omega D8000 Series USB Data Acquisition Interface Modules are a family of complete data acquisition systems designed for process control applications. These modules support analog and digital I/O, featuring a USB interface that connects to a host computer to create a virtual serial port using the Modbus RTU protocol. The series is intended for use in process monitoring and control, data logging, and product testing.

Operating Conditions & Performance

The D8000 Series modules operate within an ambient temperature range of -25 to 70°C (-13 to 158°F) with a storage temperature range of -25 to 85°C (-13 to 185°F). Humidity ratings are specified as 0 to 95% RH non-condensing. The modules utilize an unregulated power supply of 10 to 30 Vdc.

Performance specifications vary by model type:

• Analog Input Resolution: 16-bit ADC for voltage, current, and thermocouple inputs (D8100–D8400).
• Analog Output Resolution: 12-bit DAC resolution with an update rate of 250 conversions per second.
• Digital I/O Update Rate: Digital outputs operate at a 4.5 Hz update rate.

Accuracy specifications for the series include ±0.05% of FS max, ±1.5°C max (J, K, T, E thermocouples), and ±3.5°C max (R, S, B, C thermocouples). The D8500 analog output module specifies an accuracy of ±0.1%. All user-selectable features are stored in nonvolatile EEPROM.

Configuration Options

The series encompasses a range of modules covering differential voltage inputs, current inputs, thermocouple inputs, combined input types, analog outputs, and digital I/O. The housing is constructed from ABS thermoplastic rated UL-94-5VA.

Input Modules (D8100–D8400)

The series includes 7-channel differential modules for specific or combined measurement types:

• D8100: Differential voltage inputs with selectable ranges including ±0.025V, ±0.05V, ±0.1V, ±1V, ±5V, and ±10V.
• D8200: Differential current input module for ±20 mA signals.
• D8300: Differential thermocouple inputs supporting types J, K, T, E, R, S, B, and C with ranges from -200 to 760°C (-328 to 400°F) up to 0 to 2315°C (32 to 4199°F).
• D8400: A combined module offering differential voltage, thermocouple, and current inputs with specifications equal to the D8100, D8200, and D8300 series.

Analog Output Module (D8500)

The D8500 provides two analog outputs programmable for voltage or current:

• Voltage Ranges: 0 to 10 Vdc, ±10 Vdc.
• Current Ranges: 0 to 20 mA, 4 to 20 mA.
• Isolation & Protection: Features 500 Vac isolation (output common to system ground) and current output burnout protection up to 250 Vac. Voltage output drive is limited to 5 mA max with a settling time of 1 mS to 0.1% FS.

Digital I/O Modules (D8710, D8720)

• D8710: Provides 15 digital inputs with internal 10K pull-up resistors. Logic "0" is defined as <1 Vdc and logic "1" as >3.5 Vdc, accepting direct switch closure.
• D8720: Offers 15 open-collector outputs rated to 30 Vdc at 100 mA max with short circuit protection up to 500 mA and a saturation voltage (Vsat) of +0.3 Vdc max at 100 mA.

Both digital modules feature 500 Vac isolation between the I/O common and system ground. Electrical connections are made via screw terminal barrier plugs supplied with the module.

Key Product Differences

The D8000 Series is differentiated by function-specific model numbers:

• D8100, D8200, D8300: Dedicated single-function input modules for voltage, current, and thermocouple respectively.
• D8400: A multi-input module combining the capabilities of the dedicated models into a single unit with 7 differential channels configurable as voltage, thermocouple, or current inputs.
• D8500: Dedicated analog output module supporting two programmable outputs (voltage or current).
• D8710, D8720: Digital input and digital output modules providing 15-bit I/O capabilities with specific logic levels and protection ratings.

The series supports DIN rail mounting via the optional DMK-1 kit. Communication is handled through a USB interface cable (OCW-1, 0.9 m / 3') which creates a virtual serial port for Modbus RTU communication with commercial data acquisition programs or host computers running Windows operating systems.