● Provides gain and excitation for strain gage-based transducers (load cells, pressure sensors, torque meters, etc.) ● Interfaces to 100Ω Thru 2kΩ Full-Bridge Strain Gages (model dependent) ● High Level Voltage Outputs ● 1500Vrms Transformer Isolation ● ANSI/IEEE C37.90.1 Transient Protection ● Input Protected up to 240VAC Continuous ● 100dB CMR ● 3Hz or 8kHz Signal Bandwidth ● ±0.05% Accuracy ● ±0.02% Linearity ● Low Drift with Ambient Temperature ● UL, CSA, FM and CE Certifications Pending ● Mix and Match Modules
DI-8B modules are an optimal solution for monitoring real-world process signals and providing high level signals to a data acquisition system. Each DI-8B38 module isolates, filters and amplifies a full-bridge strain gage input signal and provides an analog voltage output.
The 8B38 can interface to tranducers with a nominal resistance of 100Ω to 2kΩ depending upon the model. Bridge excitation is provided from the module with a stable 10.00V or 3.33V source. Full scale sensitivities of 2mV/V and 3mV/V are offered as standard.
Signal filtering is accomplished with a five-pole filter optimized for time and frequency response which provides 100dB per decade of normal-moderejection above the filter cutoff frequency. One pole of this filter is on the field side of the isolation barrier for anti-aliasing, and the other four are on the system side.
A special input circuit on the DI-8B38 module provides protection against accidental connection of power-line voltages up to 240VAC. Clamp circuits on the I/O and power terminals protect against harmful transients.
Isolation is provided by optical coupling to suppress transmission of common mode spikes or surges. The module is powered from +5VDC, ±5%.
The modules are designed for installation in Class I, Division 2 hazardous locations and have a high level of immunity to environmental noise.
