The 5B Series provides a complete signal conditioning solution. A family of backplanes, pre-calibrated plug-in modules, direct sensor interface via screw terminal connections, high level outputs, and ribbon cable system interface result in easy integration into any system. For thermocouple applications, high accuracy cold junction compensation sensing is provided on each backplane channel. A general subsystem application is outlined in Figure 1.
The 5B Series can be easily tailored to meet each user's needs. These plug-in signal conditioners can be mixed and matched to provide I/O for various process sensors and actuators. Many standard configurations of each module are available, and for added flexibility, factory laser trimmed custom units can be supplied. A wide zero suppression capability allows a user to map any portion of the input signal into the full output span permitting improved system resolution within a selected measurement range.
The 5B Series was designed to assure maximum reliability under real-world conditions. The modules are specified over the -25°C to +85°C temperature range. Each module is potted; there are no adjustment potentiometers which could introduce mechanical and human errors that impair system integrity. All field wiring termination, including sensor inputs, excitation and current outputs, are protected against continuous 240 V rms line voltage. This prevents a fault from damaging the module, the backplane or other devices connected to the system. The modules also provide protection against high common mode voltages and are designed to meet the standards for transient voltage protection. Gold-plated pin and socket connections are used throughout the system to ensure connection reliability.
The high quality signal conditioning features include ±0.05% span initial accuracy, nonlinearity of only ±0.02% span, and chopper-based amplification which assures low drift (±1 µV/°C) and excellent long-term stability. Low drift sensor excitation is provided when required, and the model 5B34 RTD and model 5B47 thermocouple modules provide an output which is linear with input sensor temperature.
High Noise Rejection
The 5B Series modules were designed to accurately process low level signals in electrically noisy environments by providing 1500 V rms continuous of transformer-based isolation which eliminates ground loops, protects against transients and solves common-mode voltage problems. To further preserve signal integrity, 160 dB of common-mode rejection, 60 dB of normal mode rejection and excellent RFI/EMI immunity are provided.
Each 5B Series module measures only 2.275" x 2.325" x 0.595" resulting in space savings for both system designers and end users: each module occupies 1.35 square inches of board space and a 16-channel backplane occupies only 3.5" in a 19" rack.
Figure 1. Block Diagram of a General Measurement and Control Application Using the 5B Series