The 8B47K-05 is a linearized thermocouple-input module designed to interface with K-type thermocouples, converting temperature signals from 0°C to +1000°C to a 0V to +5V analog output. It provides 1500Vrms isolation, 120dB common-mode rejection, and 70dB normal-mode rejection at 60Hz, with cold junction compensation accurate to ±0.5°C at 25°C and ±1.5°C across the -40°C to +85°C operating range. Input protection supports continuous exposure to 240VAC, and transient protection complies with ANSI/IEEE C37.90.1. The module features a three-pole filter, upscale open thermocouple detection, and operates on +5VDC with a 30mA power draw. It measures 1.11" x 1.65" x 0.40" and is certified for Class I, Division 2 hazardous locations. Accuracy is ±0.15% of reading or ±1.50°C, inclusive of conformity, hysteresis, and repeatability. It meets DIN IEC 584, ANSI MC96-1-82, and JIS C 1602-1981 standards and is RoHS III compliant.
8B modules are an optimal solution for monitoring real-world process signals and providing high-level signals to a data acquisition system. Each 8B47 module isolates, filters, amplifies, and linearizes a single channel of temperature input from a thermocouple and provides an analog voltage output.
Linearization is accomplished using a four breakpoint piecewise linear approximation.
The 8B47 can interface to industry standard thermocouple types J, K, and T and has an output signal of 0 to +5V. Each module is cold-junction compensated to correct for parasitic thermocouples formed by the thermocouple wire and screw terminals on the mounting backpanel. Upscale open thermocouple detect is provided by an internal pull-up resistor.
Signal filtering is accomplished with a 3-pole filter optimized for time and frequency response which provides 70dB of normal-mode rejection at 60Hz. One pole of this filter is on the field side of the isolation barrier for anti-aliasing, and the other two are on the system side.
A special input circuit on the 8B47 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.
The modules are designed for installation in Class I, Division 2 hazardous locations and have a high level of immunity to environmental noise.
| Dataforth Corporation | |
|---|---|
| Product Category | Data Acquisition |
| Product Number | 8B47K-05 |
| Product Name | 8B47 Linearized Thermocouple Input Modules |
| Data Acquisition | Input Module |
| Form Factor | Modular Bay or Slot System |
| Outputs | Analog Voltage Output |
| User Interface | None |
| Application | General Lab & Industrial |
