Analog Devices Inc. 5B47-S-10-NI

Overview

5B47-S-10-NI from Analog Devices is a single-channel, isolated, linearized thermocouple input signal conditioner for Type S thermocouples (+500°C to +1750°C), delivering 0 V to +5 V isolated output with ±2.4°C accuracy, 1500 V_rms continuous isolation, and 4 Hz bandwidth. It integrates cold-junction compensation, chopper-stabilized amplification (±1 µV/°C input offset drift), and 240 V_rms input protection for industrial temperature monitoring.

For engineers reviewing the 5B47-S-10-NI datasheet, 5B47-S-10-NI pinout, 5B47-S-10-NI application, or 5B47-S-10-NI equivalent, key selection considerations include its certified Class 1 Division 2 nonincendive rating, FM/CSA approvals, hot-swappable 5B-series compatibility, and precise linearized output for high-temperature furnace control and metallurgical process instrumentation.

Technical Context

The 5B47-S-10-NI implements transformer-based galvanic isolation with proprietary modulation for stable linear signal transfer, paired with internal cold-junction compensation using an on-board sensor to achieve ±0.25°C CJC accuracy at +25°C ambient. Its chopper-stabilized input amplifier ensures low-drift performance critical for long-term thermal stability in unattended systems.

It features multi-pole low-pass filtering (4 Hz –3 dB cutoff) delivering 60 dB normal-mode rejection at 60 Hz and 160 dB common-mode rejection with 1 kΩ source imbalance. The differential field-side input is fully floating-no input grounding required-and includes active open-thermocouple detection with upscale fail-safe response.

Key Specifications

Pinout & Package

Package: 2.275" × 2.375" × 0.595" (57.8 mm × 59.1 mm × 15.1 mm) potted module with standardized 5B-series footprint and screw-terminal field interface.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar thermocouple signal conditioning applications.

Compared with 5B47-S-10 and ADAM-4018, the 5B47-S-10-NI uniquely combines certified nonincendive operation, transformer-based 1500 V_rms isolation, and hardware linearization-making it the only option qualified for direct mounting in Class 1 Div 2 hazardous locations with uncompromised analog precision.

Availability

5B47-S-10-NI is available at Aetrix Electronics and suitable for industrial furnace monitoring, metallurgical process control, and refinery catalyst bed sensing requiring stable component supply, long-lifecycle support, and certified hazardous-area compliance.

Supply support for 5B47-S-10-NI includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, communications, automotive, and consumer markets since 1965.

The 5B Series was engineered specifically for rugged industrial signal conditioning-delivering transformer-isolated, linearized, and protected analog interfaces for thermocouples, RTDs, and voltage/current sensors in harsh, safety-critical environments.

FAQ

What is the purpose of the "-NI" suffix in 5B47-S-10-NI?

The "-NI" suffix indicates nickel-plated input screw terminals, which provide enhanced corrosion resistance for reliable long-term contact in high-humidity, chemically aggressive, or saline environments such as offshore platforms, refineries, or food processing plants. This plating prevents oxidation-induced resistance drift and maintains stable thermocouple connections-critical for maintaining the ±2.4°C accuracy of the 5B47-S-10-NI over decades of service.

Does 5B47-S-10-NI require external cold-junction compensation?

No. The 5B47-S-10-NI includes fully integrated, factory-calibrated cold-junction compensation (CJC) using an on-board sensor, achieving ±0.25°C accuracy at +25°C ambient. It automatically corrects for parasitic thermocouple voltages formed at the screw terminals, eliminating the need for external CJC hardware or software compensation-ensuring the full ±2.4°C system accuracy specification of the 5B47-S-10-NI is met out-of-the-box.

Can 5B47-S-10-NI be used in Class 1, Division 2 hazardous locations?

Yes. The 5B47-S-10-NI is FM and CSA certified for Class 1, Division 2, Groups A, B, C, and D-meaning it is approved for installation in areas where flammable gases may be present only under abnormal conditions. Its nonincendive design ensures no spark or thermal ignition hazard exists during normal operation, allowing direct use in control cabinets without additional explosion-proof enclosures-fully satisfying NEC Article 500 requirements for the 5B47-S-10-NI.

What is the maximum allowable common-mode voltage for 5B47-S-10-NI?

The 5B47-S-10-NI supports up to 1500 V_rms continuous common-mode voltage between field input and computer output sides. However, the output common must remain within ±3 V of the power supply common-exceeding this violates safe operating limits and risks damage. This constraint ensures signal integrity and protects downstream ADCs or PLC inputs when using the 5B47-S-10-NI in grounded measurement systems.

How does the 5B47-S-10-NI handle an open thermocouple condition?

The 5B47-S-10-NI detects open thermocouple circuits and responds with a predictable upscale output (>+5 V) within 10 seconds-providing immediate, unambiguous fault indication to the host system. No external components are needed; this behavior is inherent to the 5B47-S-10-NI's internal circuitry. For downscale response instead, a 20 MΩ resistor can be installed across terminals 1 and 3-a configurable feature unique to the 5B47-S-10-NI architecture.