7B34-02-1

Overview

The Analog Devices Inc. 7B34-02-1 is a single-channel signal conditioning module designed for industrial environments. It interfaces with two- or three-wire 100 Ω Platinum RTDs (α = 0.00385) over a temperature range of 0°C to +100°C. The module provides a precision linear output of +1 V to +5 V, with a maximum nonlinearity of ±0.05% span and accuracy of ±0.2% span. It operates on a nominal +24 VDC supply within a range of +14 VDC to +35 VDC, drawing a maximum current of 25 mA. Key electrical features include 1500 V rms galvanic isolation, a -3 dB bandwidth of 3 Hz, and input protection up to 120 V rms.

Feature Summary

• Amplifies, filters, and linearizes signals from 2- or 3-wire 100 Ω Platinum RTDs.
• Provides factory-configured +1 V to +5 V output linear with temperature.
• Features 1500 V rms continuous common mode voltage isolation and 160 dB CMR at 50/60 Hz.
• Includes 250 uA excitation current for RTD drive and open circuit indication.

Applications

• Industrial signal conditioning in process control systems.
• Factory-floor temperature monitoring and data collection.
• High-noise environments requiring galvanic isolation and filtering.

Procurement Notes

Verify the specific model suffix to confirm the required temperature range and output voltage configuration. The 7B34-02-1 is specifically configured for a 0°C to +100°C range with a +1 V to +5 V output. Ensure the host backplane supports the universal pin-out and that power supply voltages remain within the +14 VDC to +35 VDC operating window.

Selection Notes

Select this module when interfacing with 100 Ω Platinum RTs requiring a +1 V to +5 V output signal. Alternative models exist for different RTD types (Nickel, Copper), wider temperature spans, or 0 V to +10 V outputs. Consider the 3 Hz bandwidth limitation for dynamic signal requirements and verify compatibility with existing 7B Series backplanes.

Part Context

This component belongs to the 7B Series of signal conditioners, which are mix-and-match and hot-swappable modules. The series allows for flexible system expansion using rack-compatible hardware, such as the AC 1363 backplane, supporting up to 16 channels per unit.

Replacement Considerations

Direct replacements must match the 7B Series form factor and pin-out. Verify if other 7B34 variants (e.g., 7B34-01-1 for -100°C to +100°C) meet the specific application temperature requirements.

FAQ

What is the maximum nonlinearity specification for the 7B34-02-1?

The maximum nonlinearity is ±0.05% of span, calculated using the best-fit straight line method.

How does the module handle lead resistance errors?

The module provides three-wire lead resistance compensation, limiting the error effect to ±0.02°C per Ohm of lead resistance.

What is the input protection rating for the 7B34-02-1?

The three input pins are fully protected up to 120 V rms continuous line voltage and ±35 V dc continuous.