The 3B34 Rev. 0 is an isolated, linearized RTD input module that amplifies, linearizes, and protects analog input voltages from a wide variety of two-, three-, and four-wire Resistor Temperature Detectors (RTDs). The module provides a constant +10V bridge excitation voltage and simultaneous precision voltage and current outputs linear to input temperature. RTD excitation current and three-wire lead resistance compensation provide a complete signal conditioning solution. The module circuitry can withstand 220V rms at the input screw-terminals. All 3B34 series modules are mix-and-match and Hot Swappable.
The 3B34 is a single‑channel signal‑conditioning module that isolates, amplifies, linearizes and protects analog input voltages from RTDs. It provides simultaneous precision voltage (0‑+10 V) and current (4‑20 mA) outputs, with up to +1500 V peak isolation and input protection up to 220 V rms.
The module is hot‑swappable, mix‑and‑match compatible, and can be calibrated via front‑panel zero and span adjustments. Various models support different sensor types and temperature ranges, and specifications include low drift, high accuracy, and robust ESD protection.
| Input Bias Current | 3 nA |
|---|---|
| Input Resistance | 15 MΩ |
| Noise (Input, 0.1 Hz‑10 Hz) | 0.2 µV rms |
| Common‑Mode Isolation Voltage | +1500 V peak |
| Accuracy (Initial) | ±0.1 % Span |
| Nonlinearity | ±0.05 % Span |
| Rated Temperature Range | -28 °C to +85 °C |
| Power Supply Voltage | +15 V dc |
The module provides up to +1500 V peak isolation between the input and output.
It offers a voltage output of 0 to +10 V and a current output of 4‑20 mA (or 0‑20 mA).
The input bias current is 3 nA.
The rated performance temperature range is –28 °C to +85 °C.