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1746-NT8

Allen-Bradley 1746-NT8 | SLC 500 Thermocouple Input Module 8-Ch

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  • Manufacturer: Allen-Bradley

  • Product No.: 1746-NT8

  • Product Type: Thermocouple Input Module

  • Product Origin: USA

  • Payment:T/T, Western Union

  • Weight: 340g

  • Shipping port: Xiamen

  • Warranty: 12 months

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Product Overview

The Allen-Bradley 1746-NT8 is an 8-channel Thermocouple/mV Analog Input Module for the SLC 500 system. It accepts J, K, T, E, S, R, B, and N thermocouple types, as well as ±50mV and ±100mV signals. This module delivers 16-bit resolution with Sigma-Delta conversion for precise temperature measurement.

Core Functionality

The 1746-NT8 converts analog thermocouple or millivolt signals to digital values for SLC 500 processors. It features automatic calibration every 2 minutes, selectable filter frequencies, and open-circuit detection (zero, upscale, or downscale). Two cold-junction compensation sensors on the 1746-RT34 terminal block ensure accurate temperature readings. The module supports engineering units, PID-scaled, or proportional counts data formats.

Technical Specifications

Parameter Value
Part Number 1746-NT8
Series SLC 500
Module Type Thermocouple/mV Analog Input
Inputs 8 channels
Thermocouple Types J, K, T, E, S, R, B, N
Millivolt Inputs ±50mV, ±100mV
Resolution 16-bit in / 14-bit out
A/D Conversion Sigma-Delta modulation
Update Time 356ms to 4.05s
Backplane Current (5V / 24V) 120mA / 70mA
Backplane Power 2.28W max
Input Impedance >10MΩ
Overvoltage Protection ±30V DC (600W pulse)
Isolation (Input to Backplane) 500V DC for 1 min
Open Circuit Detection Zero / Upscale / Downscale
CJC Accuracy ±1.72°C
Operating Temperature 0°C to 60°C
Weight 0.34 kg (0.75 lbs)

Installation Guide

Install the 1746-NT8 in any SLC 500 chassis slot except Slot 0 (reserved for CPU or communication adapters). Connect thermocouple or millivolt sensors using the 1746-RT34 removable terminal block. The terminal block includes two CJC sensors. Ensure input devices have impedance under 100Ω for rated accuracy. Configure input type and data format (engineering units, PID-scaled, or proportional counts) in the SLC 500 program.

Engineering Advantages

This module supports eight thermocouple types plus millivolt inputs, offering flexibility for diverse temperature measurement applications. Sigma-Delta conversion with programmable filtering provides noise rejection >100dB at 50-60Hz. Automatic calibration ensures long-term accuracy. Open-circuit detection with selectable response helps identify sensor faults. The module fits both fixed and modular SLC 500 systems.

Technical FAQs

Q1: Supported thermocouple types?
A1: J, K, T, E, S, R, B, and N. Also supports ±50mV and ±100mV inputs.

Q2: Where to install the module?
A2: Any SLC 500 chassis slot except Slot 0. Slot 0 is reserved for processor or communication adapters.

Q3: Update time and resolution?
A3: Update time 356ms to 4.05s (filter dependent). Resolution 16-bit in / 14-bit out.

Product Resources

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🏷️ Tags: Thermocouple Input Module

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