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SKU:1746-NT8
Allen-Bradley 1746-NT8 | SLC 500 Thermocouple Input Module 8-Ch
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.
Ytterligere spesifikasjoner
Skalar (V/f)
Vektor
AC-drevet
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For mer informasjon, vennligst se vår Frakt- og returpolicy.

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