Product Summary
The Allen-Bradley 1762-IT4 serves as a high-accuracy analog input module for the MicroLogix 1200 platform. This module directly connects four thermocouple sensors or millivolt sources to your controller. It delivers precise temperature measurement for industrial process control applications.
Theme Option A: Product Procurement & Buyer Guide
Core Compatibility and Sensor Support
The 1762-IT4 works exclusively with MicroLogix 1200 controllers. It accepts nine thermocouple types including J, K, T, and E. You can also wire Type R, S, B, N, and C sensors directly. This module also reads ±50 mV and ±100 mV signals. This flexibility reduces the need for separate signal conditioners.
Resolution and Signal Conversion
This module uses a Sigma-Delta converter for stable data. It provides a 15-bit plus sign resolution for each channel. This high resolution ensures you capture fine temperature changes. The module autocalibrates during power-up to maintain long-term accuracy. This feature eliminates manual calibration routines in the field.
Environmental and Mechanical Specifications
The 1762-IT4 operates reliably in temperatures from 0 to 55 °C. It withstands vibration up to 5g at 10 to 500 Hz. The open-type enclosure requires installation in a suitable cabinet. You mount the module on a standard DIN rail. Its dimensions are 3.54 x 3.43 x 1.58 inches. This compact size saves valuable panel space.
Power and Heat Dissipation
This module draws 40 mA from the 5.1V bus and 50 mA from the 24V bus. Its maximum heat dissipation is only 1.5 Watts. This low power consumption reduces the load on your system power supply. It also minimizes heat buildup inside your control cabinet.
Filtering and Update Times
You can select from six programmable filter frequencies. Options include 10 Hz, 50 Hz, 60 Hz, 250 Hz, 500 Hz, and 1 kHz. Each filter frequency provides a specific channel update time. For example, the 10 Hz filter gives a 303 ms update. The 1 kHz filter provides a fast 7 ms update. Choose the filter that balances noise rejection with speed.
Cold Junction Compensation Accuracy
The built-in CJC sensor ensures accurate temperature readings. It offers an accuracy of ±1.3 °C (±2.54 °F). This compensation is critical for precise thermocouple measurements. It automatically corrects for the temperature at the connection terminals.
Wiring and Cable Recommendations
Use differential input wiring for all thermocouple and mV signals. For millivolt signals, Belden 8761 cable is the recommended choice. Always use appropriate thermocouple extension wire for your sensor type. Proper wiring prevents signal degradation and noise interference.
Theme Option D: Expert Technical Evaluation & Performance Review
Measurement Range and Data Formats
The 1762-IT4 measures temperatures from -210 °C to 2315 °C. This range covers extreme industrial processes. The module outputs data in several configurable formats. You can select engineering units x1 or x10. Other options include scaled-for-PID, percent of full scale, and raw data. This variety simplifies integration with your control logic.
Dynamic Performance and Noise Rejection
The programmable notch filter provides excellent noise rejection. You can tune it to suppress 50 Hz or 60 Hz line noise. This capability is vital for stable readings in electrically noisy environments. The Sigma-Delta conversion method further enhances signal integrity. It oversamples the input to achieve high effective resolution.
Operational Shock and Vibration Tolerance
The module withstands operating shock of 30 g. This ruggedness ensures reliable performance in demanding industrial settings. It also survives storage temperatures from -40 to 85 °C. This wide range allows for safe storage in non-climate-controlled areas.
Calibration and Accuracy Verification
The module performs an autocalibration routine every time it powers up. This process ensures the CJC and ADC circuits are within spec. You do not need to send the module out for periodic calibration. This feature reduces maintenance downtime and total cost of ownership.
Logistics & Standard Packaging Details
- One Allen-Bradley 1762-IT4 thermocouple input module
- One installation and user manual
- One static-safe packaging bag
- No bus connector or mounting hardware included
- Express shipping available via FedEx, UPS, and DHL
