Product Overview
The Allen-Bradley 1762-IT4 is a MicroLogix 1200 analog input module engineered for precise temperature measurement and millivolt signal acquisition. This four-channel thermocouple input module accepts a wide range of thermocouple sensors, including Types J, K, T, E, R, S, B, N, and C, as well as ±50 mV and ±100 mV signals. Its 15-bit resolution (plus sign) and Delta-Sigma conversion method ensure accurate and stable readings, making it a reliable choice for demanding industrial automation applications.
Key Features & Benefits
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4 Input Channels plus a Cold Junction Compensator (CJC) sensor for enhanced accuracy.
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15-bit resolution (plus sign) provides high precision in temperature and mV measurements.
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Programmable filter frequencies (10 Hz, 50 Hz, 60 Hz, 250 Hz, 500 Hz, 1 kHz) to stabilize readings and reduce noise.
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DIN rail mounting for easy installation beside MicroLogix 1200 controllers.
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Autocalibration performed during power-up ensures long-term accuracy.
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Open-type enclosure suitable for control cabinet environments.
Technical Specifications
| Parameter |
Value |
| Part Number |
1762-IT4 |
| Brand |
Allen-Bradley |
| Product Type |
Thermocouple/mV Input Module |
| Number of Inputs |
4 channels plus 1 CJC sensor |
| Compatible Thermocouple Sensors |
Type J, K, T, E, R, S, B, N, and C |
| Compatible Millivolt Signals |
-50…50 mV and -100…100 mV |
| Module Resolution |
15-bit (plus sign) |
| Converter Type |
Delta-Sigma |
| Filter Frequencies |
10 Hz, 50 Hz, 60 Hz, 250 Hz, 500 Hz, 1 kHz |
| Channel Update Time |
303 ms, 63 ms, 53 ms, 15 ms, 9 ms, 7 ms (corresponding to filter settings) |
| Current Draw @ 5.1V |
40 mA |
| Current Draw @ 24V |
50 mA |
| Heat Dissipation |
1.5 W max |
| Calibration |
Autocalibrates during power-up |
| CJC Sensor Accuracy |
±1.3 °C (±2.54 °F) |
| Operating Temperature |
0 to 55 °C (32 to 131 °F) |
| Storage Temperature |
-40 to 85 °C (-40 to 185 °F) |
| Vibration |
5g @ 10 to 500 Hz |
| Operating Shock |
30 g |
| Dimensions (H x W x D) |
3.54 in x 3.43 in x 1.58 in |
| Mounting |
DIN Rail |
| Enclosure |
Open-type |
| Product Line |
MicroLogix 1200 |
| UPC |
10611320861669 |
Applications
The 1762-IT4 excels in temperature monitoring and control across various industries. In plastic injection molding, it accurately reads thermocouples to maintain melt temperatures within tight tolerances. In food processing, it monitors oven and sterilization temperatures, ensuring product safety and quality. Additionally, in HVAC systems, it measures duct temperatures to optimize energy efficiency. Its ability to handle both thermocouple and millivolt inputs makes it versatile for transducer-based measurements as well.
Installation & Setup
Installation is straightforward. Mount the 1762-IT4 on a standard DIN rail next to the MicroLogix 1200 controller or other I/O modules. Use the snap-on lever on top to lock it in place. Connect thermocouple or millivolt signal wires using appropriate cabling (e.g., Belden 8761 for mV signals). Ensure proper polarity and differential wiring for each channel. After power-up, the module autocalibrates; configure channel filter frequencies and data formats via the controller's programming software to suit your application.
Maintenance & Reliability
Routine maintenance is minimal. Periodically inspect wiring connections for tightness and signs of corrosion. Keep the module free from dust and moisture, as it has an open-type enclosure. The autocalibration feature maintains accuracy over time, reducing the need for manual recalibration. Operating within the specified temperature and vibration limits ensures long service life and dependable performance.
Selection Guide & Purchasing Advice
Before purchasing, verify that the 1762-IT4 is compatible with your controller model and that your power supply can handle the current draw (40 mA @ 5.1V and 50 mA @ 24V). Consider the number of thermocouple inputs you need—this module offers four channels, which is ideal for applications requiring multiple temperature points. Ensure you have the correct thermocouple types and wiring accessories. For reliable sourcing, PLC Source PRO offers genuine Allen-Bradley parts with competitive pricing and fast delivery.