B&R 7AT352.70 B&R 2003 Analog Input Module

Product Overview

The 7AT352.70 (7AT352.70) is a precision analog input module designed for integration into the B&R 2003 system. This unit provides two high-resolution inputs specifically configured for PT100 temperature sensors utilizing 3-wire connections. It is engineered to perform within an expansive sensing range of -200 to 850 deg C, making it suitable for critical thermal monitoring applications in power generation, chemical processing, and HVAC control systems. The module ensures reliable data acquisition to facilitate stable process control and prevent equipment failure caused by thermal excursions. Please note that this screw-in module requires the separate purchase of one TB712 terminal block for field wiring.

Technical Configuration

The 7AT352.70 architecture focuses on high-integrity signal conversion for resistance thermometers. By supporting 3-wire PT100 configurations, the module effectively compensates for lead wire resistance, ensuring measurement accuracy across long cable runs. The module is fully compliant with global industrial standards, featuring CE, UKCA, and EAC certifications, and is listed under cULus E115267 for industrial control equipment, guaranteeing its deployment readiness in North American and international markets. Its robust design allows for reliable operation in environments where high measurement precision and signal stability are mandatory requirements.

Technical Specifications

FAQs

Is the TB712 terminal block included with the module?

No, the TB712 terminal block is not included. It must be ordered separately to complete the installation of the 7AT352.70 module.

What is the primary benefit of the 3-wire connection for PT100 sensors?

The 3-wire configuration allows the module to measure and subtract the resistance of the lead wires, which significantly improves the accuracy of temperature readings compared to a 2-wire setup.

Does this module require special calibration?

The B&R 2003 series modules are factory-calibrated for their specified range. However, for high-precision applications, a system-level loop verification is recommended after installation.

Is this module suitable for harsh chemical environments?

While the module is built to industrial standards, the electronics should be housed in an appropriately rated enclosure to protect against direct exposure to corrosive chemicals or high humidity.

Wiring and Operational Guidelines

• Terminal Block Assembly: Ensure the TB712 terminal block is securely seated onto the module housing before attempting to wire the field sensors. Verify that the locking mechanism is engaged to prevent intermittent signal loss due to vibration.
• Lead Resistance Compensation: When wiring for 3-wire PT100 sensors, ensure that all three wires are of the same gauge and length. Discrepancies in wire resistance across the three leads can introduce measurement errors that the compensation logic may not fully resolve.
• Shielding Recommendations: To maintain signal integrity in electrically noisy environments, use shielded cables for all analog inputs. Connect the cable shield to the designated functional earth point within the control cabinet, ensuring the shield is not connected at the sensor end to avoid ground loops.