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The ABB CTI 21-P Ex, identified by the product ID 3BDH000741R1, is a Temperature Input Module designed for industrial automation systems. It offers a comprehensive set of features and capabilities for temperature measurement applications. Here are the key features and specifications based on the provided sources:

32 Analog/Temperature Inputs: The module supports 32 inputs, with the ability to configure channels in a 2-conductor switch for analog inputs and a 3/4-conductor switch for temperature inputs. This flexibility allows for a wide range of applications.

Process Current Circuits: Compliant with EN 50020, the module includes protection circuits for Ex ib IIC, ensuring safety in environments with a risk of explosion.

Galvanic Separation: Features central galvanic separation through an opto-coupler and functional channel-wise galvanic separation through a relay multiplexer, enhancing the safety and reliability of the module.

16-Bit A/D Transformer: Utilizes a 16-bit A/D transformer for precise temperature measurement.

Redundancy Capability: The module is capable of redundancy, offering increased reliability in critical applications.

Sensor Types: Supports a variety of sensor types including resistance thermo-meters (Pt 100 and Ni 100), thermocouples, and thermocouples with resistance sensors. It also allows for freely selectable freestyle characteristics for resistance measurement and voltage measurement.

Technical Data: Includes specifications for input voltage ranges, input resistance, response threshold for line break, A/D transformation type, and damping at power frequency. It also details the module's protection intrinsic safety, ex-relevant open-circuit voltage, ex-relevant short-circuit current, and voltage supply specifications.

ABB CTI 21-P Ex | 3BDH000741R1 CT121Ex |Temperature input module.

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