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Detailed Parameters Table
| Parameter Name | Parameter Value |
| Product model | CTI 21 P Ex 3BDH000741R1 |
| Manufacturer | ABB |
| Product category | Temperature Input Module (I/O) |
| Input channels | 16 or 32 (configurable for analog or temperature inputs) |
| Sensor support | Thermocouples (T/J/E/K/R/S/B/N), RTD (Pt100/Ni100), mV/V, PTC/NTC |
| Safety certification | ATEX Zone 2 (II (2) G Ex ib IIC Gb; EN 60079 0, EN 60079 11) |
| Isolation | Channel-wise galvanic isolation, opto-coupler isolation |
| ADC resolution | 16 bit A/D with linearization, cold-junction, line-resistance compensation |
| Temperature range | RTD: –200 °C to +850 °C; Thermocouple: –50 °C to +1820 °C |
| Mounting | ABB Symphony Plus rack or compatible system backplane |
| Operating temperature | –20 °C to +60 °C |
| Protection rating | IP20 (cabinet interior) |
Product Introduction
The CTI 21 P Ex 3BDH000741R1, commonly known as CTI 21 P Ex, is an ABB-certified temperature and analog input module engineered for hazardous-area use within the Symphony Plus distributed control system. With options for 16 or 32 highly-configurable channels, the CTI 21 P Ex 3BDH000741R1 supports diverse sensor types—from thermocouples and RTDs to millivolt, voltage, and resistor sensors—making it a versatile choice for process temperature acquisition in industrial environments .
Designed to meet rigorous safety requirements, the CTI 21 P Ex 3BDH000741R1 is certified as Ex ib IIC Gb, enabling safe rack mounting in ATEX Zone 2 installations. It delivers precise measurements with 16-bit resolution, featuring linearization, cold-junction, and line-resistance compensation. Channel-level isolation and full galvanic separation ensure signal integrity and reliable performance in demanding settings like oil & gas, chemical, power, and refining plants .
ABB 3BDH000741R1 CTI 21-P Ex
Core Advantages and Technical Highlights
Versatile input configuration:
With 16 or 32 universal channels, the CTI 21 P Ex 3BDH000741R1 caters to thermocouples, RTDs, analog, and resistor sensors—offering unmatched flexibility for varied process requirements .
Intrinsic safety & isolation:
Ex ib IIC certification and per-channel galvanic isolation via opto relays safeguard measurement loops in hazardous zones without external barriers .
High accuracy and compensation:
16-bit ADC with linearization, cold-junction, and line-resistance correction ensures high-precision temperature readings across wide ranges .
Redundancy-ready:
Supports redundant configuration and hot-backup modes, making it pivotal in critical control installations requiring no single point of failure .
Robust environmental performance:
Engineered for –20 °C to +60 °C operation with durable IP20 enclosure suitable for industrial rack interiors .
Typical Application Scenarios
The CTI 21 P Ex 3BDH000741R1 excels in process temperature measurement across ATEX Zone 2 environments, such as chemical reactors, refining units, power generation turbines, and offshore facilities. Its wide sensor support and intrinsic safety compliance allow direct field wiring from thermocouples and RTDs without intermediate isolation devices.
In systems requiring redundancy, the module fits into dual pathways, enabling hot-standby operation. Its precision and compensation capabilities ensure reliable temperature feedback—essential for regulatory reporting, product quality control, and operational safety.
ABB 3BDH000741R1 CTI 21-P Ex
Related Model Recommendations
CTI 21 P 3BDH000740R1 – Non-Ex version of the same temperature input module for safe-area installations.
CTI 21 V 3BDH000742R1 – Voltage/current analog input module for non-thermal analog signals.
CTI 21 RT 3BDH000743R1 – RTD-only input module optimized for precise resistance temperature detection.
CIT 31 P Ex 3BDH000745R1 – Compact 8-channel temperature input module for rack space savings.
CTI 21 F Ex 3BDH000746R1 – Field-mount version with IP66 enclosure for outdoor process zones.
Installation, Commissioning and Maintenance Instructions
Installation Preparation:
Shut down power to the Symphony Plus rack. Ensure ATEX cable glands and barrier continuity per ABB installation guide. Slot the CTI 21 P Ex 3BDH000741R1 into the rack and torque sensor wiring as specified. Maintain clearance for tubing and cable paths.
Commissioning & Maintenance:
Power-up and verify module status via Symphony Plus HMI. Use engineering software to assign input types, configure compensation, and set alarm limits. For redundant setups, validate auto switching between channels. Perform periodic loop checks and inspect module LEDs. Replace with identical Ex unit during maintenance and run a brief signal calibration after swap.
