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ABB 3BDH000741R1 CTI 21-P Ex
The ABB 3BDH000741R1 CTI 21-P Ex is an intrinsically safe temperature input module for the ABB Symphony Plus automation platform. It is designed for temperature and related analog signal acquisition in industrial process applications where hazardous-area requirements apply. ABB identifies it as “CTI 21-P Ex, Temperature Input” and specifies ATEX-certified intrinsic-safety protection.
Product Parameters
| Parameter |
Specification |
| Manufacturer |
ABB |
| Product ID |
3BDH000741R1 |
| ABB Type Designation |
CTI 21-P Ex |
| Product Type |
Temperature Input Module |
| Input Capacity |
Up to 32 temperature input channels |
| Supply Voltage |
20–33 VDC |
| Current Consumption |
250 mA at 24 VDC |
| Power Dissipation |
Approx. 6 W |
| Signal Ranges |
-10…+20 mV, -10…+80 mV, -10…+460 mV, 0…1 V, 0…5 V |
| Sensor Types |
Thermocouples and resistance thermometers |
| Sensor Supply |
1.0 mA ±1.7% constant current |
| Line-Break Threshold |
2.5 kΩ ±10% |
| Isolation |
Central galvanic isolation; functional isolation by channel |
| Ex Protection |
II (2) G [Ex ib IIC Gb] |
| ATEX Certificate |
PTB 03 ATEX 2143 X |
| Operating Ambient |
0…50°C |
| Dimensions |
40.64 × 311.15 × 160 mm |
The above electrical and mechanical specifications are from ABB's Symphony Plus product catalog.
Core Function
The CTI 21-P Ex acquires temperature signals from field sensors and makes them available to the Symphony Plus control system. Its inputs can be configured for different thermocouple and resistance-temperature measurement applications, while compensation for line resistance can be implemented.
The product documentation also identifies support for thermocouples, Pt/Ni 100, mV/V signals and resistance measurements, with channel isolation and ATEX certification.
Design Features
- 32 independently configurable temperature inputs for high-density temperature acquisition.
- Intrinsic-safety design with II (2) G [Ex ib IIC Gb] protection.
- Channel-wise functional isolation helps reduce interaction between individual measurement circuits.
- Supports multiple thermocouple and resistance-temperature sensor configurations.
- Built-in sensor/transmitter supply simplifies field-loop implementation.
- Designed for integration into the ABB Symphony Plus MR Series I/O architecture.
Hardware Composition
The main hardware functions include the temperature-input circuitry, signal conditioning and isolation circuitry, sensor excitation/supply circuitry, and the module interface to the Symphony Plus rack.
For the documented installation, ABB specifies CI 120/121 Ex cable clamps as necessary accessories.
Application Scenarios
The 3BDH000741R1 CTI 21-P Ex is suitable for process automation systems requiring temperature acquisition, particularly where intrinsically safe instrumentation is required. Typical applications include:
- Oil and gas processing
- Petrochemical plants
- Chemical processing
- Power generation
- Refining systems
- Process temperature monitoring
- Hazardous-area instrumentation
Maintenance Considerations
When maintaining a CTI 21-P Ex installation, verify the correct module type, Ex certification, field wiring and compatible accessories before replacement. Sensor calibration and loop checks should also be performed according to the plant's maintenance procedures.
Because this is an intrinsically safe Ex module, installation and servicing should follow the applicable ABB documentation and site hazardous-area procedures rather than treating it as a conventional analog input card.
Overall Evaluation
The ABB 3BDH000741R1 CTI 21-P Ex is a high-density temperature acquisition module within the Symphony Plus ecosystem, combining multi-channel temperature measurement, configurable signal ranges, channel-level functional isolation and ATEX-certified intrinsic safety. Its 32-channel capacity makes it particularly suitable for process systems with a large number of temperature measurement points.
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