Description
🔹 Product Introduction
The ABB CTI 21-P Ex, model 3BDH000741R1, is a temperature input module for ABB Symphony Plus and compatible AC 870P local I/O systems. It supports temperature measurement using thermocouples, Pt100/Ni100 resistance thermometers, and configurable millivolt, voltage, and resistance signals. The module provides up to 32 temperature input channels, with channel configurations depending on the sensor wiring mode.
Designed for industrial process monitoring, the CTI 21-P Ex features galvanic isolation and intrinsic-safety protection for supported field circuits. Its applications include temperature monitoring in power generation, chemical processing, and other industrial facilities. The module requires compatible system hardware and accessories, including the specified CI 120/CI 121 Ex connection components and cable clamp. Verify the installation requirements and hazardous-area certification before commissioning.
📋 Product Datasheet
| Parameter | Specification |
|---|---|
| Brand | ABB |
| Model | CTI 21-P Ex |
| Part Number | 3BDH000741R1 |
| Series | Symphony Plus / AC 870P Local I/O |
| Product Name | Temperature Input Module |
| Place of Manufacture | Not confirmed |
| Product Status | Availability and condition to be confirmed |
| Dimensions | 40.64 × 311.15 × 160 mm (W × H × D) |
| Weight | Not confirmed; verify the actual unit |
| Country of Origin | To be confirmed from the product label |
| Power Requirements | 20–33 V DC |
| Current Consumption | 250 mA at 24 V DC |
| Power Dissipation | 6 W |
| Input Channels | Up to 32, depending on configuration |
| Sensor Types | Thermocouples, Pt100/Ni100, voltage and resistance |
| Intrinsic Safety | II (2) G [Ex ib IIC Gb] |
| Ambient Temperature | 0°C to 50°C at the rack ventilation temperature |
| Discontinued | Current lifecycle status not confirmed |
⭐ Recommended ABB Models
- CAI 10-P — Analog input module supporting 16 current inputs with HART.
- CAI 20-P — Analog input module supporting 32 current or voltage inputs.
- CAI 10-2-P Ex — Intrinsically safe analog input module for compatible systems.
- CTI 21-P — Temperature input module without the Ex designation; verify system requirements.
- CAC 10-P — Control module for closed-loop process control applications.
- CI 120 Ex — Connection accessory specified for compatible CTI 21-P Ex installations.
- CI 121 Ex — Alternative connection accessory specified for compatible installations.
- PM866 — AC 800M controller for process automation.
- PM891 — High-performance AC 800M controller.
- AI810 — Analog input module for compatible ABB automation systems.
- AI835 — Analog input module for process instrumentation.
- AO810 — Analog output module for control signals.
- DI810 — Digital input module for discrete field signals.
- DO810 — Digital output module for industrial control.
- CI854A — PROFIBUS-DP communication interface for compatible AC 800M systems.
The recommended modules and accessories belong to ABB’s broader automation portfolio. They are not all direct substitutes for the CTI 21-P Ex; confirm the I/O platform, signal type, wiring configuration, and hazardous-area requirements before ordering.
