ABB AI950S Analog Input Module for Zone 1 Hazardous Areas
The ABB AI950S analog input module delivers safe and accurate temperature measurement in explosive environments. This S900 series unit installs directly in Zone 1 hazardous areas. It connects intrinsically safe field devices located in Zone 0, Zone 1, or Zone 2. Many engineers choose this AI950S because it eliminates costly explosion-proof enclosures. Additionally, the module supports both RTD and thermocouple sensors.
Key Technical Specifications of AI950S
This ABB AI950S includes four isolated input channels. Each channel supports Pt100, Pt1000, and Ni100 in 2-, 3-, or 4-wire technology. For thermocouples, it handles types B, E, J, K, L, N, R, S, T, U, and raw mV signals. The module provides both internal and external cold junction compensation.
Furthermore, it features short circuit and wire break detection. Electrical isolation exists between input/bus and input/power. Channel-to-channel isolation prevents signal crosstalk. HART communication passes through the module. Therefore, you can use existing HART instruments without extra hardware.
Mechanical and Environmental Ratings
The AI950S measures only 20 mm wide, 104 mm deep, and 104 mm high. It weighs just 0.135 kg. This compact size saves space in hazardous area cabinets. The module operates between -20°C and +60°C. Relative humidity tolerance reaches 93% at 40°C. Moreover, it carries ATEX Zone 1 certification for direct installation in explosive atmospheres.
All components receive G3 coating per ISA-S71.04. This protects against corrosive environments. The unit also meets CE, RoHS, and WEEE standards. Consequently, it works perfectly in oil refineries, chemical plants, and offshore platforms.
Frequently Asked Questions (FAQ)
1. Can I use the ABB AI950S with existing Pt100 sensors?
Yes. The AI950S supports Pt100, Pt1000, and Ni100 in 2-, 3-, or 4-wire technology. It works with most standard RTD sensors.
2. What is the difference between AI950S, AI950B, and AI950N?
The AI950S is certified for Zone 1 hazardous areas with intrinsic safety. The AI950B is for Zone 2 only. The AI950N is for non-hazardous safe areas only.
3. Does this module support hot swapping in Zone 1?
Absolutely. The ABB AI950S includes hot swap functionality. You can replace it during operation without powering down the system, even in Zone 1.
4. Is the AI950S compatible with PROFIBUS DP networks?
Yes. The S900 system communicates via PROFIBUS DP to the control level. The ABB AI950S works seamlessly within this architecture.
5. How do I check if a channel has a wire break?
The module provides short and break detection for each channel. An LED indicator and diagnostic message will alert you immediately.
