Name: AI950S ABB S900 4-channel Temperature Input Module 3KDE175521L9500
SKU: AI950S
Availability: InStock

Product details

Product overview

ABB AI950S 3KDE175521L9500 is a high‑integrity S900 I/O module for hazardous areas. It accepts signals from Pt100, Pt1000, Ni100 RTDs and thermocouples types B, E, J, K, L, N, R, S, T, U. The unit fits directly in Zone 1 installations and communicates via PROFIBUS DP. Field mounting reduces marshalling cabinets and wiring cost. The housing is rugged, error‑tolerant and designed for live replacement.

Technical specifications – tree structure

Brand: ABB
- Model: AI950S
  - Order suffix: 3KDE175521L9500
    - Type: Analog input module
      - Channels: 4
        Input 1‑4: RTD / TC / mV
        RTD support: Pt100, Pt1000, Ni100, 0‑3kΩ
        Connection: 2‑wire, 3‑wire, 4‑wire
        Thermocouple support: B, E, J, K, L, N, R, S, T, U
        Cold junction: Internal / external
        mV range: ±100 mV
        Isolation: Channel‑to‑channel, input/bus, input/power
        HART: Yes (on each channel)
      - Communication: PROFIBUS DP
        Redundancy ready: Power & bus (module non‑redundant)
      - Diagnostics: Wire break / short / CJC / FDT/DTM
      - Environment: ATEX Zone 1, G3 coating, –20…+60°C

Measurement specifications
- RTD accuracy: ±0.1 % of span typ.
- TC accuracy: ±0.5 °C (with CJC)
- Resolution: 16‑bit
- Linearity error: < 0.02 %
- Frequency response: 10 Hz (integrated noise rejection)
Physical data
- Dimensions (W/D/H): 20 / 104 / 104 mm
- Weight: 0.135 kg
- Material: G3 coated PCB & housing

Installation & mounting – tree view

Area classification: Zone 1 / safe area
- Mechanics: S900 base plate
  - Mounting: DIN rail TS35
  - Field connection: Screw terminals (intrinsically safe)
Wiring: Direct to Zone 0/1/2 sensors
- Cable type: Shielded recommended for TC/mV

Maintenance & diagnostics – tree

Live maintenance: Hot swap & hot config
- Module exchange: No primary power cut
- Parameter update: In‑run via PROFIBUS
Self‑diagnostics:
- Per channel: Open / short detection
  - Indication: LED & bus status
- CJC supervision: Internal sensor watch
- FDT/DTM: Full waveform & history

Compatibility & system integration – tree

System: ABB S900 I/O
- Network: PROFIBUS DP (any master)
- Coupler required: e.g. 3KDE175511L9300 (Zone 1)
Device support:
- HART: Yes, transparent
- Intrinsic safety: Ex ia for all channels

Certifications – tree

Hazardous area: ATEX II 2(1) G Ex ia [ia Ga] IIC T4 Gb
- Zone: 1 (module), 0/1/2 (sensors)
Industrial: CE, RoHS, WEEE
- Corrosion: ISA‑S71.04 G3
- Climate: 93 % RH @ 40 °C, –20…+60 °C

Package & warranty – tree

Included: AI950S module + quick guide
- Optional: Manual download
Warranty: 12 months
- Shipping: FedEx, UPS, DHL (tracked)

Typical applications – tree

Oil & gas: Zone 1 temperature monitoring
- Example: Wellhead RTDs
Chemical: Reactor TC arrays
- Example: Type K on cracking towers
Pharma: Sterilizers with Pt100
- Example: 3‑wire Pt100 in autoclaves
Field replacement: Remote I/O cabinets removal

Diagnostic capabilities – tree

Hardware: Per‑channel fault LEDs
- Wire break / short: Individual flags
Software: FDT/DTM detailed logs
- History: Min/max, trends
- CJC status: Internal sensor readback

FAQ – experience based selection

Can I use AI950S with a redundant coupler?
Yes. The module works with redundant PROFIBUS DP couplers; the S900 system supports redundancy at power and bus level.
What is the difference between AI950S and AI950?
AI950S includes ATEX Zone 1 certification and intrinsic safety per channel. AI950 is for safe area only.
Do I need external safety barriers?
No. Each channel is galvanically isolated and Ex ia rated. You connect field devices directly.
How to select between internal and external CJC?
Use internal for short cable runs; use external terminal CJC for long distances or high accuracy.
Which RTD connection gives best accuracy?
4‑wire eliminates lead resistance. 3‑wire is good for most industrial needs. 2‑wire is acceptable for short, thick wires.
Can this module read potentiometers?
Yes, in 0‑3 kΩ mode you can connect 2‑ or 3‑wire potentiometers.
Is G3 coating standard?
Yes, all AI950S modules ship with ISA‑S71.04 G3 conformal coating.
What is the typical lead time?
Stock items ship within 24h via FedEx/UPS/DHL. Please inquire for bulk.
Which field housings fit S900 mechanics?
Standard S900 terminal bases (order separately if needed).