Description
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Product model | 9460/12-08-11 |
| Manufacturer | R. STAHL |
| Product series | IS1 |
| Module designation | AIM 08 |
| Product type | Analog input module |
| Input channels | 8 for 2-wire transmitters |
| Alternative configuration | 4 channels for 3-/4-wire transmitters and current sources |
| Input signal | 0–20 mA / 4–20 mA |
| Maximum output voltage Uo | 26.2 V |
| Maximum output current Io | 86 mA |
| Maximum output power Po | 561 mW |
| Maximum ambient temperature | +65°C |
| Minimum ambient temperature | -20°C |
| Weight | Approximately 0.321 kg |
| Explosion protection | Ex ib [ia] IIC/IIB T4 |
| Installation | IS1 BusRail |
| Terminal arrangement | Separate terminal unit required |
The intrinsic-safety parameters and ordering information are documented in R. STAHL’s official Series 9460 technical literature.
Product Introduction
The R. STAHL 9460/12-08-11 is designed to acquire analog current signals from field transmitters installed in hazardous industrial environments. It provides intrinsically safe input circuits and transfers the acquired measurements through the IS1 internal data bus to the remote I/O CPU. Typical measurement applications include pressure, flow, level, and process-variable monitoring using compatible current-output transmitters.
The module supports up to eight 2-wire transmitter connections or alternative configurations for 3-wire and 4-wire devices. For 4-wire transmitters, the external power supply must be provided separately. The module’s input and transmitter-supply circuits include short-circuit protection and individual channel monitoring.
946012-08-11
Major Features and Advantages
Eight-channel analog acquisition
The AIM 08 configuration supports up to eight 2-wire transmitter inputs. This allows multiple process measurements to be collected through one remote I/O module.
Intrinsic-safety input design
The Ex i interface is intended to connect compatible field instruments in hazardous locations. The certified electrical entity parameters must be observed when selecting transmitters and calculating field-circuit cable capacitance and inductance.
4–20 mA process signal support
The module handles standard industrial current signals, including 0–20 mA and 4–20 mA. This supports integration with common process transmitters used in chemical, petrochemical, and manufacturing facilities.
Multiple transmitter arrangements
The documented configurations include 2-wire transmitters, selected 3-wire connections, and 4-wire transmitters. The available channel count changes with the wiring arrangement.
Channel-level monitoring
Individual input monitoring helps maintenance personnel identify open-circuit and short-circuit conditions in field wiring.
IS1 system integration
The module installs on the compatible IS1 BusRail and communicates through the remote I/O station architecture. It is not a standalone PLC or independent analog input controller.
Application Scenarios and Field Pitfalls
Typical applications include:
- Pressure transmitter monitoring.
- Flow measurement acquisition.
- Liquid-level monitoring.
- Process instrumentation in hazardous areas.
- Chemical and petrochemical plant control.
- Oil and gas remote instrumentation.
- Distributed process control systems.
Important engineering checks:
- Confirm whether the application uses 2-wire, 3-wire, or 4-wire transmitters.
- Check the actual signal range: 0–20 mA or 4–20 mA.
- Calculate field-circuit capacitance and inductance against the applicable Ex certificate.
- Verify the correct terminal unit and connector arrangement.
- Confirm compatibility with the installed IS1 CPU and BusRail.
- Check channel diagnostics and field wiring before replacing the module.
- Do not apply external transmitter power to intrinsically safe terminals unless the documented wiring arrangement permits it.
Important distinction: The 9460/12-08-11 is not the HART-specific 9461/12-08-11. If the application requires HART communication, verify the correct module designation before ordering.
Related Products and Variants
| Model | Description |
|---|---|
| 9440/15-01-11 | IS1 CPU and power module |
| 9461/12-08-11 | 8-channel HART analog input module |
| 9461/12-08-21 | HART analog input module for 2-wire and 4-wire transmitters |
| 9465/12-08-11 | 8-channel analog output module |
| 9466/12-08-11 | HART analog output module |
| 9480/12-08-11 | Resistance-temperature input module |
| 9481/12-08-11 | Thermocouple and millivolt input module |
These modules perform different signal-processing functions and are not direct substitutes.
Procurement and Quality Control
For replacement procurement, request:
- Complete front and rear module photographs.
- OEM label and revision identification.
- Terminal-unit compatibility confirmation.
- Channel-by-channel input testing.
- Open-circuit and short-circuit diagnostic testing.
- Intrinsic-safety certification documentation.
- Functional communication testing with the installed IS1 CPU.
Procurement recommendation: Specify R. STAHL 9460/12-08-11, AIM 08, 8-channel Ex i analog input module. Confirm the transmitter wiring arrangement and terminal-unit configuration before approving the replacement.
Lifecycle note: A secondary parts listing reports this model as discontinued and identifies 9468/32 as a newer version. Do not assume that 9468/32 is a direct replacement without checking system compatibility and the manufacturer’s migration documentation.
