ALSTOM AS111-2 Analog Signal Isolation & Conditioning Module
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ALSTOM AS111-2 Analog Signal Isolation & Conditioning Module
The ALSTOM AS111-2 functions as a high-performance signal isolation and conditioning module, serving as a protective barrier between field devices (sensors, actuators) and the central control system. It accepts analog input signals—typically 4–20mA or 0–10V—from field sensors, isolates them from the output side using transformer-based isolation (providing up to 2.5kVrms isolation), and conditions the signal to remove noise and linearize non-ideal sensor outputs. This conditioned signal is then transmitted to PLCs, DCSs, or data loggers, ensuring that the control system receives accurate, reliable data.
Model Number AS111-2
Brand ALSTOM
Type Analog Signal Isolation & Conditioning Module
Input Voltage 24 VDC ±10% (loop-powered option available)
Operating Temp Range -40°C to +70°C (suitable for extreme industrial environments)
Mounting Style DIN rail (35mm) with DIN EN 50022 compliance
Dimensions 22.5mm x 105mm x 118mm (W x H x D) (compact design for dense panel installations)
Weight 120g
Interface/Bus Field wiring terminals (input/output); no backplane required
Compliance IEC 61010-1 (safety), IEC 61326-1 (EMC), UL 508
Supported Protocols N/A (analog signal processing; compatible with all standard analog control systems)
Typical Power Draw 0.8W (loop-powered mode); 1.2W (externally powered)
The ALSTOM AS111-2 functions as a high-performance signal isolation and conditioning module, serving as a protective barrier between field devices (sensors, actuators) and the central control system. It accepts analog input signals—typically 4–20mA or 0–10V—from field sensors, isolates them from the output side using transformer-based isolation (providing up to 2.5kVrms isolation), and conditions the signal to remove noise and linearize non-ideal sensor outputs. This conditioned signal is then transmitted to PLCs, DCSs, or data loggers, ensuring that the control system receives accurate, reliable data.
AS111-2
What sets the ALSTOM AS111-2 apart is its dynamic signal filtering capabilities. Unlike fixed-filter modules that may over-dampen fast-changing signals, this module uses adaptive filtering: it automatically adjusts cutoff frequencies based on signal variability, preserving the integrity of rapid transients (like pressure spikes in hydraulic systems) while suppressing steady-state noise. It also features a wide input range, accommodating both active (powered) and passive sensors without the need for external resistors, simplifying integration into mixed-sensor environments.
AS111-2
Technical specifications:
Model Number AS111-2
Brand ALSTOM
Type Analog Signal Isolation & Conditioning Module
Input Voltage 24 VDC ±10% (loop-powered option available)
Operating Temp Range -40°C to +70°C (suitable for extreme industrial environments)
Mounting Style DIN rail (35mm) with DIN EN 50022 compliance
Dimensions 22.5mm x 105mm x 118mm (W x H x D) (compact design for dense panel installations)
Weight 120g
Interface/Bus Field wiring terminals (input/output); no backplane required
Compliance IEC 61010-1 (safety), IEC 61326-1 (EMC), UL 508
Supported Protocols N/A (analog signal processing; compatible with all standard analog control systems)
Typical Power Draw 0.8W (loop-powered mode); 1.2W (externally powered)
Contact Us Phone:+86 16626708626 WeChat/WhatsApp:+86 16626708626 Email: 3772179818@qq.com
AS111-2
Main features and advantages:
Choosing the ALSTOM AS111-2 delivers tangible operational benefits, starting with enhanced system reliability. By isolating field signals from control electronics, it reduces the risk of control system damage from voltage surges—common in industrial environments due to lightning strikes or motor startup transients. This protection extends the lifespan of expensive PLC modules and reduces maintenance costs associated with component replacement.
In terms of performance, the module’s low drift (less than 0.01% of full scale per °C) ensures consistent accuracy across temperature extremes, eliminating the need for frequent recalibration. This is particularly valuable in outdoor installations, like pipeline monitoring stations, where temperature fluctuations can cause uncompensated drift in lesser modules. For engineers, the ALSTOMAS111-2 simplifies system design: its universal input range and adaptive filtering reduce the need to stock multiple module types for different sensors, cutting inventory costs and engineering time spent on component selection.
Perhaps most critically, the module’s reliable signal conditioning directly improves process control. In a water treatment plant, for example, accurate flow rate signals (conditioned by the ALSTOMAS111-2) ensure precise chemical dosing, reducing chemical waste and ensuring regulatory compliance. In manufacturing, consistent pressure signals lead to tighter quality control—such as maintaining uniform thickness in plastic extrusion processes.
Application areas:
The ALSTOM AS111-2 is deployed across industries where signal integrity is mission-critical. In power generation—specifically in turbine control systems—it isolates vibration and temperature sensor signals from the turbine’s high-voltage environment, ensuring that the control system receives accurate data to prevent catastrophic turbine failure. In chemical processing, it protects DCS inputs from corrosive environment-induced ground loops in pH and conductivity sensors, maintaining precise control over reaction parameters.
In transportation infrastructure, such as railway signaling systems, the module isolates track circuit signals from control room electronics, preventing noise from passing trains from disrupting signal logic. Its wide temperature range also makes it suitable for offshore oil platforms, where salt spray and extreme temperature swings would degrade the performance of non-industrial-grade isolators. In each application, the ALSTOM AS111-2ensures that critical signals remain actionable, even in the harshest operating conditions.
Related products:
AS111-1 – Single-channel version for applications requiring isolation of individual signals.
AS112-2 – Dual-channel module with redundant power inputs for safety-critical systems (SIL 2 capable).
AS131-2 – High-voltage analog isolator (up to 100V input) for battery monitoring systems.
AS211-2 – Digital signal isolator, complementary to the AS111-2 for mixed analog/digital systems.
AS111-2-PRO – Enhanced version with built-in diagnostics (signal strength LED indicators).
PS-AL-24 – 24VDC power supply module, tested for compatibility with AS111-2 in dense panel setups.
Installation and maintenance:
Installing the ALSTOM AS111-2 requires attention to wiring practices to maximize isolation effectiveness. Ensure that input and output wiring are routed through separate cable trays or conduit to prevent capacitive coupling—this preserves the module’s isolation rating. For loop-powered sensors (4–20mA), verify that the module’s loop resistance (maximum 350Ω) is compatible with the sensor’s drive capability. Check that the mounting rail is properly grounded to provide a common reference, reducing electrostatic discharge risk.
Ongoing maintenance is minimal but critical: inspect terminal blocks quarterly for corrosion (especially in humid or corrosive environments) and tighten any loose connections to prevent signal degradation. The module’s LED status indicator (green for normal operation, red for power loss) provides at-a-glance health checks during routine panel inspections. Recalibration is recommended every 2 years, though the module’s low drift means many users extend this interval to 3–5 years in non-critical applications.
WhatsApp: +86 16626708626
Email: 3772179818@qq.com
Phone: +86 16626708626
