Alcatel ASI20 Detector Control Module

The Alcatel ASI20 is a precision control module designed for vacuum pressure measurement and gauge management. This unit interfaces with various types of vacuum gauges—including ionization gauges (hot and cold cathode), Pirani gauges, and capacitance manometers—providing accurate pressure readout, setpoint control, and data logging. It is widely used in semiconductor processing, thin‑film deposition, research laboratories, and industrial vacuum systems.

Overview

The ASI20 controller is a compact, rack‑mountable unit that offers flexible configuration for different gauge types and measurement ranges. It features a bright digital display for local readout, as well as analog and digital outputs for integration with process controllers and data acquisition systems. The module supports multiple channels (typically 1‑2) and can be expanded via communication bus. Its user‑friendly interface allows for easy calibration and setup of gauge parameters.

Key Features

• Supports cold cathode, hot cathode (Bayard‑Alpert), Pirani, and capacitance manometer gauges

• Measurement range from 10⁻¹¹ to 10³ mbar (depending on gauge)

• High accuracy and stability with temperature compensation

• Local digital display and keypad for configuration

• Analog output (0‑10 V or 4‑20 mA) for pressure signal

• RS‑232 or RS‑485 serial communication

• Setpoint relays for process control (e.g., pump interlock, valve control)

• Compact 19‑inch rack mount (1U or 2U)

Technical Specifications

• Input Channels: 1 or 2 (depending on variant)

• Gauge Compatibility: Ionization (hot/cold cathode), Pirani, capacitive

• Pressure Range: 10⁻¹¹ to 10³ mbar (gauge‑dependent)

• Accuracy: ±10% of reading (typical)

• Analog Output: 0‑10 V or 4‑20 mA, programmable scaling

• Digital Outputs: 2‑4 setpoint relays, 24 VDC/1A

• Communication: RS‑232 (standard), RS‑485 (optional)

• Power Supply: 100‑240 VAC, 50/60 Hz, or 24 VDC optional

• Power Consumption: 20 W typical

• Operating Temperature: +5°C to +40°C

• Dimensions: 44 mm (H) × 483 mm (W) × 250 mm (D) – 1U

Applications

The ASI20 is used in vacuum coating systems, plasma etching tools, mass spectrometers, and vacuum furnaces. It provides the critical pressure measurement needed for process control and equipment protection.

Integration and Management

The module can be integrated into higher‑level control systems via analog signals or serial communication. It supports standard protocols (e.g., Modbus) for easy integration with PLCs and SCADA systems.

Installation and Maintenance

Mount the unit in a rack, connect the gauge cables, power, and analog/digital I/O. Calibration is performed using the front‑panel keys or via software commands. Routine maintenance includes periodic calibration verification and cleaning of gauge connections.

Conclusion

The Alcatel ASI20 detector control module offers precise, reliable pressure measurement and control for a wide range of vacuum applications, ensuring process quality and equipment safety.