Mks Astron 2l Manual (2026)

The MKS ASTRON 2L (Model AX7657-85) is a high-performance Remote Plasma Source (RPS) designed for reactive gas generation in semiconductor manufacturing. This specialized equipment is primarily used for NF3 dissociation to clean process chambers. Core Technical Specifications

According to technical data from CAE Online and MKS Instruments, the unit features:

Output Power: Adjustable output current ranging from 5A to 20A.

Cooling Requirements: Requires water cooling with a minimum flow of 2.0 gpm during operation and 0.5 gpm during idle.

Process Compatibility: Specifically designed for 100% NF3 process gas feed using ISO KF40 inlet/outlet connections.

Safety Features: Built-in protections for overvoltage, overcurrent, and overtemperature. Operational Guidelines

While specific "Quick Start" manuals for the 2L variant are often restricted to MKS Technical Support, standard operation for the ASTRON series involves:

Gas Supply: Typically requires 100% Argon (Ar) for plasma ignition. After ignition is stabilized (1 to 4 Torr), the process gas (NF3) is introduced and the Argon can be removed. mks astron 2l manual

Control Interface: Features 9 and 25 pin D-connectors with opto-isolated I/O for remote monitoring and alarm output.

Maintenance: MKS recommends against unauthorized modifications. Critical components like plasma blocks and electronic circuit boards (Power, Control, Ignition) should be serviced via the MKS Refurbishment Program. Purchasing and Availability

As of April 2026, the ASTRON 2L is available through specialized semiconductor equipment retailers:

Semiconductor Spares: Offers new surplus units for approximately $15,507.25 and tested working units for $12,010.25.

eBay - usedeqsales: Lists used units with prices ranging from $10,012 to $15,507.

You're looking for features of the MKS Astron 2L manual. The MKS Astron 2L is a popular manual controller designed for controlling stepper motors and other devices. Here are some of its key features:

Overview

The MKS Astron 2L is a manual pulse generator (MPG) designed to provide precise manual control over stepper motors. It's commonly used in CNC machines, 3D printers, and other motion control applications.

Key Features:

  1. 2-Axis Control: The Astron 2L allows for simultaneous control of two axes, making it ideal for applications that require movement in two dimensions.
  2. Manual Pulse Generation: The device generates pulses that are sent to the motor controller, allowing for precise manual control over the motor's movement.
  3. Quadrature Output: The Astron 2L produces quadrature output signals, which are compatible with most stepper motor controllers.
  4. Adjustable Pulse Rate: The device allows for adjustable pulse rates, enabling users to customize the speed of the motor movement.
  5. Two Independent Axes: Each axis has its own independent control, allowing for simultaneous movement in two axes.
  6. Durable Construction: The Astron 2L features a durable aluminum enclosure and high-quality components, ensuring reliable operation in demanding environments.
  7. Compact Size: The device is compact and lightweight, making it easy to integrate into existing systems.

Technical Specifications:

  • Input voltage: 5V
  • Output signals: Quadrature (A, B, and Index)
  • Pulse rate: Adjustable up to 100 kHz
  • Axes: 2 independent axes
  • Dimensions: 120mm x 60mm x 30mm (L x W x H)

Applications:

  • CNC machines
  • 3D printers
  • Motion control systems
  • Robotics
  • Automation systems

2.2 Analog Output Wiring

The analog output is on the 15-pin D-sub connector (J5).

  • Pin 2: Analog Out (0-10 VDC, log)
  • Pin 1: Analog Common

The manual specifies: Pressure (Torr) = 10^(Vout - 8). For example, 6 V output = 10⁻² Torr; 4 V output = 10⁻⁴ Torr.

Error 1: Bar graph is fully lit or zero segments lit

  • Probable cause: Gauge tube failure or disconnected cable.
  • Manual fix: Check continuity of gauge cable. Inspect the gauge tube’s magnet and internal electrode for contamination.

Part 9: Frequently Asked Questions (FAQ)

Q: Can I use a different brand of gauge tube with the Astron 2L?
A: The manual explicitly states: Use only MKS Series 422 or 423. Filament characteristics (thoria-coated iridium) and grid geometry are matched to the emission current regulation circuit. The MKS ASTRON 2L (Model AX7657-85) is a

Q: The manual says “Degas” but I have no button.
A: Some early Astron 2L models require an external degas trigger. Consult your specific revision’s manual to add a momentary switch to the rear remote port.

Q: My analog meter is stuck. Can I replace it with a digital display?
A: Technically, yes. The 0-10 V output on the rear panel can drive a digital panel meter. However, the front meter’s logarithmic response is non-linear; a digital voltmeter reading requires the formula above.

Q: Is there a difference between “Astron 2L” and “Astron 2L-D”?
A: Yes. The “D” variant includes dual setpoints and a 0-1 mA recorder output. The standard manual covers the base unit. Always verify the suffix.

Recommended Schedule:

  • Monthly: Inspect and clean the 9-pin gauge connector.
  • Annually: Check internal power supply ripple (should be <50 mV p-p at 12V rail). Replace the electrolytic capacitors in units older than 10 years.
  • As needed: Replace the gauge tube after 500–1000 hours of operation in dirty vacuum systems.

Part 1: Understanding the MKS Astron 2L

Before diving into the manual specifics, it is crucial to understand what the Astron 2L is—and what it is not.

  • Type: Single-channel hot cathode ionization gauge controller.
  • Compatible Gauges: Typically used with MKS Series 422 or 423 Bayard-Alpert style gauges.
  • Display: Analog meter with logarithmic scaling.
  • Outputs: 0-10 VDC analog output for pressure recording, plus setpoint relays.
  • Key Feature: It uses a stable emission current (0.1 mA or 4 mA selectable) to ionize gas molecules, allowing for accurate high and ultra-high vacuum (UHV) measurement.

The manual for this device is critical because the Astron 2L operates with high voltages (up to 180V for the ion collector and 500V for the filament bias). Mishandling can lead to electric shock or destruction of the fragile gauge filament.

2. Understanding the Control Interface

The MKS Astron 2L features a straightforward user interface, typically consisting of a knob or buttons and a small display screen.

  • Time Adjustment: The primary function is setting the cure time. You can typically adjust this from 0 to 999 seconds (or minutes, depending on the firmware version).
  • Start/Stop: A long press usually starts the cycle, while a short press or a separate button stops it.
  • Safety Sensor: The machine should have an automatic shut-off feature. If you lift the lid during operation, the UV LEDs should cut power immediately to protect your eyes. Always test this before your first cure.