MLS 943-A-120V60-TR-PC 0270-20069 CPA-1 Cold Cathode Pressure Gauge | Replacement, Equivalent & Selection Guide
The MLS 943-A-120V60-TR-PC (Part No. 0270-20069, Series CPA-1) is a cold cathode ionization vacuum gauge designed for high-vacuum measurement in industrial and scientific applications. This page provides full technical specifications, compatible replacement models, and a structured selection guide to help engineers and procurement teams make informed sourcing decisions.
Technical Specifications
- Manufacturer: MLS
- Model / SKU: 943-A-120V60-TR-PC
- Part Number: 0270-20069
- Series: CPA-1
- Type: Cold Cathode Ionization Pressure Gauge (Penning Gauge)
- Supply Voltage: 120 V AC, 60 Hz
- Measurement Range: Typically 1×10⁻² to 1×10⁻⁸ Torr (cold cathode range)
- Output: Transduced / PC-interface compatible (TR-PC suffix)
- Weight: Approx. 800 g
- Enclosure: Industrial-grade housing
- Application Class: High-vacuum process monitoring
Compatible Replacement & Equivalent Models
The following models are commonly evaluated as direct or functional replacements for the MLS 943-A-120V60-TR-PC. Always verify electrical and mechanical compatibility before substitution.
- MKS 943-A Series – OEM equivalent; same CPA-1 cold cathode sensor platform
- Granville-Phillips 342 – Cold cathode gauge, compatible vacuum range
- Pfeiffer PKR 251 – Pirani/cold cathode combination, wider range option
- Edwards AIM-X – Active inverted magnetron, equivalent high-vacuum class
- Leybold PENNINGVAC PTR 90 – Penning gauge, comparable measurement range
- Inficon Penning Gauge – Drop-in compatible for many 943-A installations
Note: Konmask.com stocks original MLS/MKS 943-A series units. Contact us to confirm cross-reference compatibility for your specific system.
Why Choose the Original Model
- Proven Reliability: The 943-A CPA-1 platform has decades of field-proven performance in semiconductor, coating, and research vacuum systems.
- OEM Traceability: Original part number 0270-20069 ensures full traceability for regulated manufacturing environments (ISO, SEMI).
- TR-PC Interface: Built-in transducer and PC-compatible output eliminates the need for additional signal conditioning hardware.
- 120V/60Hz Native: Designed for North American power standards — no transformer required in US/Canada installations.
- Calibration Integrity: Factory-calibrated; aftermarket equivalents may require field recalibration.
Typical Applications
- Semiconductor wafer processing (CVD, PVD, etch chambers)
- Thin-film deposition and sputtering systems
- Electron beam and ion beam equipment
- Research vacuum chambers and mass spectrometers
- Leak detection and vacuum integrity testing
- Industrial freeze-drying and vacuum furnaces
System Compatibility
The MLS 943-A-120V60-TR-PC is compatible with the following controller and system platforms:
- MKS / MLS 937B, 947, 270B vacuum gauge controllers
- Brooks / Granville-Phillips 375 controller
- Systems accepting standard cold cathode gauge head connectors (KF16 / KF25 flange)
- PC-based SCADA and DCS platforms via RS-232 / analog 0–10 V output (TR-PC variant)
Selection Guide
Use the following criteria to confirm the 943-A-120V60-TR-PC is the right choice — or to identify the best alternative:
- Vacuum Range Required: If your process operates between 10⁻³ and 10⁻⁸ Torr, the cold cathode type is appropriate. For pressures above 10⁻³ Torr, consider a Pirani gauge instead.
- Power Supply: Confirm 120 V / 60 Hz availability. For 220–240 V / 50 Hz systems, select the 943-A-220V50 variant.
- Output Interface: The TR-PC suffix provides transduced analog + PC output. If only analog output is needed, the standard 943-A without TR-PC suffix may suffice.
- Flange Size: Verify KF (NW) flange size matches your vacuum port (KF16 or KF25).
- Controller Compatibility: Match gauge head to your existing controller model before ordering.
- Regulatory Requirements: For CE-marked systems, confirm the MLS variant meets applicable directives or select a CE-certified equivalent.
Quality Assurance & Sourcing
- All units sourced by Konmask.com are inspected for physical integrity and part number verification prior to shipment.
- Original manufacturer packaging and documentation preserved where available.
- Traceability documentation (CoC / test reports) available upon request for regulated industries.
- Stock may include new, surplus-new, or refurbished units — condition clearly stated at time of quotation.
- Lead time: In-stock items ship within 3–5 business days; special-order items 2–6 weeks.
How to Order
- Confirm your part number: MLS 943-A-120V60-TR-PC / 0270-20069 / CPA-1
- Specify required quantity and preferred condition (new / surplus / refurbished).
- Request a quotation via support@konmask.com or use the Add to Cart button above.
- Provide your shipping address and any documentation requirements (CoC, test report).
- Payment accepted: T/T (wire transfer), PayPal, and major credit cards.
Replacement & Compatibility FAQ
Q: Is the MLS 943-A the same as the MKS 943-A?
A: MLS and MKS share the same 943-A platform. The part number 0270-20069 is an MKS catalog number. Verify with your system documentation to confirm interchangeability.
Q: Can I use a Pfeiffer PKR 251 as a direct replacement?
A: The PKR 251 is a combination Pirani/cold cathode gauge with a different connector and controller interface. It is a functional equivalent in vacuum range but requires controller and flange adapter changes.
Q: Does the TR-PC variant require special software?
A: The TR-PC output is compatible with standard RS-232 terminals and most vacuum system SCADA software. Consult the MKS/MLS 943-A manual for communication protocol details.
Q: What is the typical service life?
A: Cold cathode gauges typically last 2–5 years depending on process gas exposure and contamination levels. Replacement gauge tubes are available separately.
Q: Can Konmask.com provide a calibration certificate?
A: Yes, calibration certificates can be arranged upon request. Please specify this requirement when placing your order.
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