MKS Loadlock Vacuum Transducer Vac Gauge Vcr 901P-42 1/4

( Brand: Mks ), ( Manufacturer Part Number: 901P42 ), ( Type: Vacuum Pump Transducer ), ( Unit Type: Unit )

Review MKS Tested Loadlock Vacuum Transducer Wide Range Vac Gauge 1/4 Inch Vcr

The **MKS 901P42** is a high-performance, precision-engineered loadlock vacuum transducer designed for demanding applications in semiconductor manufacturing, thin-film deposition, and advanced materials research. Part of MKS Instruments renowned **901P Series**, this **1/4-inch VCR (Vacuum ConfiRmed Reusable) flange** vacuum gauge combines robust construction with exceptional accuracy, making it an indispensable tool for maintaining and monitoring ultra-high vacuum (UHV) and high-vacuum (HV) environments. Engineered to withstand the rigorous demands of industrial and research-grade systems, the 901P42 features a **Pirani gauge sensor**, which provides reliable pressure measurements across a broad range of vacuum levels from rough vacuum (approximately **10 Torr**) to high vacuum (up to **10 Torr**), depending on the specific configuration and calibration. Its **digital output** (via the **901P Controller**) delivers precise, real-time data, enabling operators to optimize chamber performance, prevent contamination, and ensure process consistency.

The **VCR flange connection** ensures a secure, leak-tight seal with minimal outgassing, a critical feature in applications where purity and reliability are paramount. The gauge s **compact yet durable design** integrates seamlessly into loadlock systems, where rapid cycling between atmospheric and vacuum conditions is essential for efficiency. The **901P42 s** robust construction includes a **stainless steel housing** and **ceramic or metal seals**, providing resistance to thermal cycling, chemical exposure, and mechanical stress qualities that extend the gauge s operational lifespan while maintaining calibration stability. Additionally, its **modular compatibility** allows for easy integration with MKS s broader suite of vacuum instrumentation, including mass spectrometers, residual gas analyzers (RGAs), and other process control systems, enhancing its versatility in multi-stage vacuum environments.

Beyond its technical specifications, the **901P42** is engineered with **user-friendly features** that simplify maintenance and diagnostics. Its **self-diagnostic capabilities** alert operators to potential issues such as sensor drift or connection problems, reducing downtime and ensuring continuous operation. The gauge s **calibration flexibility** allows for field adjustments, minimizing the need for recalibration in controlled environments. Whether deployed in **semiconductor wafer processing**, **optical coating**, **metallization**, or **research-grade vacuum chambers**, the MKS 901P42 delivers uncompromising performance, making it a trusted choice for industries where precision and reliability are non-negotiable. With its blend of **high accuracy, durability, and ease of integration**, this vacuum transducer stands as a cornerstone of modern vacuum technology, empowering engineers and scientists to achieve breakthroughs in material science and manufacturing.

### **Pros and Cons of buying a MKS 901P-42 Loadlock Vacuum Transducer (Vacuum Gauge, 1/4" VCR)**

1. **High Precision and Reliability** The MKS 901P-42 is a well-regarded vacuum gauge known for its accuracy in measuring low to medium vacuum pressures (typically 10 -6 to 10 -1 Torr). It is designed for applications requiring precise control, such as thin-film deposition, semiconductor processing, and vacuum chamber monitoring.

2. **Compatibility with Loadlock Systems** Since it is specifically labeled as a "loadlock" gauge, it is optimized for use in loadlock chambers, which are common in vacuum systems for material transfer without breaking the main chamber s vacuum. This makes it ideal for applications like PVD (Physical Vapor Deposition), CVD (Chemical Vapor Deposition), and sputtering.

3. **Durability and Long-Term Performance** MKS Instruments is a reputable manufacturer in the vacuum industry, and their products are generally built to last with minimal maintenance requirements. The 901P series is known for its robustness in harsh environments.

4. **Easy Integration** The 1/4" VCR (Vacuum Confirmed Reusable) connection is a standard interface in vacuum systems, making it straightforward to install without requiring custom fittings. It also ensures a reliable seal, reducing the risk of leaks.

5. **Digital Output Options** Many MKS 901P models include digital interfaces (e.g., RS-232, analog outputs) for integration with control systems, allowing for automated monitoring and process control.

6. **Wide Pressure Range Coverage** While it may not cover ultra-high vacuum (UHV) ranges, its range (typically 10 -6 to 10 -1 Torr) is sufficient for many industrial and research applications where partial pressure or process monitoring is critical.

7. **Calibration Stability** MKS gauges are designed to maintain calibration over extended periods, reducing the need for frequent recalibration, which can be costly and time-consuming.

---

1. **Limited Pressure Range** The 901P-42 is not suitable for ultra-high vacuum (UHV) applications (below 10 -8 Torr) or high-pressure environments (above 10 -1 Torr). If your application requires these ranges, you may need additional gauges (e.g., ionization gauges for UHV or Pirani gauges for higher pressures).

2. **Cost** MKS Instruments is a premium brand, and their products can be expensive compared to generic or lower-end vacuum gauges. The price may be a significant investment, especially for small labs or startups.

3. **Maintenance Requirements** While generally durable, vacuum gauges can degrade over time due to exposure to contaminants (e.g., oil backstreaming, reactive gases). The 901P-42 may require occasional cleaning or replacement of internal components, which can add to long-term costs.

4. **Dependence on Power Supply** Like most electronic gauges, it requires a stable power source. Fluctuations or power outages could disrupt readings or damage the device if not properly protected.

5. **Potential for Signal Drift** Over time, the gauge s sensitivity may drift slightly, requiring periodic calibration to ensure accuracy. This is common in all vacuum gauges but can be an inconvenience in critical applications.

6. **Limited Physical Size** The gauge may not be suitable for very compact or space-constrained systems, though the 1/4" VCR connection helps with integration.

7. **Learning Curve for Setup** Proper installation and calibration may require technical expertise, especially if integrating it into an existing vacuum system. Incorrect installation could lead to inaccurate readings or system leaks.

---

### **Conclusion**

The **MKS 901P-42** is an excellent choice for applications requiring **precise, reliable vacuum measurement in the partial vacuum to low vacuum range (10 -6 to 10 -1 Torr)**, particularly in loadlock systems. Its **durability, compatibility with standard interfaces, and integration capabilities** make it a strong option for industries like semiconductor manufacturing, thin-film deposition, and materials research.

However, if your application demands **ultra-high vacuum (UHV) or high-pressure monitoring**, you will need to pair it with additional gauges. The **higher cost and maintenance considerations** may also be drawbacks depending on your budget and technical resources.

### **Recommendation**

- You need a **reliable, high-precision gauge** for **partial to low vacuum ranges** in a loadlock system.

- Your budget allows for a **premium, long-term solution** with minimal maintenance.

- You require **digital output compatibility** for automated control systems.

- You are working in **semiconductor processing, thin-film deposition, or similar applications** where accuracy is critical.

- You require **ultra-high vacuum (UHV) measurement** (in which case an ionization gauge or Bayard-Alpert gauge may be needed).

- Your budget is tight, and you can find a **lower-cost, equally reliable gauge** (e.g., some competitive brands offer similar performance at a reduced price).

- Your system has **extreme environmental conditions** (e.g., high temperatures, corrosive gases), which might require a more specialized gauge.

For most **industrial and research-grade vacuum applications within its specified range**, the **MKS 901P-42 is a solid, well-supported choice**. Always verify compatibility with your specific system and consult with MKS or a vacuum specialist to ensure optimal performance.

Details:

Wide-range loadlock gauge: 1 10 5 to 1000 Tore Used. TESTED MKS 901P42 Loadlock Vacuum Transducer for Pressure Measurements. See Attached Photos.

part #: 901p42 prices

• $149.90-$229.00

specifications valvplu:

• brand: Mks
• mpn: 901p42
• type: Vacuum Pump Transducer
• unit type: Unit

shipping valvplu:

• type: Fixed
• service: Standard
• cost: $0.00
• class: Standard
• transit: 2-5 Days

offer valvplu:

• best offers: True
• started: April 2, 2026
• sold: 0
• options: Ship-to-home
• availability: In Stock
• quantity: 1

seller valvplu:

• # reviews: 3158
• rating: 99.9%
• city: Fargo, North Dakota

general valvplu:

• Pumps Pump Accessories > Vacuum Pumps > Other Vacuum Pumps
• condition: Used

payments valvplu:

• credit card: Diners-club
• other
• wallet: Google-pay

returns valvplu:

• method: Money back
• policy: Returns Accepted
• time: 30 Days
• paid by: Buyer

Mks 901P42 Is Similar To:

• 100313714 Mks Hps Rev High Vacuum Reducer Adapter To Sst (36.6% similar) I live in two different cities. I try to schedule offers end when am where the item is. Shipping prices quoted are for the contiguous USA. Feel free to ask any questions...(November 10th, 2018)
• 100314603 Mks Instruments High Vacuum Tee Used (31.8% similar) Stainless steel type same size flanges all ports standard modulus. Removed from a working unit and appear to be in great condition ISO KFC tee Mks...(March 26th, 2018)
• 100314805 Mks Instruments Vacuum Cross Series Used Working (33.3% similar) Serial numbers or country of manufacture may vary. Mks instruments ISO-KFC vacuum cross NW40 series 31 used working inventory CONF-579 this is surplus. For lift gate service and pictured test equipment is not included or available sale. Specifications part no: model series 31 flange: NW40 sale ...(April 16th, 2018)
• 100319123 Mks Hps Nw To Vcr Adaptor (19.8% similar) Shipping prices quoted are for the contiguous USA. I try to schedule offers end when am where the item is. I live in two different cities. Feel free to ask any questions...(November 10th, 2018)
• 100760110 Mks Vacuum Flange Blank Ss Centering Ring Seal (28.2% similar) This Mks NW100 vacuum flange blank 304 SS with centering ring seal is new and unused, still sealed under plastic, as shown. Approximate overall unpacked dimensions: 8 l x 7 w all offered products are sold as advertised, is and without warranty. No software, power cords, or other accessories are ...(July 31st, 2018)
• 103250019 Mks Vacuum Control Moducell (26% similar) Mks vacuum control module removed from working equipment at large mfg company undergoing inventory reduction retiring items no longer needed. Do not attempt to fix item yourself...(July 22nd, 2018)
• 122aa-00001bb Mks Instruments Baratron Pressure Transducer Torr Used Working (28.4% similar) The physical condition is good, but there are signs of previous use and handling. Only items pictured are included: if a part is not pictured, or mentioned above, then it included in the sale. Specifications part no: 122AA-00001BB model type 122A range: 100 tore interface: Mks 5-PIN terminal strip ...(July 6th, 2018)
• 122ba-00010ad Mks Baratron Pressure Vacuum (23.4% similar) Shipping information us. This listing is for 1 used Mks baritone pressure vacuum Gage transducer model 122BA-00010AD. Condition: used, working when removed from Lab vacuum system. 10 tore range. Send your questions before purchasing...(January 20th, 2018)
• 124aa-00100bb Mks Instruments Baratron Type Torr Vacuum Pressure Switch (31.8% similar) All parts, including accessories and cables are only included if pictured or listed in the. Compatibility issues are not considered DOA. DOA stands for dead on arrival, meaning that the item did not function properly when it arrived. Do not discard the packaging. Mks instruments baritone 124AA-...(September 11th, 2018)
• 128aa-00002b Mks Baratron Pressure Transducer Type (30.9% similar) All statements regarding products and their configurations are made to the best of our ability with assumption that buyer is knowledgeable proficient in use this type equipment. No manuals,no standard power cords, even if it appears in the photo, accessories, software etc are included unless ...(May 24th, 2018)
• 141a-13957-s Mks Baratron Type Vacuum Switch Model Torr (28.4% similar) Mks baritone type 141 vacuum switch model 141AS 100 tore 24VDC this is in good condition and guaranteed. Item has wear from previous use including minor scuffs and scratches. Photos of actual item for sale. Item is on hand and ready to ship...(April 4th, 2018)