VARIAN HS-32 Agilent Diffusion Pump 76143-309

( Brand: Varian ), ( Manufacturer Part Number: HS-32 ), ( Part Type: Pump ), ( Inlet Flange Diameter: 32 In ), ( Foreline Port Diameter: 6 In ), ( Supply Voltage: 480v/3ph ), ( Country Of Origin: United States )

Review VARIAN Agilent Diffusion Pump Large

The **Agilent Technologies Varian HS-32 Diffusion Pump (Part Number 76143-309)** is a high-performance, oil-sealed diffusion pump designed for demanding applications in vacuum systems, particularly within research laboratories, semiconductor manufacturing, and analytical instrumentation. Engineered with precision and durability in mind, this pump leverages advanced diffusion technology to achieve exceptional pumping speeds and ultra-low ultimate pressures, making it an indispensable component for processes requiring stringent environmental control. The HS-32 features a robust **32-liter per second nominal pumping speed** at nitrogen, ensuring efficient evacuation of gases while maintaining high throughput for critical applications such as mass spectrometry, surface science, and thin-film deposition. Its **high-vacuum (HV) diffusion design** utilizes a specialized oil blend that minimizes backstreaming and maximizes efficiency, even under heavy load conditions, while its **all-metal construction** enhances reliability and longevity in harsh operational environments.

The pump s **modular and compact design** allows for seamless integration into existing vacuum systems, with a standard **CF 100 (ISO-KF 100) flange connection** for easy installation. Its **built-in baffle system** effectively reduces oil vapor backdiffusion, protecting sensitive instrumentation and maintaining clean vacuum environments. The HS-32 is equipped with a **thermostatically controlled heater** and **temperature control system**, ensuring optimal operating conditions for consistent performance across a wide range of pressures. Additionally, its **durable stainless steel housing** and **ceramic diffusion elements** contribute to corrosion resistance and thermal stability, making it suitable for both laboratory and industrial applications where reliability is paramount.

For users seeking versatility, the Varian HS-32 is compatible with a variety of Agilent and third-party vacuum controllers, allowing for precise monitoring and automation of pumping operations. Its **low maintenance requirements** and **extended oil life** further reduce operational downtime, making it a cost-effective solution for long-term use. Whether deployed in a high-precision analytical lab or a semiconductor fabrication facility, this diffusion pump delivers uncompromising performance, ensuring that vacuum systems operate at peak efficiency while maintaining the integrity of sensitive experiments and processes. With its blend of engineering excellence and adaptability, the Agilent Varian HS-32 stands as a cornerstone for achieving and sustaining the ultra-high vacuum conditions essential for modern scientific and industrial advancements.

**Pros and Cons of buying a Varian HS-32 (Agilent Diffusion Pump, Part Number 76143-309)**

### **Pros**

1. **High Performance and Efficiency** The HS-32 is a robust diffusion pump designed for high-vacuum applications, capable of achieving excellent ultimate pressures (typically in the low 10 -7 Torr range) when paired with a compatible fore pump. Its large aperture (32 mm) allows for high throughput, making it suitable for applications requiring rapid pumping speeds, such as mass spectrometry, thin-film deposition, or surface science research.

2. **Compatibility with Agilent Systems** As part of Agilent s (now Keysight) product line, this pump is designed to integrate seamlessly with Agilent s mass spectrometers and other analytical instruments. This ensures better compatibility with existing setups, reducing the need for extensive modifications or additional adapters.

3. **Durability and Longevity** Varian (Agilent) pumps are known for their sturdy construction, often featuring high-quality materials like stainless steel and copper for the diffusion section. With proper maintenance, these pumps can last for decades, especially in research or industrial environments where they are used intermittently.

4. **Proven Reliability in Research** The HS-32 has a long history of use in academic and industrial research labs, particularly in fields like analytical chemistry, materials science, and semiconductor manufacturing. Its reputation for reliability makes it a trusted choice for users who prioritize performance over cost.

5. **Ease of Maintenance** Compared to some other high-vacuum pumps, diffusion pumps like the HS-32 are relatively straightforward to service. Routine tasks such as oil changes (if using diffusion oil) and occasional bake-outs are manageable with basic vacuum training. Agilent also provides service manuals and support, which can be helpful for troubleshooting.

- Thin-film deposition (e.g., sputtering, evaporation).

- Surface analysis (e.g., XPS, AES).

- Gas chromatography (GC) systems requiring high-vacuum conditions.

- Plasma etching or deposition in microfabrication.

7. **Second-Hand Availability and Cost Savings** Since this is an older model (discontinued but still widely available used), purchasing it second-hand can be significantly cheaper than buying a new diffusion pump. This makes it an attractive option for labs on a budget or those with existing infrastructure that requires a specific pump size.

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### **Cons**

- **Limited spare parts availability** Over time, finding replacement parts (e.g., diffusion oil, gaskets, or internal components) may become difficult or expensive.

- **No software or firmware updates** Unlike newer pumps, this model lacks modern control interfaces or digital monitoring features.

- **Compatibility issues with newer systems** While it may work with older Agilent instruments, integrating it with modern or non-Agilent equipment could require additional adapters or modifications.

- **Regular oil changes** (if using diffusion oil), which can be messy and time-consuming.

- **Bake-outs** to remove contaminants from the oil, which may not be feasible in all lab setups.

- **Potential for oil vapor backstreaming** into the vacuum chamber, which can contaminate samples or instruments if not properly managed (though this is mitigated with proper cold traps).

3. **Energy Consumption** Diffusion pumps are inherently less energy-efficient than modern alternatives like turbomolecular pumps. They require significant power to heat the diffusion section and maintain operating temperatures, leading to higher electricity costs over time.

- **Flammability** Some oils are flammable, requiring careful handling and proper ventilation.

- **Toxicity** Prolonged exposure to oil vapors can be harmful, necessitating good lab practices and ventilation.

- **Environmental impact** Disposal of used diffusion oil must comply with hazardous waste regulations.

5. **Slower Pumping Speed Compared to Modern Alternatives** While the HS-32 is efficient for its size, newer turbomolecular or cryogenic pumps often offer faster pumping speeds and lower ultimate pressures with less maintenance. For applications requiring ultra-high vacuum (UHV), a diffusion pump may not be the best choice.

6. **Limited Warranty or Support** Since the pump is discontinued, any remaining warranty (if applicable) is likely expired. Troubleshooting or repairs may require third-party vendors, which could be costly or slow.

- Adequate clearance for heat dissipation (they operate at high temperatures).

- Proper mounting and alignment to ensure optimal performance.

- A compatible fore pump (e.g., rotary vane pump) to achieve the desired ultimate pressure.

---

### **Recommendation**

- Already use Agilent instruments and need a specific 32 mm diffusion pump.

- Operate in applications where high throughput and moderate vacuum levels (low 10 -7 Torr) are sufficient.

- Can handle the maintenance requirements (oil changes, bake-outs) and safety considerations.

- Are purchasing it second-hand to save costs, with the understanding that long-term spare parts may be harder to obtain.

However, if you are **starting a new project, working in ultra-high vacuum (UHV) applications, or prioritizing modern features like digital control and energy efficiency**, a **turbomolecular pump (e.g., from Pfeiffer, Edwards, or Leybold)** or a **cryogenic pump** may be a better long-term investment despite higher upfront costs.

- You have an existing Agilent system and need a compatible diffusion pump.

- You are on a tight budget and can source a well-maintained used unit.

- Your application does not require UHV and can tolerate the maintenance demands.

- You have access to diffusion oil and can properly manage safety and disposal.

- You need **ultra-high vacuum (UHV) or faster pumping speeds** consider a turbomolecular pump instead.

- Your lab lacks experience with diffusion pumps or proper maintenance infrastructure.

- You anticipate long-term use without access to spare parts or support.

- You are working with **sensitive samples** that could be contaminated by oil backstreaming.

For most **modern research or industrial applications**, a **turbomolecular pump** (e.g., Pfeiffer HiCube or Edwards RV series) is a more versatile and lower-maintenance alternative, despite the higher cost. However, the HS-32 remains a **practical and cost-effective solution** for labs with specific compatibility needs or legacy systems.

Details:

Only shipping within the 48 contiguous states. It is specifically designed for use in the industrial and scientific sectors, providing efficient pumping capabilities maintaining vacuum conditions a variety of applications. Made in the USA, this pump operates on a supply voltage of 480V/3PH. With the trusted Varian brand and reliable performance, this diffusion pump is a valuable addition to any vacuum system.

The Varian / Agilent HS-32 large 76143-309 diffusion pump is a high-quality vacuum designed with 32-inch inlet flange diameter and 6-inch foreline port.

part #: hs32 prices

• $69.99-$19850.00

specifications valvplu:

• brand: Varian
• mpn: Hs-32
• part type: Pump
• inlet flange diameter: 32 In
• foreline port diameter: 6 In
• supply voltage: 480v/3ph
• country of origin: United States

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offer valvplu:

• sold: 0
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• started: June 6, 2026
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• quantity: 1

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• # reviews: 52
• city: Dayton, Nevada

general valvplu:

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

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• time: 30 Days

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