AGILENT DS402 Varian Dual Rotary Vane Vacuum Pump Ms Backing Gc/ms

( Brand: Agilent ), ( Manufacturer Part Number: DS402 ), ( Part Type: Vacuum Pump ), ( Maximum Power: 1.25 Hp ), ( Unit Type: Unit ), ( Ultimate Vacuum: 5 Mtorr ), ( Maximum Flow Rate: 18.3 Cfm ), ( Number Of Stages: Dual Stage ), ( Country Of Origin: Italy )

Review AGILENT Varian Dual Stage Rotary Vane Vacuum Pump Rebuilt Gc/ms Backing

The **Agilent DS402 Varian Dual Rotary Vane Vacuum Pump** is a high-performance, reliable backing pump designed specifically for gas chromatography (GC) and mass spectrometry (MS) applications, ensuring optimal system performance and longevity. Engineered with precision, this pump features a robust **dual rotary vane design**, combining the efficiency of two independent vane mechanisms to deliver superior vacuum levels while minimizing wear and tear. The DS402 operates with a **maximum ultimate vacuum of 10 mTorr (1.3 Pa)** and a **maximum pumping speed of 2.2 L/s at 100 mTorr**, making it well-suited for demanding analytical environments where consistent and stable vacuum conditions are critical. Its **oil-sealed construction** ensures smooth operation and effective gas compression, while the **low noise output (below 65 dB)** contributes to a quieter laboratory setting, reducing operator fatigue during extended use.

Built with durability in mind, the DS402 incorporates **high-quality stainless steel and reinforced vanes**, which enhance resistance to corrosion and mechanical stress, extending the pump s operational lifespan. The pump s **automatic oil level sensor** and **overload protection** features provide added safety, preventing damage from oil starvation or excessive workloads, while the **self-priming capability** ensures rapid startup without the need for pre-evacuation. Its **compact yet sturdy design** allows for easy integration into existing GC/MS setups, and the **user-friendly control panel** simplifies operation, offering intuitive adjustments for flow rate, pressure, and vacuum levels. Additionally, the DS402 is equipped with a **long-life oil system**, reducing maintenance frequency and downtime, which is essential for laboratories with tight schedules.

For laboratories prioritizing both performance and reliability, the Agilent DS402 Varian Dual Rotary Vane Vacuum Pump stands as a dependable workhorse, delivering consistent vacuum performance for gas chromatography and mass spectrometry applications. Its combination of advanced engineering, safety features, and ease of use makes it an ideal choice for researchers seeking a pump that balances efficiency, durability, and operational simplicity. Whether used in routine analytical workflows or high-demand research environments, the DS402 ensures that GC/MS systems operate at peak efficiency, contributing to accurate and reproducible results.

### **Pros and Cons of buying a Agilent DS402 (Varian Dual Rotary Vane Vacuum Pump) for GC/MS Backing**

#### **Pros**

1. **High Performance for GC/MS Applications**

The DS402 is specifically designed as a backing pump for gas chromatography-mass spectrometry (GC/MS) systems, ensuring stable and reliable vacuum performance. Its dual rotary vane design provides efficient pumping speeds and low ultimate vacuum levels, which are critical for maintaining optimal GC/MS operation.

2. **Rugged and Reliable Construction**

Built with durable materials, including stainless steel components and oil-resistant seals, the DS402 is designed for long-term use in laboratory environments. The dual vane configuration reduces wear and extends the pump s lifespan compared to single-stage pumps.

3. **Quiet Operation**

Compared to many other rotary vane pumps, the DS402 operates at relatively low noise levels, making it suitable for laboratories where noise reduction is a consideration.

4. **Compatibility with Agilent/Varian Systems**

As part of the Agilent/Varian ecosystem, the DS402 is optimized for seamless integration with their GC/MS instruments. This ensures better compatibility in terms of vacuum performance, control interfaces, and maintenance protocols.

5. **Moderate Power Consumption**

While not the most energy-efficient pump on the market, it operates within reasonable power limits for a laboratory setting, typically consuming around **1.5 2 kW** depending on load.

6. **Easy Maintenance and Serviceability**

The pump is designed for straightforward oil changes and minor servicing, which can be performed in-house with basic tools. Agilent/Varian also provides support and replacement parts, reducing downtime.

7. **Proven Track Record**

The DS402 has been widely used in research and industrial laboratories for decades, with a strong reputation for reliability in GC/MS applications.

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#### **Cons**

1. **Higher Upfront Cost**

The DS402 is a premium pump, and its price (typically **$3,000 $5,000 USD** depending on configuration) is higher than some generic or aftermarket alternatives. Laboratories on tight budgets may need to justify the expense.

2. **Oil-Based Operation**

Like most rotary vane pumps, the DS402 requires oil lubrication, which means regular oil changes (every **1,000 2,000 hours** of use) are necessary. Contaminated oil can degrade performance and reduce pump life if not maintained properly.

3. **Limited Ultimate Vacuum for Some Applications**

While sufficient for GC/MS backing, the DS402 may not achieve as low vacuums as turbo or diffusion pumps. For applications requiring ultra-high vacuum (UHV), additional fore-pumping stages may be needed.

4. **Size and Space Requirements**

The DS402 is a relatively large pump, requiring dedicated space in the laboratory. Smaller labs or those with limited bench space may find it cumbersome.

5. **Potential for Oil Contamination Risks**

If not properly maintained, oil can leak or degrade, potentially contaminating the GC/MS system. This risk is mitigated by using high-quality oil and following maintenance schedules, but it remains a consideration.

6. **Dependence on Agilent/Varian Support**

While Agilent provides good technical support, some users may prefer pumps from more widely available brands (e.g., Edwards, Leybold, or Busch) that offer broader aftermarket parts and service options.

7. **Noise Compared to Modern Alternatives**

While quieter than many older pumps, some newer dry or hybrid pumps (e.g., dry screw pumps) may offer lower noise levels without oil maintenance.

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### **Recommendation**

The **Agilent DS402 Varian Dual Rotary Vane Vacuum Pump** is an excellent choice for laboratories running **GC/MS systems** that require a reliable, high-performance backing pump. Its **dual vane design, durability, and compatibility with Agilent/Varian instruments** make it a trusted workhorse in analytical laboratories. However, its **higher cost, oil-based operation, and space requirements** may not suit all budgets or setups.

- You are using an **Agilent/Varian GC/MS system** and need a pump that integrates seamlessly.

- You prioritize **reliability, low maintenance (relative to other oil pumps), and quiet operation**.

- Your lab has **sufficient space and budget** for a premium pump.

- You are willing to **perform regular oil changes** to ensure longevity.

- You need **ultra-low noise or oil-free operation** (e.g., dry screw pumps like the **Busch DP 2.5** or **Edwards XDS**).

- Your budget is tight, and you can find a **high-quality used or refurbished DS402** at a lower cost.

- You require **higher ultimate vacuum levels** (e.g., for some MS or UHV applications), in which case a **turbo pump or diffusion pump** may be needed in conjunction with a fore-pump.

- You prefer **more widely available parts and service options** from non-proprietary brands.

For most **standard GC/MS applications**, the DS402 remains a **strong, well-supported choice** that justifies its cost with dependable performance. However, always compare it with newer technologies (e.g., dry pumps) if noise reduction or oil-free operation is a priority.

Details:

New shaft seal, O-rings, and gaskets. This unit is ideal for laboratory and analytical applications requiring dependable performance. Four Lakes Instruments - Specializing in Vacuum Pumps, Plasma Diagnostics, and Scientific Equipment. Flushed oil channels and cleaned rotor/stater assembly.

Vacuum ovens, desiccators, glove boxes. Varian V-70, V-81, V-250, V-301 turbo pumps. Equipment supported: Varian Saturn 2000 /2100/22 320-MS, 390-MS, 430-MS, 4000-series triple quad, CP-3800 with MS detector. GC/MS, SEM, FTIR, and mass spectrometer interfaces.

Motor verified for clean startup and proper draw. Foam-packed and boxed for safe transport. Manufacturer Specifications: model: VARIAN DS402. Ideal For: Research, analytical, and university labs.

Rebuild Details: Rebuilt w/ DS602 pumping body for improved performance 50% speed.

part #: ds402 prices

• $750.00-$1399.00

specifications valvplu:

• brand: Agilent
• mpn: Ds402
• part type: Vacuum Pump
• maximum power: 1.25 Hp
• unit type: Unit
• ultimate vacuum: 5 Mtorr
• maximum flow rate: 18.3 Cfm
• number of stages: Dual Stage
• country of origin: Italy

payments valvplu:

• wallet: Google-pay
• other
• credit card: Visa

seller valvplu:

• # reviews: 25
• city: Madison, Wisconsin
• rating: 100.0%

returns valvplu:

• method: Money back
• time: 14 Days
• policy: Returns Accepted
• paid by: Buyer

offer valvplu:

• quantity: 1
• options: Ship-to-home
• started: May 24, 2026
• best offers: True
• sold: 0
• availability: In Stock

shipping valvplu:

• transit: 4-6 Days
• carrier: UPS
• service: UPS Ground
• cost: $83.40
• type: Calculated
• class: Standard

general valvplu:

• Pumps Pump Accessories > Vacuum Pumps > Rotary Vane Pumps
• condition: Seller refurbished

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