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Out of Stock   Agilent Varian VHS-4 ISO160, Water Cooled Diffusion Pump, 9 in.OD, Std. Cold Cap 240V 1450W L6256302 6025


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Agilent Varian VHS-4 ISO160, Water Cooled Diffusion Pump, 9 in.OD, Std. Cold Cap 240V 1450W L6256302

Agilent Varian VHS-4 Water Cooled Vacuum Diffusion Pump, ISO 160K Inlet Flange, 9 inch OD, Maximum Pumping Speed 1200 l/s
Standard Cold Cap, 240 VAC 1450 Watt Heater, Agilent Varian Part Number L6256302

The Agilent Varian VHS-4 has been designed to fill a special need in applications where high pumping speeds are required and space limitations demand a compact pump. This VHS-4 is the smallest of the VHS series pumps being well suited for laboratory and research use. The VHS-4 pump is a rugged, general-purpose unit with an operating range of 2 x 10-3 to <5 x 10-9 Torr. The Agilent Varian VHS-4 is ideal for applications requiring fast cycling because of its high pumping speed (maximum rated at 1200 l/s) air combined with high forepressure tolerance (0.65 Torr with no-load and 0.55 Torr when at full gas load). Backstreaming rate of the unit is 1x10-4 mg/cm2/ min, without the use of any cooled cold cap.

This Agilent Varian VHS-4 Diffusion Pump Includes:
  • IS0 160K Inlet Flange (No bolt holes, attached with 4 to 8 claw clamps)
  • KF40 Outlet Flange
  • Standard Cold Cap
  • 1200 l/s Maximum Pumping Speed Air
  • 240 VAC @ 1450 Watt Heater
  • 4 Water Connections 3/8 in. FPT Pipe, 1/8 Barbed
  • Ceramic Bushing
  • Centering ring for ISO foreline flange, KF40
  • Installation and Operation Manual
  • Designed To Be Used With Santovac 5 Diffusion Pump Oil
Diffusion pumps use a high-speed jet of vapor to direct gas molecules in the pump throat down into the bottom of the pump and out the outlet. The oil diffusion pump is operated with an oil that has low vapor pressure (Santovac 5 oil)). Its purpose is to achieve higher vacuum (lower pressure) than possible by use of positive displacement pumps alone. The Agilent Varian VHS-4 can pump down to pressures of <5x10-9 Torr. Diffusion pumps cannot discharge directly into the atmosphere, so a mechanical forepump, roughing pump is typically used to maintain an outlet pressure around 1 mTorr.

These Agilent Varian Diffusion Pumps are very reliable, simple in design and operate with no noise or vibration. Diffusion pumps are still the most economical means for creating high-vacuum pressures. Diffusion pumps also tolerate operating conditions such as excess particles and reactive gases that would destroy other types of high-vacuum pumps. They can be ordered with a 1-phase 115, 208, 240 VAC heater harness and with standard or extended cold cap. We stock and sell Santovac 5 diffusion pump fluids for this pump. Please see below in our “Related” section for additional accessories that may benefit your vacuum applications and maintenance needs. We offer a large variety of vacuum greases, oils, vacuum fittings, hoses, vacuum gauges, sensors/transducers, parts and accessories sold separately on this website.

These Agilent Varian VHS-4 diffusion pumps have ISO 160K inlet flange, operate on 1-phase 240 VAC, standard cold cap and has Agilent Varian part number L6256302. The Agilent Varian VHS-4 diffusion pump user's instruction manuals can be downloaded in PDF format below. These are typical stock items that often ship same day as order is placed.

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Specification Value
Pumping Speed, Operating Range 750 l/s air, 940l/s He/H₂
Maximum Pumping Speed 1,200 l/s air w/standard cold cap; 950 w/extended cold cap
Maximum Throughput 1.5 T-l/s (2.0 mbar-l/s) in operating range, 2.5 T-l/s (3.2 mbar-l/s) @ 0.01 Torr
Operating Range 2x10⁻³ to < 5x10⁻⁹ Torr (2.7 x 10⁻³ < 6.5 x 10⁻⁹ mbar)
Maximum Forepressure No Load: 0.65 Torr (0.86 mbar)
Full Load: 0.55 Torr (0.73 mbar)
Recommended Backing Pump ≥ 10 cfm (17 m³/hr)
Backstreaming Rate < 5x10⁻⁴ mg/cm²/min (with standard cold cap)
Warmup Time 10 minutes
Cooldown Time 10 minutes (with quick cool coil)
Fluid Charge 300 cc
Electrical Requirements 1 ph, 50/60 Hz, 120/208/240 VAC
Pump Power 1,450 Watts
Cooling Water Requirements 0.5 gpm (30 l/h) at 60-80 °F (15-26 °C)
Water Connections 1/8 in. FPT Tee

VHS-4 Diffusion Pump Replacement Parts List

Description Part No. Item
Standard Cold Cap Assembly 86488301 1
Extended Cold Cap Assembly F6898301 2
Sight Glass Repair Kit consisting of: L8908301 3
   Sight Glass L8816001 5.1
   Gasket, Teflon L9694001 5.1
   O-ring, Viton, Parker No. 2-113 CommI 5.1
   O-ring, Viton, Parker No. 2-226 CommI 5.1
Jet Assembly F4785301 4
Splash Baffle F4780301 5
Foreline Baffle Assembly 86754301 6
Thermal Switch Includes: L8912301 7
   Switch (set at 300 °F – 147 °C) 642906025 7a
   Lug 648056680 7b
   Wire 656179100 5.1
   Box Insulator 89867001 7d
Heaters (one heater required per pump) 8
   120 V / 1450 watt Heater Element 647304205 5.1
   208 V / 1450 watt Heater Element 647304210 5.1
   240 V / 450 watt Heater Assembly 647304250 5.1
VHS-4 heater wire, 10 AWG, 24 inches (3 per pump required) X3901-68001 9
Lugs, Replacement, nickel 648056680 10
Heater Clamp 88164301 11
Heater Insulation 86087001 12
Baffle Retaining Ring 699992156 13
O-Ring Kit includes: K0377183 14
   3 Butyl inlet flange O-ring, Parker No. 2-258 5.1
   10 Viton fill and drain O-rings (old style), Parker No. 2-112 5.1
   10 Viton fill and drain O-rings (new style, Parker No. 2-113 5.1
   1 Sight glass O-ring, Parker No. 2-226 5.1
   1 PTFE gasket 5.1
Screw, Rd hd machine, no. 8-32x31/416, stainless steel Screw 15
Stud, no. 8-32 x 1/2, stainless steel Stud 16
Screw, Socket hd cap, no. 8-32x11/44, stainless steel Screw 17
Centering ring for ISO inlet flange, 160K IC160SV 18
Centering ring for ISO foreline flange, KF40 KC40SV 19
Santovac 5 diffusion pump fluid, 500 cc 695405005
Installation and Operation Manual 699901021
PDF Logo Agilent Varian VHS4 VHS6 & VHS250 Diffusion Vacuum Pumps.pdf

PDF Logo Agilent Varian Diffusion Pumps Catalog.PDF

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Ideal Vacuum Products, LLC
5910 Midway Park Blvd NE,
Albuquerque, NM 87109-5805

Phone: (505) 872-0037
Fax: (505) 872-9001

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