Agilent Varian VHS-250 Water Cooled Vacuum Diffusion Pump, ISO 250F ASA Bolted Inlet, 13.125 inch OD, Max. Pumping Speed 3700 l/s Standard Cold Cap, 120 VAC 2200 Watt Heater, Agilent Varian Part Number K0543301. The Agilent Varian VHS-250 has been designed to fill a special need in applications where high pumping speeds are required and space limitations demand a compact pump. The VHS-250 pump is a rugged, general-purpose unit with an operating range of 1.2 x 10-3 to <5 x 10-9 Torr. The Agilent Varian VHS-250 is ideal for applications requiring fast cycling because of its high pumping speed (maximum rated at 3700 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-250 Diffusion Pump Includes: ISO 250F Inlet Flange (13.25 Inch OD Flange, 12 Smooth Bolt Holes, 0.5" Diameter Holes) 1 1/2 inch ASA Outlet Foreline Flange (5 Inch OD) Standard Cold Cap Recommended Backing/Roughing Pump: 17CFM 3700 l/s Maximum Pumping Speed Air 120 VAC @ 2200 Watt Heater 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. Its purpose is to achieve higher vacuum (lower pressure) than possible by use of positive displacement pumps alone. The Agilent Varian VHS-250 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 120, 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-250 diffusion pumps have ISO 250F inlet flange, operate on 1-phase 120 VAC, standard cold cap and has Agilent Varian part number K0543301. The Agilent Varian VHS-250 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.

Agilent Varian VHS-250 Water Cooled Vacuum Diffusion Pump, ISO 250F ASA Bolted Inlet, 13.125 inch OD, Max. Pumping Speed 3700 l/s Standard Cold Cap, 208 VAC 2200 Watt Heater, Agilent Varian Part Number K0543306. The Agilent Varian VHS-250 has been designed to fill a special need in applications where high pumping speeds are required and space limitations demand a compact pump. The VHS-250 pump is a rugged, general-purpose unit with an operating range of 1.2 x 10-3 to <5 x 10-9 Torr. The Agilent Varian VHS-250 is ideal for applications requiring fast cycling because of its high pumping speed (maximum rated at 3700 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-250 Diffusion Pump Includes: ISO 250F Inlet Flange (13.125 Inch OD Flange, 12 Smooth Bolt Holes, 0.5" Diameter Holes) 1 1/2 inch ASA Outlet Foreline Flange (5 Inch OD) Standard Cold Cap Recommend Backing/Roughing Pump: 17CFM 3700 l/s Maximum Pumping Speed Air 208 VAC @ 2200 Watt Heater 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. Its purpose is to achieve higher vacuum (lower pressure) than possible by use of positive displacement pumps alone. The Agilent Varian VHS-250 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 120, 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-250 diffusion pumps have ISO 250F inlet flange, operate on 1-phase 208 VAC, standard cold cap and has Agilent Varian part number K0543306. The Agilent Varian VHS-250 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.

Agilent Varian VHS-250 Water Cooled Vacuum Diffusion Pump, ISO 250F ASA Bolted Inlet, 13.125 inch OD, Max. Pumping Speed 3700 l/s Standard Cold Cap, 240 VAC 2200 Watt Heater, Agilent Varian Part Number K0543302. The Agilent Varian VHS-250 has been designed to fill a special need in applications where high pumping speeds are required and space limitations demand a compact pump. The VHS-250 pump is a rugged, general-purpose unit with an operating range of 1.2 x 10-3 to <5 x 10-9 Torr. The Agilent Varian VHS-250 is ideal for applications requiring fast cycling because of its high pumping speed (maximum rated at 3700 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 5x10-4 mg/cm2/ min, without the use of any cooled cold cap. This Agilent Varian VHS-250 Diffusion Pump Includes: ISO 250F Inlet Flange (13.25 Inch OD Flange, 12 Smooth Bolt Holes, 0.5" Diameter Holes) 1 1/2 inch ASA Outlet Foreline Flange (5 Inch OD) Standard Cold Cap Recommendeded Backing/Roughing Pump: 17CFM 3700 l/s Maximum Pumping Speed Air 240 VAC @ 2200 Watt Heater 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. Its purpose is to achieve higher vacuum (lower pressure) than possible by use of positive displacement pumps alone. The Agilent Varian VHS-250 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 120, 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-250 diffusion pumps have ISO 250F inlet flange, operate on 1-phase 240 VAC, standard cold cap and has Agilent Varian part number K0543302. The Agilent Varian VHS-250 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.

Agilent Varian Thermal Switch for VHS-4, 6,10, 250, & 400 Diffusion Pumps PN 642906025 This is the Agilent Varian VHS-4, VHS-6, VHS-10, VHS-250, VHS-400 Diffusion Pump replacement Thermal Switch. (Set at 300º F, 148º C). See No. 15 below in illustration for thermal switch location on a VHS-4

Agilent Varian VHS-250, Diffusion Pump Thermal Switch Kit. Agilent Varian PN L8912301 This is a Thermal Switch Kit. Fits the Agilent Varian VHS-250 Diffusion Pump. For location of the baffle retaining ring see item #7 on (diagram exploded view & parts illustration) below. This Thermal Switch Kit includes: Thermal Switch Lug Wire Box Insulator

Agilent Varian VHS-250 Diffusion Pump Heater Wire, 10 AWG, 36 inch length. PN X3901-68002 This is the Agilent Varian VHS-250 Diffusion Pump stranded nickel heater wire, 10 AWG, 36 inches long. (3 - 36 inch lengths required for total replacement per pump). See No. 9 below in illustration for heater wire location.

Agilent Varian Standard Cold Cap for VHS-250 Diffusion Pump Agilent Varian Part Number F9584301 This is the standard cold cap for the VHS-250 Diffusion Pump. For location of standard cold cap see item #1 on (diagram exploded view & parts illustration) below.

Agilent Varian VHS-6 & VHS-250 Foreline Baffle Assembly, Diffusion Pump Replacement Parts Agilent Varian Part Number L9172301 These Agilent Varian VHS-6 & VHS-250 diffusion pump replacement foreline baffle assemblies are OEM Agilent Varian replacement parts with part number L9172301. The foreline baffle is located in the roughing line exhaust arm of the diffusion pump. They are designed to help prevent diffusion pump oil from being transported to the roughing pump under high throughput conditions. See the VHS-6 diffusion pump roughing line arm noted by balloon #6 in the illustration below.

Agilent Varian VHS-250, Diffusion Pump Jet Tube Assembly and Splash Baffle.Agilent Varian PN F9548301 This is a replacement jet tube assembly and splash baffle. Fits the Agilent Varian VHS-250 Diffusion Pump. For location of the jet tube and splash baffle assembly see item #3 on (diagram exploded view & parts illustration) below.

Agilent Varian VHS-250, Diffusion Pump Baffle Retaining Ring. Agilent Varian PN 699992187 This is a replacement baffle retaining ring. Fits the Agilent Varian VHS-250 Diffusion Pump. For location of the baffle retaining ring see item #6 on (diagram exploded view & parts illustration) below.

Agilent Varian VHS-250 Diffusion Pump O-Ring Kit. Agient Varian PN K0377184 This is the Agilent Varian VHS-250 Diffusion Pump O-Ring Kit. O-Ring Kit Contains: 3 Butyl inlet flange O-ring, Parker No. 2-267 3-Butyl-N foreline flange O-ring, Parker No. 2-332 10 Viton fill and drain O-rings (old style), Parker No. 2-112 10 Viton fill and drain O-rings (new style, Parker No. 2-113 1 PTFE gasket 1 Sight glass O-ring, Parker No. 2-226

Agilent Varian VHS-250 Air Cooled Diffusion Pump Replacement Standoff Ceramic Bushing Insulator, for Cold Cap.Agilent Varian PN 699006025 Agilent Varian VHS-250 Air Cooled Diffusion Pump Replacement Standoff Ceramic Bushing Insulator, for Cold Cap. For location see item #19 on illustration below.

Agilent Varian VHS-250 Diffusion Pump Lugs for Heater Wire, 1 each. Varian Agilnet PN 648056680 This is the Agilent Varian VHS-250 diffusion pump heater wire lugs, (sold as one each.) See No. 10 below in illustration for heater wire lugs location.

Agilent Varian VHS-250, Diffusion Pump Sight Glass Kit Replacement Part. Agilent Varian PN L8908301 This is a replacement Sight Glass Kit. Fits the Agilent Varian VHS-250 Diffusion Pump. For location of the sight glass kit see item #2 on (diagram exploded view & parts illustration) below.

Agilent Varian VHS-6 Diffusion Pump Replacement Heater, StoveTop Style, 120VAC, 2200W, 18.3A, 6.6OhmsAgilent Varian Part Number 647306125 These Agilent Varian VHS-6 & VHS-250 heaters are OEM Agilent Varian replacement parts for the VHS-6 diffusion vacuum pumps with part number 647306125. These replacement diffusion pump heaters are designed to operate on 120 VAC producing 2200 watt of heat for a VHS-6, VHS-250 diffusion pump. These heater element pull 18.3 Amps at 120 VAC and have a 6.6 Ohms resistance across the element. These Agilent Varian VHS-6 heaters are shown as #8 in the illustration below.

Agilent Varian VHS-6 & VHS-250 Diffusion Pump Replacement Heater, 208VAC, 2200W, 10.6A, 19.6 OhmsAgilent Varian Part Number 647306175 These Agilent Varian VHS-6 & VHS-250 heaters are OEM Agilent Varian replacement parts for the VHS-6 diffusion vacuum pumps with part number 647306175. These replacement diffusion pump heaters are designed to operate on 120 VAC producing 2200 watt of heat for a VHS-6, VHS-250 diffusion pump. These heater element pull 10.6 Amps at 208 VAC and have a 19.6 Ohms resistance across the element. These Agilent Varian VHS-6 heaters are shown as #8 in the illustration below.

Agilent Varian VHS-6 & VHS-250 Diffusion Pump Replacement Heater, 240VAC, 2200W, 9.2A, 26 Ohms Agilent Varian Part Number 647306225 These Agilent Varian VHS-6 & VHS-250 heaters are OEM Agilent Varian replacement parts for the VHS-6 diffusion vacuum pumps with part number 647306225. These replacement diffusion pump heaters are designed to operate on 120 VAC producing 2200 watt of heat for a VHS-6 & VHS-250 diffusion pump. These heater elements pull 9.2 Amps at 208 VAC and have a 26 Ohms resistance across the element. These Agilent Varian VHS-6 heaters are shown as #8 in the illustration below.

Agilent Varian VHS-6 & VHS-250 Diffusion Pump Heater Clamp Assembly. Agilent Varian Part Number 86643301 These Agilent Varian VHS-6 & VHS-250 diffusion pump heater clamp assemblies are OEM Agilent Varian replacement parts with part number 86643301. These clampling plates help transfer heat from the diffusion pump heater to the oil inside the pump. these clamping plate kits include: clamping plate, cover plate, and insulator, see #11 abc below in the illustration below.

Agilent Varian VHS-250 Diffusion Pump Heater Cover. PN L8997001 This is the Agilent Varian VHS-250 diffusion pump heater cover. See No. 13 below in illustration for pump heater cover location.

Agilent Varian Bolts to Attach ASA Gate Valves to ASA Diffusion Pumps 3/4-10 1-1/4" Length Hex Bolt - Course Thread, 1 each. These are bolts to attach ASA Gate Valves to ASA Diffusion pumps, ASA sizes 6, 8 and 10 inch. One each, size 3/4-10 1-1/4" Length Hex Bolt - Course Thread.

Varian VHS-250 Old-Style Diffusion Pump Thermal Overload Switch Aluminum Cover Box These Varian VHS-250 diffusion vacuum pump replacement thermal overload switch covers are made of aluminum. They also include the replacement mounting hardware. The thermal switch is used to protect the diffusion pump from over heating which typically occurs from lack of cooling water.