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 / min, without the use of any cooled cold cap. This Agilent Varian VHS-250 Diffusion Pump Includes:

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 / min, without the use of any cooled cold cap. This Agilent Varian VHS-250 Diffusion Pump Includes:

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 / min, without the use of any cooled cold cap. This Agilent Varian VHS-250 Diffusion Pump Includes:

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

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 Box Insulator

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.

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.

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.

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.

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.

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. For location see item #19 on illustration below.

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.

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.

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.

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.

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.

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.

This is the Agilent Varian VHS-250 diffusion pump heater cover. See No. 13 below in illustration for pump heater cover location.

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.

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.

Agilent Varian Thermocouple for measuring temperature of diffusion vacuum pumps. One end is connected to the diffusion pump the other end is connected to a temperature gauge. Agilent Varian Part Number 642906115