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Available Now:  1   Agilent Varian VHS-4 Extended Cold Cap, Diffusion Vacuum Pump Replacement Parts, PN F6898301 607

Sale: $607.00



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Agilent Varian VHS-4 Extended Cold Cap, Diffusion Vacuum Pump Replacement Parts, PN F6898301

Agilent Varian VHS-4 Extended Cold Cap, Mexican Hat, Diffusion Vacuum Pump Replacement Parts
Agilent Varian Part Number F6898301

These Agilent Varian VHS-4 extended cold caps are OEM Agilent Varian replacement parts for the VHS-4 diffusion vacuum pumps. The extended cold cap is sometimes referred to as a "Mexican Hat" due to its shape. There are two types of cold caps, standard and extended. The type of cold cap used will influence factors, such as, oil backstreaming and final pumping speed of the diffusion pump. For example, the Extended Cold Cap is an option that fits inside the VHS-4, VHS-6, and VHS-10 pumps in place of the standard cold cap. It stops backstreaming as effectively as an optically dense baffle, yet it retains 80% of the pump’s speed. Residual backstreaming is so low that it cannot be measured by the American Vacuum Society’s standard collection method. For removal installation procedures of cold cap see page 37 of instruction manual PDF below. These extended cold caps are OEM original Agilent Varian replacement parts with part number F6898301, see item #16 on (diagram exploded view & parts illustration) below.

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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 Diffusion Pumps Catalog.pdf

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5910 Midway Park Blvd NE,
Albuquerque, NM 87109-5805

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

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