Agilent Varian VHS-400 Water Cooled Vacuum Diffusion Pump, ASA Special Non-Standard, 18 inch OD, Maximum Pumping Speed 8000 l/s Air
Standard Cold Cap, (2) 208 VAC 2200 Watt Heaters, Agilent Varian Part Number K4816307.

The Agilent Varian VHS-400 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-400 pump is a rugged, general-purpose unit with an operating range of 1.4 x 10-3 to <5 x 10-9 Torr at 4400W. The Agilent Varian VHS-400 is ideal for applications requiring fast cycling because of its high pumping speed (maximum rated at 8000 l/s with standard cold cap) 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 1x10-3 mg/cm2/ min, without the use of any cooled cold cap.

This Agilent Varian VHS-400 Diffusion Pump Includes:
ASA Special Non-Standard (18 in. OD) 12 Bolt Holes (0.3 in. diameter holes)
ASA 2 in. (6 in. OD) No bolt holes (0.75 in. diameter holes)
Standard Cold Cap
Recommended Roughing Backing Pump: 30 CFM
8000 l/s Maximum Pumping Speed Air
208 VAC 3 ph (4400W) with (2) 2200 Watt Heaters
Water Connections 1/8 in. FPT Tee
Designed To Be Used With Santovac 5 or IVP 704 Diffusion Pump Oil, 1000cc (1.056 Qt.) full charge