This listing is for a WONDERFUL OPERATIONAL Condition TESTED VARIAN VHS-4 DIFFUSION PUMP BFA CRYOSTAT VACUUM IONIZATION SD-300 COLD TRAP 843 ION GAUGE + VALVE for VARIAN CRYOSTAT SYSTEM as can be seen in the pictures.
Unit came from a Federal University which fully tested it and guarantees it is working perfectly, please read the university's test results below:
“Fully tested, in great working condition. The TC gauge demonstrates that vacuum is being pulled matching the other TC or the test gauge.
Both pumps operate exceptionally. The entire system is in excellent cosmetic condition. See images for more details.
Pumping Speed: 1200 l/s Air
Foreline Port Diameter: KF-25 Brand:
Varian/Agilent
Cooling Method: Water-Cooled Fluid Charge: 300 cc
Supply Voltage: Currently Wired with 125 V 30 A Plug
Inlet Flange Diameter: KF40
MPN: VHS-4
For Sale: VHS-4 Diffusion Pump System, including the VHS-4 Diffusion Pump, Liquid Nitrogen Cold Trap, Varian SD-300 Roughing Pump, 4" ASA Valve (9" diameter, adapts to KF-50), Varian 843 Ion Gauge Controller with ion gauge and two Varian thermocouple gauges, all necessary wires for gauges and power, breaker box with breakers for diffusion and roughing pump, as well as three extra outlets, and various other valves and tubing connecting the system. This is a perfect system for any laboratory high vacuum need. The system was fully tested using a cold cathode gauge and a rough gauge. The pumps and gauges all function excellently. See below for specifications of system components.
The testing equipment used included cold cathode gauge, rough gauge, cold cathode controller, and cables for these.
This Varian Cryostat System comes with everything you see in the pictures such as:
. VARIAN BFA 9.0" INCH ASA COLD TRAP
. VARIAN DIFFUSION PUMP TYPE 0187
. VARIAN 843 VACUUM IONIZATION GAUGE
. VARIAN OIL MIST ELIMINATOR 949-9395
VHS-4 Specs:
Pumping Speed, Operating Range Pumping Speed, AVS 4.1 (1963) 750 l/s air, 940 l/s He/H2 1,200 l/s Air
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 2 x 10-3 to <5 x 10-9 torr (2.7 x 10-3 to <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, Standard Cold Cap <5 x 10-4 mg/cm2/min
Warmup Time 10 minutes
Cooldown Time 10 minutes (with quick cool coil)
Fluid Charge 300 cc
Electrical Requirements 1 ph, 50/60 Hz, 120 V
Pump Power 1450 watts
Cooling Water Requirements 0.15 gpm (30 l/hr) at 60-80°F (15-26°C)
Water Connections Flare connectors
This unit has ALWAYS been very well taken care of by the university AND that's why we guarantee it for 60 days, no questions asked.
Free Shipping to Continental U.S. Ships to Alaska, Hawaii, Puerto Rico, etc. but buyer pays to ship.
