Used Varian Diffusion Pump LN₂ Traps

Trap	Flange	Rebuilt
332	2" ASA	$400
325	2" ASA	$850
362-4	4" ASA	$1,400
362-6	6" ASA	$1,700
362-6	10" CF	$1,700
316-10	10" ASA	$4,300

The liquid nitrogen cryotraps provide optimum performance for diffusion pumps. These LN₂ traps offer optical density intercepting 100% of primary backstreaming while giving additional pumping speed for condensables. Each trap has a large built-in reservoir that gives long, unattended service. Cryogenic temperatures are maintained even as liquid nitrogen level drops. High conductance internal geometry achieves the highest possible pumping speed at the inlet, taking full advantage of the diffusion pump's speed.

Cryotraps Features/Specs

316-10

Optically dense
Intercepts 100% of primary backstreaming
Additional pumping of condensables
Retains 50% of VHS-10 pump speed

Nominal Conductance 4,2000 l/s air, 11,000 l/s helium, 15,540 Hydrogen
Pumping speed 10,000 l/s water vapor
LN₂ Charge 9 liters
Reservoir Capacity 5.4 liters
Holding time 6 hours
Body Construction Stainless Steel

325

Optically dense
Intercepts 100% of primary backstreaming
Additional pumping of condensables
Retains 60% of pump speed

Nominal Conductance 460 l/s air, 1,000 l/s helium, 1,500 Hydrogen
Pumping speed 675 l/s water vapor
LN₂ Charge 3.5 liters
Reservoir Capacity 1.5 liters
Holding time 7.5 hours
Body Construction Stainless Steel

362-4

Optically dense
Intercepts 100% of primary backstreaming
Additional pumping of condensables
Retains 50% of M-4 pump speed

Nominal Conductance 1,100 l/s air, 29,00 l/s helium, 4,000 Hydrogen
Pumping speed 2,000 l/s water vapor
LN₂ Charge 7 liters
Reservoir Capacity 4.7 liters
Holding time 17 hours
Body Construction Stainless Steel

362-6

Optically dense
Intercepts 100% of primary backstreaming
Additional pumping of condensables
Retains 50% of M-6 pump speed

Nominal Conductance 2,000 l/s air, 5,300 l/s helium, 7,400 Hydrogen
Pumping speed 3,800 l/s water vapor
LN₂ Charge 10 liters
Reservoir Capacity 8.4 liters
Holding time 17 hours
Body Construction Stainless Steel

Valves & Baffles

Item	Fits	Price
Throttle	HS-20	$1,850
Baffle	HS-35	ask
Baffle	-	ask
Baffle	-	ask