PRECISION� DIFFUSION PUMP SYSTEM
Click Image to View Full-Size	The Precision� Diffusion Pump is a high performance, high vacuum secondary pump specifically designed and manufactured for neon and cold cathode production. The Diffusion Pump can be easily adapted to fit any pumping system and will improve the performance of virtually every vacuum pump. It works in unison with the mechanical vacuum pump producing higher pumping speeds and better ultimate vacuums, especially at low pressures when more performance is needed. Most importantly, the faster pumping speed and better vacuum achieved with a Diffusion Pump help produce a cleaner, longer lasting tube. DIFFUSION PUMP BODY, STANDARD. ADAPTER TO MANIFOLD (sold separately). HEATER CONTROL. HEATER. ISOLATION/VENT VALVE (sold separately).
FEATURES: PUMPING SPEED � The Precision Diffusion Pump can achieve a maximum pumping speed of 10 liters per second at pressure of 10-5 Torr. ULTIMATE VACUUM � A no load ultimate vacuum of 10-5 Torr can be consistently realized in a clean manifold at normal shop temperature of 70� F to 75� F. HIGH VACUUM � When used in conjunction with an appropriate vacuum pump, high vacuum can be obtained in a matter of a few seconds. NO VAPOR BACKSTREAMING � Vapor backstreaming is virtually eliminated when used with recommended fluid and an appropriate vacuum pump. IMPROVED PROCESSING � The Precision Diffusion Pump provides much faster evacuation and a better ultimate vacuum resulting in higher quality, longer lasting tubes.
OPTIONS: Precision� Diffusion Pump Standard has an 18mm port to the vacuum pump and 25mm port to the manifold. Designed for use with the Precision� SE and Precision� DE Manifolds. May be adapted to any other manifold. Precision� Diffusion Pump High Flow has a 25mm port to the vacuum pump and manifold. Designed for use with the Precision II High Flow Manifold. May be adapted to any other manifold. Diffusion Pump Isolation/Vent Valve allows the system to remain under vacuum when not in use while venting the vacuum pump. Diffusion Pump to Manifold Adapter allows connection between the diffusion pump and manifold.

 

VACUUM PUMPS
Welch and Marvac Scientific HIGH VACUUM PUMPS are designed for many years of dependable service. Ideal for neon processing, these two-stage rotary vane pumps provide stable pumping efficiency even in the low micron range. Available in both belt drive and direct drive in 115 or 230 volt models, they are built for long life and ease of maintenance.
Marvac Scientific Belt Drive with Standard Filter 2.65 CFM (75 L/min) Marvac Scientific Belt Drive with Standard Filter 5.5 CFM (155 L/min)         Welch 1402 Belt Drive with Air Breather 5.6 CFM (160 L/min) Welch 1376 Belt Drive with Air Breather 10.6 CFM (300 L/min) Welch 1397 Belt Drive with Standard Filter 17.7 CFM (500 L/min)         Welch 8912 Direct Drive without Filter 3.8 CFM (108 L/min) Welch 8917 Direct Drive without Filter 6.1 CFM (173 L/min) Welch 8920 Direct Drive without Filter 7.7 CFM (218 L/min) Welch 8925 Direct Drive without Filter 11.3 CFM (320 L/min)

 

VACUUM GAUGES
PRECISION VACUUM GAUGES allow the operator to precisely monitor tube pressure during evacuation. These gauges include rugged but sensitive gauge tubes for excellent stability, accuracy, and reliability. Good to determine ultimate vacuum, slight leaks, outgassing and integrity of the system. With all vacuum gauges, a stopcock should be installed between the manifold and the vacuum gauge tube in order to isolate the vacuum gauge during bombarding. This stopcock also protects the gauge tube from any influx of contaminants when venting the manifold to atmosphere.
PRECISION VACUUM GAUGE II has a range of 0-100 microns and is good for cold cathode and all neon applications. Accuracy rating is � 1% AMD (@ 1 is � .2). Available for 115 or 230 volt applications.	PRECISION VACUUM GAUGE III has a range of 0-1000 microns and is good for all neon applications to determine if manifold consistently pulls below 5 microns. Accuracy rating is � 2% AMD (@ 5 is � 1.5). Available for 115 or 230 volt applications.	DIGITAL VACUUM GAUGE has a range of 0-200 microns and is good for all neon applications. It is a compact battery powered unit with fast, accurate, and easy-to-read digital display.