Foreline Traps and Sorbents

Foreline Traps

Inline Style Foreline Trap and Right Angle Foreline Trap

Highly recommended to prevent oil backstreaming from rotary vane pumps. Keeps your vacuum system clean in applications where pumps are running constantly such as mass spectrometer, electron microscope, and vacuum drying systems. Protect vacuum gauges when mounted in front of the gauges. Includes a 150ml Activated Alumina charge (renew the charge every 3 months with #92090-50).

Available with both NW/KF 16 and NW/KF 25 flanges and, with appropriate flange selection, are compatible with the RVP, VRP, Pfeiffer DUO 3.0, VRI-4, and VRI-8 pumps available. Compatible with smaller VRI-2 #92092/92092-230 pump with addition of Connection Kit #92090-VRI. See Technical Notes for #92090-VRI (483KB PDF).

These compact, reliable and efficient foreline traps offer maximum mounting flexibility and have the following features:

• Orientation in any direction - spring-loaded sorbent basket
• Positive creep-proof design with O-ring seal
• Suitable for pumps up to 34m³/hr, 20cfm, 550 ltr/min
• Leak tested to better than 2 x 10^-9 scc/sec
• Available in both Right Angle and Inline design
• No tools needed for easy sorbent replacement
• Aluminum body and sorbent basket, 316 StS spring
• Color may be black or aluminum

PELCO® Activated Alumina Sorbent for Foreline Traps

The activated alumina sorbent is used in foreline traps to prevent backstreaming from rotary pumps or to shield vacuum gauges from contamination. PELCO® Activated Alumina Sorbent can be used in foreline traps from VRL, BOC-Edwards, Alcatel/Adixen, Varian, Leybold, Sargent-Welch, Ulvac and other brands. The small pores (2-50nm) and the non uniform pore distribution in the PELCO® Activated Alumina Sorbent provide the large surface area of 350 m²/gram. With this large internal surface area, the activated alumina sorbent attracts and holds gas molecules to which it is exposed. PELCO® Activated Alumina Sorbent is activated at 350°C (662°F) to less than 1% water and it is capable of holding 43% water (by weight) or in the foreline trap application, oil. The relatively uniform 1/4" diameter size makes it ideally suited for charging perforated mesh canisters as used in foreline traps.

Also recommended for drying gases and refrigerants and for applications where extremely low dew points are desirable.

Packed in a 450ml metal can with sealed lid.

SDS (92KB PDF)