Overview
Film degasser systems are an effective—and cost-effective—solution to the challenges of degassing HPLC solvents. In vacuum degassing, the liquid phase flows along a gas-permeable membrane. A vacuum chamber on the other side of the gas-permeable membrane causes gas in the solution to migrate across the membrane, where they are then swept away (Figure 1).
Figure 1. Schematic of a Single Film Planar Degasser
The double-sided planar degasser series uses the same principle but with a unique internal architecture. A central flow plate separates two parallel pathways, each with a Teflon™ AF membrane and vacuum chamber. The eluent flows down one face of the flow plate and back along the other face (see Figure 2). This provides a large interaction area resulting in highly effective de-bubbling and very efficient degassing.
Figure 2. Schematic of a Dual-Film Planar Degasser
Advantages of Film Degassers as Replacements
Film degassers are also a cost-effective replacement for degassers which use tubular Teflon™ AF 2400 membranes. Since pump cavitation becomes more serious at higher flow rates, it is advantageous that the degassing efficiency curves of the planar degassers are flatter than those of degassers based on a tubular degassing membrane. (See Figure 3)
Model 405 Degasser Series
|
Specification |
Series 405 Degassing Chambers |
|
Size |
72 mm x 40 mm x 11 mm |
|
Liquid Connections |
¼ -28 flat bottom ports |
|
Vacuum Connections |
Hose barb for 3 mm (1/8 inch) ID tube |
|
Dead Volume |
320 microliters |
|
Wetted Materials |
PEEK and Teflon™ AF |
|
Vacuum Seal |
Less than 34 mbar (3.3 kPa) leak in 10 minutes |
|
Pressure Test |
335 kPa internal pressure and 95 kpa of applied vacuum |
|
Average Actual Pressure Drop at 1 ml/min water |
Less than 3 mbar (274 Pa) (with vacuum applied) |
|
Suitable replacement for VICI Metronics degasser models: |
9000-1000 9000-1004 9000-1006 9000-1184 9000-1009 9000-1810 9000-1818 |