The forepump provides the vacuum for the API source and backing pressure for the turbomolecular pump in the mass spectrometer. The forepump eventually exhausts much of what is introduced into the mass spectrometer. It is your responsibility to provide an adequate exhaust system.
You must connect the forepump to an active fume exhaust system. Connect the exhaust port of the forepump to an exhaust gas line that leads to an active exhaust system. The inner diameter of the pipe should be at least 25 mm (1 in.). An exhaust hose for connecting it to the exhaust system comes with the system. It has dimensions of 13 mm (½ in.) ID and 20 mm (25⁄32 in.) OD and is 5 m (16 ft) long. Ensure that the inlet pressure of the active exhaust system is not differing more than 100 mbar from atmospheric pressure.
Parameter | Requirement |
|---|---|
Initial inrush flow rate | 10 L/min (21.2 ft3/h) |
Continuous flow rate | 7 L/min (14.8 ft3/h) |
Maximum flow rate | 50 L/min (106 ft3/h) |
NOTICE
Do not vent the drain tubing (or any vent tubing connected to the waste container) to the same fume exhaust system to which you have connected the forepump. Use independent and completely separated active exhaust systems. Ensure that the inlet pressure of the active exhaust system is not differing more than 100 mbar from atmospheric pressure.
The maximum length for the exhaust hose of the forepump is 10 m.
Do not route the exhaust tubing from the pump vertically toward the ceiling. To maintain the pump integrity, route the tubing from the exhaust port down to the floor.
The exhaust hose must travel at floor level for a minimum of two meters (78 ½ in.) before it reaches the external exhaust system. This tubing acts as a trap for exhaust fumes that would otherwise recondense.