INFICON Sensistor ILS500F Leak Detection System - Manual (Page 65)

65 Maintenance Instructions
ninp69e1-a (1410)
9.2.4 Replacing the Venturi Pump
1 Remove the exhaust hose from the barbed hose fitting
2 Unscrew and remove the barbed hose fitting and the plastic washer.
3 Use a 4 mm Allen key to remove the four screws holding the Venturi pump.
4 Remove the o-ring under the Venturi. Remove the hose from Venturi inlet.
Push hose into connector and press orange ring down to release hose, then pull
hose out.
5 Remove the hose fitting from the Venturi.