INFICON Sensistor ILS500F Leak Detection System - Manual (Page 67)

67 Maintenance Instructions
ninp69e1-a (1410)
9.2.5 Replacing Gas Valves
1 Use a 3 mm Allen key to remove the four screws holding the valve to be changed.
2 Lift the old valve out and put the new valve in. Notice the correct orientation in the
picture below.
3 Tighten the screws 2-3 mm (0.08-0.12 in.) at a time moving the key from screw to
screw so that the valve doesn’t tilt much.
4 Tighten the screws and replace the cover.
5 Run through the hardware test again to test that the changed/removed valve(s)
perform as required.
6 Use hand probe to check that there is no external leakage (this part of Hardware
Test is routine).