Lone Star’s vacuum switch series (PN: LS03-01023) is intended to be used with a panel mounted annunciator, used to indicate a vacuum system failure (i.e. leakage, vacuum pump failure, etc).
The switch is normally closed and will close the contacts at 3.5″ Hg within +/- 1″ Hg on a decreasing vacuum in your vacuum system.
Vacuum switch specs:
Set Point Range: 4.0 – 8.0″ Hg
Set Point Tolerance: +/- 1″ Hg
Reset Band: 6.0 – 8.0″ Hg
Factory Set: No Field Adjustment