Flowline AVX6 Float-Point - Manual (Page 6)

6 of 14 Switch-Tek Float Series 22 AUG 08
MN801839 Rev A
Introduction
1. Switches should be installed rigidly so the float or floats are free to move as the liquid
level changes.
2. Switches should be mounted in a tank area free of severe turbulence or protected from
such turbulence by appropriate and adequate slosh shields.
3. Vertical switch stems should be vertical for best results, but satisfactory operation is
possible in most liquids with the stem at up to a 30° angle from vertical.
4. Side mount switch stems must be mounted with the arrow vertically either up or down
depending on switch operation.
5. Care should be taken that switches are always operated within electrical ratings.
6. Orientation for standard Vertical switches can be changed from normally open to
normally closed dry or vice versa by removing the float and reversing it in the stem,
except with the LV20-2101, LV20-2201, LV21-1101 and LV21-1201.
Technology
Float switches consist of a float, magnet, reed switch and body/stem with mounting threads.
When the probe is dry, the float rests on the bottom of the stem such that the magnet does not
influence the reed switch. As the probe becomes immersed in liquid, the float becomes buoyant
and the magnet elevates causing the reed switch to change state.