Float Switches are inexpensive and efficient liquid level
detectors. They are simple to install, and designed for
trouble free operation over a long life.
The LR08 is a plastic float switch using either a PVC or
synthetic rubber 3 core cable. Actuation is via a roller
ball and micro-switch arrangement within the switch
thereby eliminating all heavy metals from this version.
Construction
The unit comprises three major components:
1. The float chamber houses the micro-switch
arrangement, totally sealed within a polypropylene
casing, with a single pole double throw action.
2. The three-cored cable, connected to the micro-switch
assembly inside the float chamber, is sheathed in CPE
(chlorinated polyethylene) synthetic rubber or PVC. This
cable is supplied in three standard lengths, 5 metres, 10
metres and 20 metres ±5% of the length quoted.
Mounting
Whilst no hard and fast rules apply to the mounting of
these units, the lead should be supported in an enclosed
vessel, and in an open vessel it is advantageous to clip
the lead to the side, especially if excessive turbulence is
experienced.
To obviate the effffects of rapid switching conditions that
would result if such turbulence is experienced, it is
advantageous to use a maintaining circuit which both
safeguards the micro-switch and cuts out any chatter in
the starters of associated pumps etc.
Contact rating:
250V 15A, non-inductive.
250V 10A, inductive. 1.3 HP
NOTE : Local regulations may limit the voltage.
Max. temperature 70° C
Max. submerged depth 20 metres
Compressive Strength 482 KN/m² (70 lbf/in²)
Operational in specific gravities from 0.8 to 1.3
Chemical Resistance
Against Rating
Lubricants Fair
Diesel oil & petrol Poor
Vegetable & animal fats Good
Water Absorption Good
Oxidation Good
Ozone Good
Sunlight Good
Dilute Acids Good
Alkalis Good
Alcohols Good
Salt water Good