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The electro-optic sensor contains an infrared LED and a light receiver. Light from the LED is directed into a prism which forms the tip of the sensor. With no liquid present, light from the LED is reflected within the prism to the receiver. When rising liquid immerses the prism, the light is refracted out into the liquid, leaving little or no light to reach the receiver. Sensing this change, the receiver actuates electronic switching within the unit to operate an external alarm or control circuit.
Any optical sensor may be affected by reflective surfaces.
Consult Gems Sensors if prism is to be less than 2 inches (51 mm) from any reflective surface.
ELS-1100 Series Single-Point Level Switch is a compact, economical, no moving parts polysulfone level sensor with built-in switching electronics. A variety of mountings, power requirements and electrical terminations are available. These level...
ELS-950 Series Single-Point Level Switch is a small, no moving parts sensor with a high operating temperature capability up to 230°F (110°C). The ELS-950's design features an over-molded electronics insert, TPE insulated wires,...
ELS-1100FLG Series Single-Point Level Switches are an ideal solution for thin wall tanks 1/4" thick (6 mm). No threads needed with these flanged units. Slip through a .75" (19 mm) hole and tighten the jam nut; a Viton® gasket forms a tight...
ELS-1150 Series Single-Point Level Switch is a high-performance sensor that features a micro-processor board design to provide a wide range of capabilities including sinking, sourcing and time delay outputs. The strong fused glass prism eliminates...
ELS-950M Series Single-Point Level Switch is ideal for industrial OEMs requiring a solid-state sensor for small space and high temperature environments. The UL approved design features a rugged brass housing, a TPE over-molded electronics insert,...
ELS-1100HT Series Single-Point Level Switch is the high temperature version of the ELS-1100 and is made from high performance Isoplast plastic. While maintaining broad chemical compatibility, these units also handle fluid temperature to 212°F...
