Float Type Level Switches Single Point Small Size GEMS Level Switches operate on a direct, simple principle. In most models, a float encircling a stationary stem is equipped PERMANENT with powerful, permanent magnets. As MAGNET the float rises or lowers with liquid level, the magnetic field generated from within FLOAT the float actuates a hermetically sealed, magnetic reed switch mounted within the HERMETICALLY SEALED MAGNETIC stem. The stem is made of non-magnetic REED SWITCH metals or rugged, engineered plastics. When mounted vertically, this basic design provides a consistent accuracy of ±1/8 inch. Multi-station versions use a separate reed switch for each level point being monitored. Page Start Large Size LEVEL SWITCHES – SINGLE POINT Side-mounted units use different actuation methods because of their horizontal attitude. The basic principle, however, is the same: as a direct result of rising or falling liquid, a magnetic field is moved into the proximity of a reed switch, causing its actuation. N The durable construction of these reed switch designs ensures long, trouble-free service. Because the effects of shock, wear and vibration are minimized, these hermetically sealed switches provide precise repeatability with no more than 1% deviation. The switch actuation points remain constant over the life of the unit. See “Reed Switch Protection” in Appendix X for information on extending the life of GEMS Level Switches. GLASS ENVELOPE REED SWITCH Wide Variety Reed Switch Reliability Top/Bottom Mounting Side Mounting Slosh Shield Leak Detector Visit www.GemsSensors.com for most current information. Additional technical information can be found in Appendix X. A-1

Small Size – Engineered Plastics LS-3 Series – Offers High Reliability, Compact Size and Low Costs in NPT, Straight and Metric Threads Ideal for shallow tanks or restricted spaces, or for any low-cost, high volume use. LS-3 Series are available in FDA compliant materials, consult GEMS for details. LEVEL SWITCHES – SINGLE POINT Polysulfone Float Polypropylene Float (Hollow) Polypropylene Float (Solid) For water based liquids, with limited use in oils and chemicals. Features a low specific gravity float offering broad chemical compatibility. With Polypropylene stem and float, switch offers broad...

FLOAT TYPE How To Order – Select Part Number based on specifications required. Float Material Polypropylene (Hollow) Polypropylene3 Polypropylene3 NSF Std. 169 (Hollow) (Kynar float retaining NSF Std. 169 clip) Polypropylene (Solid) Mounting Type Electrical Termination Part Number Lead Wires Lead Wires Lead Wires Cable Cable Lead Wires LEVEL SWITCHES – SINGLE POINT Stem and Mounting Material Lead Wires Lead Wires Lead Wires Lead Wires Lead Wires Lead Wires or Cable Lead Wires Lead Wire Teflon Jacketed Lead Wires – Stock Items. Notes: 1. Based on a liquid specific gravity of 1.0. 2. All Polypropylene...

Unique Features Make These LS-3 Models Special These small switches feature unique configurations for special applications. Part No. 142545 With Slosh Shield LEVEL SWITCHES – SINGLE POINT Part No. 46999 Bottle Level For external mounting on tanks too small to accommodate internally mounted switches. (See note below) For detecting levels as low as 5/8˝ from tank bottom. Use in water, some oils and chemicals. Cut-away version shown Compact, all-polypropylene switch with slosh shield is ideal for use with turbulent liquids in small tanks. FDA compliant materials. Order By Part Number All Polysulfone...

FLOAT TYPE LS-7 with 5 Amp Relay O-Ring Sealed, Water Resistant J-Box LEVEL SWITCHES – SINGLE POINT An SPDT relay enables this LS-7 to control two independent loads up to 5 amps each. Switching N.O. for one load and N.C. for the other. This unit is designed to operate with a load connected to each of the two outputs. These loads must be 10 watts, minimum, for correct SPDT switching. One load used alone must be connected to the N.O. terminal. With this load, which may be less than 10 watts, the unit will operate the same as an SPST unit. Specifications Wetted Materials Min. Liquid Specific Gravity...

Small Size – Engineered Plastics LS-7 Series–Compact Side Mounts are the Solution to Many Small Tanks These low-cost units are ideal for high volume use in small tanks and vessels. Engineered plastics construction offers broad compatibility in water, oils and chemicals. LEVEL SWITCHES – SINGLE POINT Type 3 Internal Mounting Type 5 External Mounting Polypropylene, Nylon or Versaplast™. Polypropylene, Nylon or Versaplast™. ZIP CORD LEADWIRES, 24˝ EXTENDED Polypropylene or Nylon; conduit connection. ZIP CORD STYLE 24˝ LEADWIRES GASKET (WHITE BUNA N INCLUDED) Type 7 External Mounting LEAD WIRES,...

FLOAT TYPE Nylon is ideal for oils and fuels. NSF Standard 169 polypropylene is ideal for potable water and broad chemicals. Type 10 External Mounting Type 12 Internal Mounting Externally mounts through and seals non-threaded holes using a HNBR compression gasket. 4.093˝ (104 mm) ZIP CORD LEADWIRES 24˝ EXTENDED ZIP CORD LEAD WIRES 24˝ - 26˝ EXTENDED Type 13 Internal Mounting Side mount “Drop Down” design for calcifying hot water applications. NSF compliant Noryl®. GASKET, HNBR (FDA Compliant) LEVEL SWITCHES – SINGLE POINT Versaplast™ is ideal for corrosive fluids, hot water, antifreeze, chemicals...

Small Size - Alloys LS-7 Series - Compact Alloy and Alloy/Plastics Side Mounts LEVEL SWITCHES – SINGLE POINT Built for durability, our LS-7 Series switches utilize stainless steel, or zinc bodies. Ideal for any small tank or vessel destined for a rugged environment. All-stainless steel material of construction of Types 9 and 11 is generally recognized as safe with FDA for food contact regulations. Type 6 – External Mounting Type 8 – External Mounting Zinc alloy body with polypropylene or nylon float. SAE Mounting. Zinc alloy body with nylon or polypropylene float. Type 9 – External Mounting Type...