Description
The LS-11-040 Stainless Steel Single-Level Float Switch is a robust, high-performance liquid level sensor built for use in high-temperature, high-pressure, and chemically aggressive environments. Constructed entirely from durable 316 stainless steel, this vertically mounted float switch is engineered for reliable level control in industrial applications such as chemical processing, hydraulic systems, oil and fuel tanks, and water treatment facilities.
With its ability to withstand pressures up to 300 PSI and operate in temperatures ranging from -40°F to 300°F, the LS-11-040 is ideal for use in extreme operating conditions where traditional float materials might fail. The rugged stainless steel construction resists corrosion, mechanical wear, and chemical degradation, ensuring a long service life in both clean and harsh fluids.
This model features a compact design with a threaded mounting stem and a specific gravity activation point of 0.72, allowing it to function reliably in water, oils, and various industrial liquids. The float switch is equipped with a 3 VA SPDT reed switch, supporting up to 100 VAC or VDC with a maximum switching current of 0.25A, making it well-suited for signaling, alarm systems, or basic control functions in automation panels or remote monitoring setups.
The LS-11-040 comes with 24-inch long, 20 AWG lead wires insulated in PVC, offering robust electrical connectivity that resists heat and environmental stress. The unit is shipped in a Normally Open (N.O.) configuration by default, but the float can easily be inverted on the stem to switch the behavior to Normally Closed (N.C.), offering installation flexibility for a variety of system requirements.
UL Recognized under File# E177423, this float switch meets rigorous industry standards for performance and safety. Its straightforward design allows quick and easy integration into new systems or retrofitting into existing tanks or process lines.
Whether you’re managing fluids in an industrial plant, monitoring reservoir levels, or controlling pumps and valves in automated systems, the LS-11-040 provides consistent and dependable performance. It is a proven solution for professionals looking for compact design, rugged durability, chemical resistance, and reliable level sensing in harsh environments.
| Part # | Reed Switch | Dry State | Price |
| LS-11-041/2 | 70 VA SPST | N.O.* | $42.25 |
| LS-11-043/4 | 100 VA SPST | N.O.* | $46.65 |
| LS-11-045 | 3 VA SPDT | N.O. / N.C. | $47.75 |
* The dry state can be changed from Normally Open to Normally Closed by inverting the float.
Dry State: The condition of the reed switch when the tank is dry.
N.O.: Normally Open
N.C.: Normally Closed
SPST: Single Pole Single Throw
SPDT: Single Pole Double Throw
| Operating Temp | Maximum Pressure | Float Spec. Gravity |
| -40°F to 300°F | 300 PSI | .72 |
| Thread | Float | Lead Wires |
| 1/8″ npt | 1.08″ diameter | 20 AWG PVC 24″ |
