Description
The LS-31-030 Stainless Steel Single-Level Float Switch is a heavy-duty, high-performance liquid level sensor designed for demanding industrial applications. Built with precision using 316 stainless steel, this model is optimized for high temperature, high pressure, and chemically aggressive environments, offering excellent resistance to corrosion, heat, and mechanical stress.
Its robust construction allows the LS-31-030 to function reliably in systems that handle water, oils, fuels, solvents, and harsh chemicals. With a maximum pressure rating of 750 PSI and a broad temperature operating range from -40°F to 300°F, this float switch performs exceptionally well in extreme conditions, making it ideal for use in power plants, refineries, process industries, and OEM systems.
Equipped with a SPST reed switch rated at 100 VA, the LS-31-030 is capable of switching up to 300 VAC or 350 VDC, with a maximum switching current of 2.5A DC / 1.0A AC, allowing it to control pumps, alarms, indicators, and other electrical systems with ease. It features a specific gravity activation of 0.64, ensuring accurate float response even in lighter fluids.
The float switch uses a vertical mount with a standard 1/8″ NPT fitting, making installation straightforward in tanks, pipes, or vessels. It comes pre-wired with 24-inch, 20 AWG PVC-insulated leads for quick integration into control panels or automation circuits, ensuring durability and ease of connection even in rugged or wet environments.
Like other models in the series, the LS-31-030 float orientation can be easily inverted to switch between Normally Open (N.O.) and Normally Closed (N.C.) configurations, allowing the same unit to be used in multiple control logic scenarios without the need for additional components.
Its rugged construction, superior pressure tolerance, and electrical reliability make it a go-to choice for engineers and operators who need a dependable float switch in mission-critical systems. It is also UL Recognized (File# E177423), ensuring safety and performance compliance with industry standards.
For applications that demand a robust, high-pressure, high-accuracy stainless steel float switch, the LS-31-030 is engineered to deliver exceptional performance, longevity, and value in even the harshest operating environments
| Part # | Reed Switch | Dry State | Price |
| LS-31-031/2 | 70 VA SPST | N.O.* | $60.70 |
| LS-31-033/4 | 100 VA SPST | N.O.* | $65.10 |
| LS-31-035 | 3 VA SPDT | N.O. / N.C. | $66.20 |
| LS-31-036 | 25 VA SPDT | N.O. / N.C. | $67.30 |
| LS-31-037 | 100 VA SPDT | N.O. / N.C. | $68.40 |
* 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 | 750 PSI | .64 |
| Thread | Float | Lead Wires |
| 1/4″ npt | 2.0″ diameter | 20 AWG PVC 24″ |
