FM Series Multi-Level Float Switches
Quick Overview
The FM Series multi-level float switch delivers 2, 3, or 4 independent switch points in a single stem-and-cable assembly — eliminating the cost and complexity of installing multiple single-point sensors. Each switch point uses a buoyant float with an internal permanent magnet to actuate a hermetically sealed reed switch at its configured level. All switch points exit on a single cable. Stem length and switch point spacing are fully configurable to your tank geometry and control logic — specify your required levels at time of order. Available in stainless steel and engineering plastics for virtually any fluid environment.
Specifications
| Orientation | Vertical, multi-point |
| Technology | Multiple reed switches on single stem |
| Switch Points | 2, 3, or 4 configurable switch points |
| Point Spacing | Configurable — custom to application |
| Housing Materials | Stainless steel (303/304/316L), polypropylene, PVDF, Kynar, Nylon |
| Switch Type | SPST (NO or NC) per point |
| Cable | Single cable assembly — all switch points |
| Mounting | NPT or BSP threaded; custom available |
| Certifications | ISO 9001 |
Key Features
2 to 4 Switch Points
Multiple float-actuated reed switches on a single stem — high-level alarm, low-level alarm, pump on, pump off in one assembly.
Single Cable Assembly
All switch points exit in a single cable — reduces wiring complexity and connector count compared to multiple single-point sensors.
Configurable Spacing
Switch point positions along the stem are configured to your set points — specify your required levels at time of order.
Magnetic Reed Technology
Each switch point is a hermetically sealed reed switch — no fluid contact with switch electronics, long operational life.
Wide Material Selection
Stainless steel (303, 304, 316L) and engineering plastics (PP, PVDF, Kynar, nylon) for chemical and temperature compatibility.
OEM Volume Pricing
Fully custom OEM designs at production quantities — stem length, float count, materials, cable, and connectors to your spec.
Related Products
Vertical Float Switches
Single-level top or bottom mount float switch, stainless and plastic.
View product FHHorizontal Float Switches
Side-mount for space-limited tank walls and confined vessels.
View product FL50Ultrasonic Level Sensor
Non-contact top-mount point level sensing. No moving parts.
View product OS2Optical Level Sensor
No moving parts, prism-based infrared level switch up to 250 PSIG.
View productReady to specify an FM Series multi-level switch?
Our engineering team can configure switch points, stem length, and materials to your exact requirements.