Product Description
Reliable SJE Rhombus Control Switch for Precise Liquid Level Control
SJE Rhombus MegaMaster® narrow-angle float switch is a mechanically activated control switch designed for accurate liquid level control in demanding environments. Commonly used as a lift station float switch, sewage float switch, or floating switch for water tanks, this unit delivers consistent performance where precise on/off control is critical.
Designed with an internal weight and narrow activation angle, this SJE Rhombus control switch delivers consistent, repeatable operation without the need for external weights. It performs reliably in municipal lift stations, wastewater systems, and industrial tanks where accurate level control is essential.
Key Features of the SJE Rhombus Narrow Angle Float Switch
Narrow-angle float switch design for precise liquid level control
SPDT float switch wiring (normally open or normally closed) for flexible installation
Internally weighted float – no external weights required
Gold cross-point contacts for reliable low-current switching (up to 1 amp)
High-visibility two-color housing to easily identify float position
Durable polypropylene construction for sewage and wastewater environments
Tear-drop float design improves buoyancy and stability
UL & CSA approved for safe and reliable operation
Non-mercury design for environmentally safe use
Made in the USA with proven field performance
5-year manufacturer warranty
How the SJE Rhombus Narrow Angle Float Switch Works
This SJE Rhombus narrow-angle float switch activates with a small change in liquid level, allowing for precise pump control in lift stations, sewage systems, and water tanks.
Normally Open (High-Level): The switch closes when the float tips slightly above horizontal, triggering the pump or alarm. It opens again as the float drops back down.
Normally Closed (Low-Level): The switch closes when the float tips slightly below horizontal, typically used for low-level or pump-down control. It opens as the float rises.
The internal weight keeps the switching action consistent, even in tight spaces or applications with grease, debris, or turbulent flow.
Technical Specifications
Specification
Details
Switch Type
SPDT (Single Pole Double Throw)
Wiring Configuration
White = Common, Black = Normally Open, Red = Normally Closed
Cable
18 AWG, 3-conductor SJOW, water-resistant (CPE)
Float Material
High-impact polypropylene
Float Dimensions
4.03" diameter × 6.62" length
Maximum Water Depth
30 ft (13 PSI)
Maximum Electrical Load
1 amp, 125 VAC
Minimum Electrical Load
1 mA, 4 VDC
Temperature Rating
Up to 140°F (60°C)
Certifications
UL & CSA approved
Common Applications
Lift station float switch systems (lead, lag, alarm, stop levels)
Sewage pump control systems
Wastewater treatment facilities
Water storage tanks and non-potable systems
Industrial liquid level control setups
Agricultural and construction dewatering systems
It is especially effective in systems with grease, debris, or fluctuating water levels, where consistent switching is critical.
Installation & Setup Tips
Maintain at least 12 inches of tether length for proper float movement
Ensure the float has clear space to operate freely (no walls, pipes, or pumps interfering)
Avoid placing the float in direct inflow or turbulent areas
Do not run float switch cables in the same conduit as power cables
Use a mounting bracket for structured multi-float systems (lead/lag/alarm setups)
Available Options
Cable lengths: 25 ft, 50 ft, 75 ft, 100 ft
Optional float mounting bracket is available for secure installation
Compatible Products & Accessories
Lift station pumps for complete wastewater systems
Float mounting brackets for multi-level control setups
Float switches for alarm, lag, and lead configurations
Pump lifting equipment for maintenance and installation
Why Buy This SJE Rhombus Control Switch from Cleanflow
Get reliable performance from the SJE Rhombus MegaMaster® narrow-angle float switch, designed for precise liquid level control in lift stations, sewage systems, and water tanks. As a trusted supplier of SJE Rhombus control switches, alarms, and float systems, Cleanflow provides proven solutions for municipal, industrial, and commercial applications.
Cleanflow ships across Canada and the USA, offering competitive pricing, fast shipping, and dependable product availability.
Browse our full range of SJE Rhombus Controls & Alarms, including float switches, tank alarms, and pump control solutions.
Frequently Asked Questions
What is a narrow-angle float switch used for?
A narrow-angle float switch is used for precise liquid level control, especially in lift stations, sewage systems, and tanks, where small level changes need accurate switching.
Can this be used as a lift station float switch?
Yes, this float switch is specifically designed for lift stations and is commonly used for pump control, alarm, and multi-float sequencing systems.
What does SPDT mean on this float switch?
SPDT (Single Pole Double Throw) means the switch can be wired as either normally open or normally closed, depending on your application.
Is this suitable for sewage systems?
Yes, this sewage float switch is built to handle harsh wastewater environments, including grease, debris, and fluctuating liquid levels.
Can this be used as a floating switch for a water tank?
Yes, it works effectively as a floating switch for water tanks, especially in non-potable or industrial applications.
Does this float switch require an external weight?
No, it is internally weighted, which simplifies installation and ensures consistent operation.
How do I choose the right cable length?
Select a cable length based on the depth of your tank or pit. Deeper lift stations typically require longer cables (50–100 ft).
Can this float switch be used in intrinsically safe or PLC-controlled systems?
Yes, the SJE Rhombus MegaMaster control switch is suitable for use in PLC (programmable logic controller) systems and intrinsically safe applications when installed according to applicable electrical codes. It is commonly used in municipal wastewater systems where low-current control signals are required.
Does this float switch require a specific mounting method or tether length?
Yes, proper installation is important for accurate operation. The float should be installed with a minimum tether length of 12 inches (30.5 cm) and must have enough clearance to move freely without contacting tank walls, pumps, or pipes. Avoid placing the float in turbulent or direct inflow areas to maintain consistent performance.
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