SJE SignalMaster® Narrow-Angle Float Switch – Mechanically Activated Pump Control Switch, Normally Open/Closed Options

Reliable Narrow-Angle Float Switch for Precise Liquid Level Control

The SJE SignalMaster® Narrow-Angle Control Switch is a mechanically-activated float switch designed for accurate liquid level monitoring in water and sewage systems. Ideal for use with pump control panels and alarm systems, this switch delivers precise activation with minimal movement, making it perfect for confined or tight basin applications.

With a tight 1.5" control differential, the SignalMaster® provides dependable on/off control for both high-level (normally open) and low-level (normally closed) applications. Its rugged polypropylene float housing is built to withstand harsh wastewater environments while maintaining long-term reliability.

Key Features

• Narrow-angle float switch for precise level control
• Mechanically activated snap-action contacts for reliability
• 1.5" control differential for tight activation range
• Normally Open (high level) and Normally Closed (low level) options
• Color-coded caps for quick identification (Yellow = NO, White = NC)
• Rotation-insensitive design for consistent operation
• Durable polypropylene float housing for corrosion resistance
• Includes mounting clamp for easy installation
• Compatible with pump panels and alarm systems
• UL Listed and CSA Certified
• 5-Year Limited Warranty

How It Works

• Normally Open (High Level – Yellow Cap):
  Activates when liquid level rises above horizontal and deactivates when it falls.
• Normally Closed (Low Level – White Cap):
  Activates when liquid level drops below horizontal and deactivates when it rises.

Specifications

Available Options

• Normally Open (High Level) or Normally Closed (Low Level)
• Cable lengths: 10', and 20' 

Typical Applications

• Sewage and wastewater systems
• Pump control panels (simplex and duplex)
• High-level alarms
• Low-level shutdown protection
• Lift stations and basins

Frequently Asked Questions (FAQs)

What is a narrow-angle float switch?

It’s a float that activates with minimal movement, ideal for tight spaces where wide-angle floats won’t work.

What’s the difference between normally open and normally closed?

• Normally Open (NO): Activates on rising water (high level)
• Normally Closed (NC): Activates on falling water (low level)

How much movement does it require to activate?

Only about 1.5 inches above or below horizontal, making it very precise.

Is this suitable for sewage applications?

Yes. It’s designed for wastewater, sewage, and water systems.

Does it come with mounting hardware?

Yes. A mounting clamp is included for easy installation.

Can it be suspended instead of mounted?

Yes, but external weights (sold separately) are required.

What is the maximum depth rating?

Up to 30 feet of submersion.

Can this control low-voltage systems?

No. It is not recommended for loads under 100 mA or low-voltage non-arcing circuits.