✅ This item is normally regularly stocked. Shipping times may vary depending on availability. Please contact us to confirm stock and shipping times. You will receive tracking details once the item has shipped.
Description
Mechanically Activated Narrow-Angle Float Switch for Precise Liquid Level Control in Sewage, Water, and Pump Panel Applications
When a pump control panel needs a precise on/off signal from tight water-level changes, the SJE SignalMaster narrow-angle float switch handles it. The mechanically activated 1.5" control differential delivers reliable snap-action switching for high-level alarms, low-level shutdown, and pump start/stop in sewage and water applications.
Quick Specs
- Type: Mechanically activated narrow-angle control switch
- Configurations: Normally Open (yellow cap) or Normally Closed (white cap)
- Cable Lengths Available: 10 ft and 20 ft (18 AWG, 2-conductor SJOW)
- Control Differential: 1.5" above or below the horizontal
- Electrical: 5 amps at 125/250 VAC, 50/60 Hz
- Float Material: High-impact polypropylene (corrosion-resistant)
- Float Size: 2.74" diameter x 4.83" length
- Certification: UL Listed (water and sewage), CSA Certified
- Warranty: 5-Year Limited
Key Features of the SJE SignalMaster Narrow-Angle Float Switch
- Mechanically activated snap-action contacts deliver consistent, repeatable switching without mercury, meeting jurisdictions that restrict mercury float switches.
- The narrow 1.5" control differential provides precise liquid level control in confined sumps, basins, and lift stations where wide-angle float switches overshoot.
- Color-coded caps for fast identification on multi-float installs: yellow = normally open (high level), white = normally closed (low level).
- Rotation-insensitive design means the float operates correctly regardless of how it spins on its tether, resulting in fewer service calls from twisted cables.
- High-impact polypropylene housing resists corrosion in raw sewage, effluent, and non-potable water at temperatures up to 140°F.
- Submersible to 30 feet (9 m) at 13 PSI for deep-well and lift-station service.
- Compatible with simplex and duplex pump control panels (including the SJE NEX Series simplex panel), and with high-water alarm systems requiring a dry-contact input.
- Includes mounting clamp for pipe-mount installs; externally weighted variants available for suspended applications (sold separately).
Specifications
| Specification | Details |
|---|---|
| Brand | SJE Rhombus |
| Series | SignalMaster® |
| Switch Type | Mechanically activated, snap-action contacts |
| Configuration | Normally Open (high level, pump-down) yellow cap; Normally Closed (low level, pump-up) white cap |
| Control Differential | 1.5 inches (4 cm) above or below the horizontal |
| Electrical Rating | 5 amps at 125/250 VAC, 50/60 Hz |
| Cable | 18 AWG, 2-conductor SJOW (UL, CSA), water-resistant CPE jacket |
| Cable Lengths Available | 10 ft and 20 ft (manufacturer also offers 15 ft and 30 ft) |
| Float Housing | High-impact polypropylene, corrosion-resistant |
| Float Dimensions | 2.74" diameter x 4.83" length (7.0 x 12.3 cm) |
| Maximum Liquid Temperature | 140°F (60°C) |
| Maximum Depth | 30 ft (9 m), 13 PSI (90 kPa) — IPX8 |
| Mounting Method | Mounting clamp included (pipe-mount); externally weighted variant available separately |
| Rotation Sensitivity | Not sensitive to rotation |
| Approved Media | Sewage, wastewater, and non-potable water |
| Not Recommended For | Electrical loads under 100 mA, 12 VAC, or non-arcing electrical loads |
| Certification | UL Listed for water and sewage; CSA Certified |
| Installation Standard | Installs per NEC / ANSI/NFPA 70 — qualified electrician required |
Performance Overview
In a normally open install, the float closes the circuit when it tips above horizontal, and the pump turns on at high level. Normally closed reverses that for pump-up or low-level shutdown.
Construction & Materials
| Component | Details |
|---|---|
| Float Housing | High-impact polypropylene, sealed against sewage and wastewater ingress |
| Switch Mechanism | Mechanically activated micro-switch, no mercury, no glass tubes |
| Cable Jacket | SJOW water-resistant CPE for outdoor and submerged service |
| Cable Conductors | 18 AWG, 2-conductor (UL, CSA listed) |
| Color Cap | Yellow (NO) or White (NC) molded into housing for permanent identification |
| Mounting Hardware | 18-8 stainless steel hose clamp included with pipe-clamp variants |
| Ingress Protection | IPX8 to 10 m water depth |
| Suitable Installation | Category II, rated to 60°C, double-insulated |
Applications
- Sewage and wastewater systems pump-down control on residential and light-commercial lift stations
- Simplex and duplex pump control panels (factory-paired with the SJE NEX Series simplex panel as stop, start, and alarm floats)
- High-level alarm float for tank alarm systems and overflow protection
- Low-level shutdown protection for pumps to prevent dry-running and motor damage
- Lift stations, dose tanks, and effluent basins where precise on/off control matters
- Replacement float for existing SJE installs and competitor narrow-angle controls
Why Choose the SJE SignalMaster Narrow-Angle Float Switch?
The SignalMaster is the float SJE Rhombus, which pairs with its own NEX Series simplex and duplex panels. Installers ordering replacement floats for SJE-equipped lift stations get a known-good fit. The 1.5" differential, snap-action mechanical switching, and rotation-insensitive design hold up in real wastewater service.
Buy SJE SignalMaster Narrow-Angle Float Switches Online from Cleanflow
Cleanflow stocks SignalMaster as a recognized SJE Rhombus distributor and ships across Canada and the USA. Add to cart, or contact the Cleanflow team to confirm cable length and float configuration for your install.
For multi-float installs running stop, start, and alarm sequences, pair this float with the SJE stainless steel four-float bracket to keep cables organized and floats properly spaced.
What is a narrow-angle float switch?
A float switch that activates with minimal movement, about 1.5 inches above or below horizontal, instead of the larger swing required by wide-angle floats. Narrow-angle floats are used as control switches in tight basins or where precise on/off levels matter.
What's the difference between normally open and normally closed?
Normally Open (NO, yellow cap): the switch closes when the float tips above horizontal, used for high-level alarms and pump-down control. Normally Closed (NC, white cap): the switch closes when the float drops below horizontal, used for low-level shutdown or pump-up filling.
Which cable length should I order — 10 ft or 20 ft?
Match cable length to the distance between the float position in the basin and the pump control panel or junction box, with a few feet of slack. 10 ft suits short residential runs; 20 ft covers most lift-station and septic tank installs. Splicing inside a sealed junction box is acceptable per the installation manual.
Is this switch suitable for sewage applications?
Yes. The polypropylene housing and SJOW cable are rated for sewage and non-potable water up to 140°F (60°C), submersible to 30 ft. UL Listed for water and sewage, CSA Certified.
Does it work with my SJE NEX Series simplex pump control panel?
Yes, SJE SignalMaster is the standard control switch SJE Rhombus pairs with its NEX Series panels. Three SignalMaster floats wire to the panel as stop, start, and alarm. Cleanflow also stocks the NEX panel package with floats included, if you need both.
Can it control low-voltage circuits?
No. The switch is not recommended for electrical loads under 100 milliamps, 12 VAC, or non-arcing loads. For low-current AC/DC potable water control, look at the SJE MilliAmpMaster WPS.
Can the float be suspended from above instead of being pipe-mounted?
The SKU listed here includes a stainless steel mounting clamp for pipe-mount installs. SJE also offers an externally weighted variant (SGMWENO / SGMWENC) for suspended applications. Contact Cleanflow if you need that configuration. For suspended installs without pipe-mount access, use an adjustable float switch cable weight to create a precise pivot point and set the switch activation level.
What is the warranty?
SJE Rhombus backs the SignalMaster with a 5-Year Limited Warranty. Installation must follow the SJE installation instructions and applicable electrical codes (NEC / ANSI NFPA-70, plus provincial and local) by a licensed electrician.
Manuals & Documentation
✅ This item is normally regularly stocked. Shipping times may vary depending on availability. Please contact us to confirm stock and shipping times. You will receive tracking details once the item has shipped.
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