FLYGT Float Switch – Reliable Liquid Level Control for Submersible Pumps
About Dongguan HydroBlue Co., Ltd.
Dongguan HydroBlue Co., Ltd. supplies replacement float switches engineered to match original FLYGT specifications for submersible sewage pumps and wastewater lifting stations. Our team of eight engineers combines expertise in electrical engineering, pump control systems, and wet-well equipment design, with research partnerships at Jiangsu University, Chinese Academy of Sciences, and Guangdong University of Technology. In addition to float switches, we provide a complete range of pump spares, variable-frequency drive cabinets, motor control enclosures, mechanical seal assemblies, and overseas field engineering support including 3D scanning of worn pump components.
Contact us with your pump model and cable requirements for a compatibility check and quotation.
How It Works
The FLYGT float switch is a sealed tilt switch inside a buoyant housing. As the liquid level rises, the float tilts and the internal switch changes state, sending a signal to the pump control panel. The start and stop levels are determined by the float's position along the cable and the use of a supplementary counterweight. Typical switching differential: 300–500 mm with standard cable.
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Float Position
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Switch State (NO Configuration)
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Pump Action
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Vertical (low level, default)
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Open
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Pump off
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Tilted ~45° (actuation point)
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Transition
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Start or stop signal sent
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Horizontal/inverted (high level)
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Closed
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Pump on
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Technical Specifications
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Specification
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Details
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Switch Type
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Mercury-free micro-switch (SPST or DPDT)
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Rated Voltage
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250V AC / 24V DC
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Rated Current
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10A resistive / 3A inductive (AC), 1-2A (DC)
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Standard Cable
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H07RN-F neoprene rubber; 3m, 5m, 10m, or custom length
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Upgrade Cable Options
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PUR sheathed (abrasion-resistant), PVC (chemical-duty), FEP/PTFE (high-temp/aggressive chemicals)
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Float Housing
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PP or PE; cable entry hermetically sealed
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Switching Differential
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300–500 mm (adjustable with counterweight)
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Quality Testing
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Continuity, insulation resistance, hi-pot, functional simulation — 100% batch tested
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Mounting Configurations
- Two-float system (start + stop) — Independent float switches for start and stop levels. Simple, reliable, each float operates independently
- Single float with counterweight — One float suspended from an anchor point; a cable weight creates the differential. Single cable entry, differential adjustable by moving the weight
- Three-float system (start + stop + alarm) — Adds a high-level alarm float for overflow warning. Complies with environmental regulations for sewage stations
Troubleshooting Common Issues
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Symptom
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Likely Cause
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Action
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Pump won’t start at high level
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Float obstructed, waterlogged, or cable broken
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Remove obstruction. Test continuity. Replace if waterlogged
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Pump runs continuously
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Stop float stuck in ON position; cable tangled; counterweight displaced
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Test each float individually. Re-secure cable and weight
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Short cycling (< 2 min)
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Floats too close; counterweight too near the float
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Increase separation to ≥ 300 mm. Reposition weight
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Contactorer chattering
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Float contacts arcing; voltage drop in long cable
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Install interposing relay. Check cable conductor size
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How to Order
- Count the number of floats and cable length required
- Confirm switch logic (NO or NC float for your control panel)
- Choose cable type — standard neoprene for general sewage, PUR for abrasive environments, PVC for chemical duty, FEP/PTFE for aggressive chemicals
- If the previous float failed due to cable chafing, waterlogging, or chemical attack, note the failure mode so we can recommend the appropriate upgrade
- Submit enquiry — standard floats ship within 5–10 business days; custom specifications 15–25 days
Frequently Asked Questions
Q1: Can a waterlogged float be repaired?
No. Waterlogging means the cable-to-housing seal has failed — there is no reliable repair. Replace the float switch. To prevent recurrence, ensure the cable is not under tension at the entry point and inspect the seal condition every 2–3 years.
Q2: What cable type should I choose for abrasive sewage?
PUR-sheathed cable offers the best abrasion resistance. Standard H07RN-F neoprene is suitable for general municipal sewage but will chafe faster if in contact with sharp-edged debris or rough wet-well surfaces.
Q3: How do I test a float switch without entering the wet well?
Disconnect the wires at the control panel. Connect a multimeter across the switch conductors. Lift the float by its cable (via a hook or access hatch) until it tilts. A click and continuity change confirms the switch is working.
Q4: What is the difference between your float switch and a generic one?
Our FLYGT float switch reproduces the OEM mounting dimensions, cable entry thread, float body profile, and connector type. Generic floats may have different fitting dimensions, causing installation issues even if the electrical ratings match.
Q5: What is the warranty?
12 months from commissioning or 18 months from dispatch. Covers contact failure, seal failure causing water ingress, and conductor breakage. Chafing and chemical damage are application-dependent.
