06 Mar
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Level Switch Comparison
| Capacitive | Detects capacitance changes caused by liquid level variation | Non-conductive liquids (oil), solids | Medium-High | ✅Non-contact, corrosion-resistant ❌Requires calibration, sensitive to dielectric constant | Chemical storage tanks, oil monitoring | |
| Conductive | Triggers switch via liquid conductivity forming circuit | Conductive liquids (water, acids) | Low-Medium | ✅Simple structure, low cost ❌Contact required, probe corrosion risk | Water tank alarms, wastewater treatment | |
| Float (Buoyancy) | Mechanical/magnetic switch activated by buoyancy-driven float | General liquids (non-viscous) | Low | ✅No power needed (some models), easy installation ❌Jamming risk, unsuitable for viscous media | Household appliances, ship fuel tanks | |
| Tuning Fork | Detects vibration frequency shift caused by liquid damping | Liquids, powders | Medium | ✅Bubble/turbulence resistance, maintenance-free ❌Viscous media may cause false signals | Food processing tanks, pharmaceutical reactors | |
| Optical | Infrared refraction difference between liquid/air | Transparent liquids | High | ✅Micro-level detection, high temperature/pressure tolerance ❌Prism contamination risk 7 | Medical devices, coffee machines | |
| Ultrasonic | Calculates level via soundwave reflection time | Liquids, bulk solids (non-foaming) | High | ✅Non-contact, continuous measurement ❌Dead zones, temperature/turbulence interference | Large storage tanks, river monitoring | |
| RF-Admittance | Detects admittance changes from medium properties | High-viscosity, corrosive liquids | Medium | ✅Anti-coating, corrosion-resistant ❌Contact required, higher cost | Asphalt tanks, strong acid/base containers | |
| External Mount | Detects container wall vibration characteristics | Hazardous/sealed containers | Medium-High | ✅Non-invasive, no drilling needed ❌Dependent on container material uniformity | Nuclear containers, toxic chemical storage | |
| Radar | Analyzes microwave reflection signals | Complex liquids/solids | Very High | ✅Foam/dust resistance, long-range measurement ❌High cost, complex installation | Oil storage tanks, LNG terminals | |
Selection Guidelines
- Non-contact requirement: Capacitive, Ultrasonic, Radar, or External Mount .
- High-viscosity media: RF-Admittance or Tuning Fork (with periodic cleaning) .
- Low-cost scenarios: Float or Conductive types .
- Explosion-proof environments: Optical or Capacitive (spark-free) .
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