In the water treatment industry, level monitoring is critical for ensuring stable processes, equipment safety, and operational efficiency. Choosing the right level sensor enhances system reliability and reduces maintenance costs. This guide explores water treatment level sensor selection criteria to help you identify solutions tailored to diverse scenarios.
Why Does Level Sensor Selection Matter in Water Treatment?
Accurate level measurement directly impacts:
Water Safety: Prevents overflow or dry-running damage
Energy Efficiency: Optimizes pump cycling to cut power consumption
Compliance: Meets environmental regulations (e.g., wastewater discharge limits)
Cost Control: Avoids chemical dosing errors due to inaccurate readings
Level sensors selection scheme: technology comparison and applicable scenarios
| Type | Principle | Accuracy | Advantages | Disadvantages | Applications |
| Ultrasonic level sensor | Sound wave reflection distance measurement | ±0.5% | Non-contact, corrosion-resistant, easy to install | Blind spot exists, affected by foam and temperature | Medicine tank, mud discharge tank |
| Radar level sensor | Electromagnetic wave reflection distance measurement | ±1mm | Strong anti-interference, suitable for harsh environment | High budgetary | Sewage pool containing foam and steam |
| Hydrostatic Level Sensor | Measurement of liquid column static pressure | ±0.1%~±0.5% | Simple structure, low cost | Easily affected by water quality, requires regular maintenance | Clear water tank, filter tank |
| Capacitive level sensor | Electrode capacitance change | ±0.2%~±1.0% | Fast response, no mechanical parts | Error caused by unstable dielectric constant | Regulating tank, clear water tank |
Core recommendations for selection
1. Select according to the characteristics of the medium
· Wastewater containing impurities: non-contact radar level gauge or non invasive ultrasonic level meter is preferred to avoid clogging problems.
·Corrosive liquid: select a capacitive level gauge with titanium alloy electrodes or polyethylene insulation layer to enhance corrosion resistance.
·High temperature and high pressure environment: use radar level gauge (temperature resistance up to 200℃) or static pressure level gauge (with isolation tube installed).
2. Match control requirements
·Simple threshold control: Float level switch is used for high and low level alarms, and linkage pump valve start and stop.
·Continuous and precise control: Radar level gauge + PLC system realizes closed-loop adjustment with an error of less than 1mm.
3. Economic efficiency and maintenance cost
·Limited budget: static pressure 4-20ma immersion level transmitter for wastewater (low price, but requires regular cleaning) or magnetic flap level gauge (simple maintenance).
·Long-term stability: radar level gauge (no mechanical wear, life of more than 5 years).
Industry application cases
Case: A sewage treatment plant
Using Pokcenser’s radar level sensor for sewage instead of traditional float type, annual maintenance cost is reduced by 60%, and blind spot problem is solved by adjusting the installation height.
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