Point detection
Detects whether material covers a fixed position. Suitable for high level, low level and empty-pipe indication.
LISEN · BAUMER
Compare Level Sensor Technologies
Start with the control task. A point level switch can replace another switching device when the process, installation and output are compatible; it cannot directly replace a continuous transmitter.
Continuous measurement
Measures changing level or distance. Keep radar, ultrasonic or pressure measurement when you need a continuous value.
| Technology | Useful for | Check before replacing |
|---|---|---|
| Frequency sweep / electronic point switch | Compact point detection in compatible liquids, pastes and solids. | Validate coating, foam, dielectric response and model-specific limits. |
| Float switch | Simple point detection in liquids with sufficient buoyancy. | Review density, moving parts, deposits and mounting space. |
| Vibrating fork | Liquid point detection with a proven vibrating element. | Compare density, viscosity, buildup and required approvals. |
| Capacitive / conductive switch | Point detection based on electrical properties of the medium. | Check conductivity or dielectric behavior, grounding and residue. |
| Optical switch | Compact liquid presence detection at an optical tip. | Evaluate fouling, bubbles, opacity and cleaning access. |
| Radar / ultrasonic / hydrostatic transmitter | Continuous level, inventory or distance measurement. | Retain continuous measurement; add a separate point switch if needed. |
Point detection
A switch responds at its installed position
Move the liquid level to see the difference between a fixed switching point and a continuously changing level. This is a principle illustration, not a response-time test.
Sensor covered
Technology comparison
Why consider an electronic point level switch?
A compact sensing tip and no moving float can simplify installation. Performance still depends on the medium, mounting position and settings.
Less intrusion into the process
A short sensing tip suits compact vessels and pipes. Check insertion depth, nozzle geometry and cleaning access.
Match the signal to the medium
Evaluate product, foam and residue separately. Difficult media may need a sample test and adjusted switching thresholds.
Build the complete sensor package
Confirm the sensor, mounting adapter, seal, cable and PLC input together. A matching thread alone does not ensure interchangeability.