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WSP-4 Vibrating Level Switches
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Application:
WSP-4 Vibrating Level Switches are designed for reliable signalling of liquid limit levels in various conditions: in pressurized or open tanks. They can also indicate flow or the presence of liquid in pipelines.
Construction and Operating Principle:
WSP-4 sensors are designed as a tuning fork (two vibrating forks mounted on a diaphragm). A piezoceramic resonator is attached internally, which excites the rod to vibrate at its natural resonant frequency.
When the liquid touches the forks, the vibration stops or its amplitude significantly decreases. The electronics, housed in the sensor body, detect this damping to determine the presence of the liquid.
The connection of the diaphragm to the base can be direct or indirect (using an extension tube).
Materials and Corrosion Resistance:
The parts of the sensor that contact the medium are made of acid-resistant steel grade PN-EN 1.4404 (AISI 316L).
For use in corrosive environments (chemical, food, or pharmaceutical industries), elements are available with a protective coating of PVDF, EDF, PFA, or PTFE. The housing is made of 316L steel and polyester.
WSP-4 point level sensors for liquids are available in the following versions for diverse applications:
| Version | Description | Length (L) | Operating Temperature |
| WSP-4A | Short (compact), e.g., for pipelines | 63 mm | -40...+100°C |
| WSP-4B | Extended | 63 mm ÷ 300 mm | -40...+100°C |
| WSP-4C | High-temperature (with thermal barrier/distance) | 63 mm ÷ 300 mm | -40...+150°C |
| WSP-4E | Extended, with forks on a rope/cable | up to 7 m | -40...+100°C |
| WSP-4H | Hygienic | 63 mm ÷ 300 mm | -40...+100°C |
| WSP-4Y | Special version upon customer request |
All WSP-4 variants feature vibrating forks 38 mm long and 13 mm wide.
| Parameter | Value |
| Manufacturer | Poland |
| Country of Origin | Poland |
| Measured Variable | Point Level |
| Measurement Principle | Vibrating (Tuning Fork) |
| Measuring Media | Liquids |
| Operating Pressure | 4 MPa (40 bar) |
| Ambient Temperature Range | -40...+70°C |
| Output Signal Settling Time | 500 ms |
| Base Material (Wetted) | 316L Steel |
| Housing Material (Electronics) | 316L Steel + Polyester |
| Protection Degree | IP67 |
| Process Connection | G, R, NPT: (1/2”, ¾”, 1”) or M20x1.5 |
| Electrical Connection | M12 or ISO4400 or cable gland |
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WSP-4 Vibrating Level Switches
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