Pneumatic Level Switch
Non-electric point-level detection: an air signal that trips alarms, valves and pumps at the set level — no spark risk, no power required at the measuring point.
Technical Data
| Principle | Float / displacer pilot or dip-tube back-pressure |
|---|---|
| Process connection | Flanged, threaded or side — EN / ASME / DIN |
| Mounting | Top, side or immersed — tanks, separators, pits, sumps |
| Wetted materials | Stainless steel; special alloys or coatings for aggressive media |
| Output | Two-position (filling or discharge position) |
| Air supply | Clean, dry instrument air via filter-regulator (supply-air designs) |
| Power | None — no electrical circuit at the measuring point |
Datasheet & Drawings
GA, hook-up and wiring drawings are prepared per order — supplied with your quotation for approval.
EN 10204 3.1 material certificates are supplied with your shipment.
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Frequently Asked Questions
How is it different from an electrical level switch?
It does the same job — high/low alarm, cut-out, pump control — but switches a pneumatic signal instead of an electrical contact. That removes any ignition source at the measuring point and lets it work without mains power.
Why use one in a hazardous area?
It carries no voltage and makes no electrical contact at the process connection, so it introduces no spark risk into a flammable atmosphere.
Does it need an air supply?
Some designs run on a small supply of clean, dry, filtered instrument air through a filter-regulator; others simply switch the air path. The air requirement is confirmed for the design selected.
What can the output drive?
The two-state air signal can pilot an air-actuated control or shut-off valve, trip a pneumatic alarm, or feed a larger air relay controlling a pump or process.
Can it handle dirty or corrosive liquids?
Yes — a dip-tube design keeps the liquid off the switching element, and wetted parts can be stainless steel or special alloys.
Can it act on both high and low level?
Yes — multiple set points can be configured, for example a high-level shut-off plus a low-level cut-out from one installation.
Engineered to order. Delivered worldwide.
Send your duty conditions — size, pressure, temperature, medium and connections — and our engineers return a drawing, material selection and lead time.
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