WIKA Model BNA Bypass level indicator With magnetic display
Original price was: $1,500.00.$1,300.00Current price is: $1,300.00.
The BNA magnetic level gauge uses a bypass chamber (flanged, threaded, or welded) connected to a vessel, matching its liquid level. A magnetic float inside the chamber transmits the level contact-free to an external display with 10mm-spaced two-color rollers or steel flaps. The float’s magnetic field flips the display elements (white↔red) through the chamber wall, showing level changes without power.
Applications of the magnetic level gauge
- Continuous level indication without power supply
- Indication of the level proportional to height
- Individual design and corrosion resistant materials make the products suitable for a broad range of applications
- Chemical, petrochemical industry, oil and natural gas extraction (on- and offshore), shipbuilding, machine building, power generating equipment, power plants
- Process water and drinking water treatment, food industry, pharmaceutical industry
Special features of the magnetic level gauge
- Process- and system-specific production
- Operating limits:
- Operating temperature: T = -196 … +450 °C
- Operating pressure: P = vacuum to 400 bar
- Limit density: ρ ≥ 340 kg/m3
- Wide variety of different process connections and materials
- Mounting of level transmitters and magnetic switches possible as an option
- Explosion-protected versions
Description of the magnetic level gauge
The magnetic level gauge model BNA consists of a bypass chamber, which, as a communicating tube, is connected laterally to a vessel via at least 2 process connections (flanged, threaded or welded). Through this type of arrangement of the magnetic level gauge, the level in the bypass chamber corresponds to the level in the vessel. The float with a built-in permanent magnetic system, which is mounted within the bypass chamber, transmits the liquid level, contact-free, to the magnetic display mounted to the outside of the bypass chamber. In this are fitted, at 10 mm intervals, two-coloured plastic rollers or stainless steel flaps with bar magnets.
Through the magnetic field of the permanent magnetic system in the float of the magnetic level gauge, the display elements, through the wall of the bypass chamber, are turned through 180°. For an increasing level from white to red; for a falling level from red to white. Thus the magnetic level gauge clearly displays the level of a vessel without power supply.
Design and operating principle
■ In a communicating bypass chamber mounted to the side
of a vessel a float moves with the level of the medium to be measured.
■ The magnetic field of the radial-symmetric magnetic system positioned in the float activates the magnetic display attached to the outside of the bypass cha.
Magnetic system
The magnetic system is assembled from a pole disc and various magnets. These can be individually adapted to the different chamber dimensions and for temperatures up to 450 °C.
| model | BNA-S |
|---|---|
| Bypass chamber | Ø 60.3 x 2 mm, max. 63 bar |
| Chamber end top | Pipe cap or flange connection |
| Chamber end bottom | Flange connection |
| Process connections | Mounting flange: |
| Centre-to-centre distance | Min. 150 mm to max. 6,000 mm |
| Material | ■ Stainless steel 1.4571 (316Ti) |
| Max. nominal pressure | 100 bar |
| Temperature range | -196 … +450 °C-196 … +450 °C |
| Float | ■ Cylindrical float |
| Magnetic display | Standard version: < 200 °C |
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