Flap-11S magnetic level indicator is designed for reliable local liquid level indication in industrial applications that need practical performance and cost control. It is made of 304 stainless steel and is suitable for mildly corrosive liquids. Because of its economical design and dependable structure, it is a good choice for general process tanks and utility systems.
The indicator works on the principle of communicating vessels and magnetic coupling. The chamber mounts beside the vessel and connects directly to the process liquid. Inside the chamber, a magnetic float moves up and down with the liquid level. As the float moves, it drives the nearby bi-color magnetic flaps in the visual indicator. The flaps turn from white to red or from red to white, which gives a clear local view of the actual liquid level in the vessel.
Clear Visual Display with Durable Chamber Design
The Flap-11S magnetic level indicator uses a 51 mm diameter chamber made from high-quality 304 seamless stainless-steel tube. This structure helps reduce problems often seen in conventional tubing, such as leakage, weak pressure resistance, poor appearance, and short service life. As a result, the instrument offers stronger reliability in everyday industrial use.
The visual indicator uses a broader display area and larger magnetic flaps. This improves both viewing angle and visible distance. The larger scale and numerals also make the level easier to read from far away, even at distances of up to 60 meters. Therefore, the indicator works well in process areas where local visibility is important.
Practical Structure for Industrial Monitoring
The instrument is available with IP65 or IP66/67 protection, depending on application needs. This helps improve reliability in outdoor and demanding industrial environments. In addition, compatible accessories such as magnetic switches, compact magnetic switches, and remote transmitters are available for users who need alarm, switching, or signal transmission functions.
These accessories can support SIL2 / SIL3 functional safety requirements and are available with intrinsically safe and flameproof approvals. This gives users more flexibility when building a complete level monitoring and control system around the indicator.
Typical Applications
This magnetic level indicator is widely used in hydrogenator off-gas condensate tanks, alkali evaporators in hydrogen peroxide systems, electrolysis workshop water tanks, and water tanks in a wide range of industrial process units. It is especially useful where users need a simple, visible, and economical level indication solution for mildly corrosive liquids.
For other magnetic level solutions, see the [Flap-11A Standard Magnetic Level Indicator] and the [SW-11 Magnetic Switch]. The indicator can also work with a [remote transmitter] when remote signal output is required.
