Magnetic flap indicators give a direct local reading with no power at the gauge: a float with a magnet drives red/white rollers, readable at a distance, with optional 4-20mA transmitter and level switches.
UHZ-52 Magnetic Level Indicator (Magnetic Flap Level Gauge)
Magnetic flap level gauge for local level and interface indication on open or pressurized vessels, 200 mm to 15 m, -200 C…
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