Bypass level indicators are used for continuous measurement, display and monitoring of liquid levels. The bypass tube is attached to the side wall of the vessel. According to the law of communicating tubes, the level in the bypass tube equals the level in the vessel. A float with embedded magnets in the bypass tube follows the liquid level and transfers it in a non-contacting manner to a display fitted outside the tube or a display fitted outside the tube or to a monitoring device. Applications include sewage, dyeing, power generation, boiler and petro-chemical. The following indication and monitoring devices are available:
Magnetic roller indicator
As the float passes by, the red/white rollers are rotated in succession by 180 deg; around their own axes. The rollers change from white to red as the level rises and from red to white as the level falls. The level is continuously displayed as a red column, even when the power fails.
A magneto-restrictive transmitter can be mounted outside the bypass tube to transmit the level. A continuous standard signal of 4 to 20 mA is output by means of a fitted transmitter.
Reed contacts for limit-value acquisition or also for level control can be secured to the bypass tube.