KOBOLD bypass levelindicators are used for continous measurement, display and monitoring of liquid levels. The bypass tube is attached on 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 circular 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 to a monitoring device.
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° around their own axes. The rollers change from white to red as the levil rises and from red to white as the level falls. The advantage of ball display is the higher protection category, good visibility of 180° and higher vibration resistance with filled version. The level in a tank or a mixer is continously displayed as a red column, even when the power fails.
The remotely transmit the level a transmitter with a chain of resistors or a magnetostrictive transducer can be mounted outside the bypass tube. A continous standard signal of 4...20mA is generated by means of a fittet transmitter. This standard signal can then be displayed on analogue or digital indicating devices. Optinally Hart®, PROFIBUS®-PA or FoundationTM Fieldbus communication protocols are possible.
Universal indicating unit
A universal indicating unit of type series ADI can be mounted on the bypass to display and evaluate the standard signal (4...20mA) generated by the transmitter.
One or more reed contacts for limit-value acquisition or also for level control can be secured to the bypass tube.