Vibrating fork level switch for liquids in tanks and pipelines
Mike Edwards
Products Kobold Canada liquid level switch NWS pipelines tanks
The Kobold liquid level switch NWS is designed as a 2-and 3-wire switch and can be universally used in tanks and pipelines.
The liquid level switch operates on the tuning fork principle in air at resonance frequency.
A piezoelectric crystal is used for excitation of oscillations and for monitoring the actual oscillation frequency.
When the fork is immersed in liquid, the frequency changes: this change is detected electronically, and the output signal is changed.
The unit operates as a 2-wire switch in series with the load. The simple electronic switch is operated by the liquid.
The device can also be connected to a PLC through a third terminal and has an output state indicator with an LED that can be seen though a lens in the cover.
The LED flashes about once a second when the unit has switched off and is permanently illuminated when it is switched on.
The LED is an optical confirmation that the device is working correctly, and the condition of the wet side is correctly displayed.
The switch can be set as upper or lower limiter with a mode selector.
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