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Liquid Level Switch NWS

Liquid Level Switch NWS

For liquids

The KOBOLD liquid level switch NWS is designed as a 2 and 3-wire switch and can be universally used in vessels and pipelines. The NWS 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 NWS operates as a 2-wire switch in series with the load. The simple electronic switch is operated by the liquid. The NWS can also be connected to a PLC through a third terminal.

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Membrane Level Monitor NMF

Membrane Level Monitor NMF

For bulks

Membrane level monitors allow economic level monitoring of bulk goods in storage vessels.
They may be used to indicate full and empty states and load demand for dusty, powdery, granulated and grainy bulk goods.
They are suitable for use with bulk materials (0.3 to 2.5 t/m3) and particle sizes up to 30 mm.
The devices will operate faultlessly provided the bulk goods flow easily at not too small an angle.
Only such materials exert sufficient operating pressure on the detector fitted in the wall of the silo.

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Conductive Suspended Electrode NEH

Conductive Suspended Electrode NEH

For conductive liquids

KOBOLD limit switches model NEH are used for level monitoring and pump control of conductive liquids. The instruments operate on the conductive principle. A low a. c. voltage is applied between the conductive side of the tank or the earth electrode (longest electrode) and a switching point electrode.
If the conductive medium touches the electrodes, a negligible alternating current fl ows across the electrodes and the conductive medium to the electrode relay. Suspended electrodes are ideally suited for installation when space is at a premium.
The relay amplifi es the alternating current and operates a switching relay or a pump controller. An electrode relay of type NE-104 is required per switch point for signalling. For min./max. control two switching point electrodes must be connected to the relay. Relay NE-304 operates as two single relays (NE-104).

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