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Capacitive liquid level monitors

INSTROTECH is offering Kobold’s NSC capacitive liquid level monitors that offer protection against overfilling of bulk solids. Monitoring of minimum level is also possible at low levels and with light media with low medium density. The device is specifically designed for application with varying grades of solids, for example cement, sand, flint and animal feed.

The tested measuring system is based on properties of a capacitor. With this device, the level monitor metallic electrode and metallic tank wall assume the tasks of condenser plates. When room between these two plates is filled by a medium, voltage potential changes. Voltage change, very reliably, signals excess and undercut of limit value. The switching point is thus determined by position of the probe head.


Two different device versions enable optimum positioning of the probe head in respective applications. Probe length can be individually chosen corresponding to respective maximum level switching point.  With PTFE-coated rigid probe, the model NSC-R. Thereby a maximum of 3000 mm is possible with vertical assembly. Cable probe NSC-C is installed from the top and with a length of 15 m, and it can also be used for large vessels. The polypropylene coated cable can be individually shortened to the customers’ required length.

These very rugged and reliable measuring instruments operate without movable parts and  are thus almost wear-free. They can be adjusted to the particular measuring task with the pluggable module by DIP switches and potentiometer. Probes are designed so that caking/crustification in the vicinity of tank aperture does not lead to error messages. They are suitable for operation in dust-ex-zones and available with approval according to ATEX II 1/2 D (EExia IIA).

Key features of the NSC capacitive liquid level monitors:

  • Measuring range: 265 – 3 000 mm
  • tmax 80 ÅãC; pmax 0.5 bar
  • Connection: G 1 male, Adapter: G 1., G 1., round flange, weld-in sleeve 1 relay, SPDT

Contact INSTROTECH for more information on Kobold’s NSC capacitive liquid level monitors, on 010 595 1831 or sales@instrotech.co.za

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