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SA Instrumentation & Control Buyers' Guide

 

Secure liquid level detection
May 2017, Level Measurement & Control


Kobold has capacitive level indicators, type NMC, specifically designed to measure liquid levels in tanks. They consist of a measuring probe and a connecting head with a plug-in evaluation module. Depending on the operating conditions, different probes are available:

• NMC-N: Standard version with metal tanks inserted, their walls undertaking the task of a second electrode. It is applicable for fluid foods as well as for different waters.

• NMC-S: The two probe sensor for non-metal tanks for operation in aggressive media.

• NMC-T: Especially for operation in non-metal holding tanks and media of lower conductivity, the designed probe consists of an interior probe and a surrounding pipe of stainless steel serving as a reference electrode.

• NMC-H: The electronics of one stick probe of stainless steel is thermally insulated by a special intermediate piece so that the sensor technology can easily handle up to 125°C.

Working principle

The measuring system is based on the capacitive measuring method. The measuring probe and the tank wall, or the second electrode form the plates of a capacitor; the medium in the tank is the dielectric fluid. The capacity depends on the medium. The more the medium touches the measuring probe, the higher the capacity. This change is detected by the plug-in evaluation module and transformed in a percentage display or a 4-20 mA signal. As there are no movable parts, the unit operates almost wear-free. Lengths of PTFE coated measuring probes of stainless steel can be freely chosen up to 4000 mm. Problematic apertures at holding tank base or at the side can be avoided by virtue of a simple and secure assembly from top. Fields of application include:

• Water or water-like liquid.

• Liquid food.

• Chemicals and aggressive liquids.

• Oil

• Pharmaceutical liquids.


Credit(s)
Supplied By: Instrotech
Tel: +27 11 462 1920
Fax: +27 11 462 1958
Email: sales@instrotech.co.za
www: www.instrotech.co.za
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Further reading:

  • Accurate groundwater level measurement – hydrostatically
    December 2017, Instrotech, Level Measurement & Control
    Measurement specialist Keller offers probes to monitor groundwater and filling levels in tanks under a wide range of conditions.
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    Since the control of humidity is vital for many processes in pharmaceutical manufacturing, there are a large number of probes in use at any time – all of which will need to be calibrated to ensure accuracy. ...
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    October 2017, Instrotech, Flow Measurement & Control
    Kobold has a turbine wheel flowmeter, model DOT, that is perfectly suited to low viscosity applications. Proven turbine wheel technology measures and monitors difficult media such as distilled water, ...
  • Endress+Hauser offers radar via online shop
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  • Monitoring gas burners
    October 2017, Instrotech, Flow Measurement & Control
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  • Low power pressure sensors optimised for IoT
    September 2017, Instrotech, Sensors & Transducers
    Keller, a leading manufacturer of pressure sensors, is at the forefront when it comes to implementing IoT solutions. IoT processes are highly customised and require continuous development. Keller has ...

 
 
         
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