INSTEK CONTROL (PTY) LTD

NCS-01, NCS-02

NCS-01, NCS-02

Capacitive Limit Switch Food NCS

Application/Specifi ed usage

• Limit detection of media with low or no water content like syrup, fruit concentrates, alcohols und oils with a dielectric constant εr (Dk) ≥ 2

Application examples

• Limit detection in vessels (build-in position sidewise) or pipes ·
• High alarm in vessels and tanks with build-in position from top (type NCS-L) ·
• Empty alarm in vessels and tanks with build-in position from bottom (type NCS-L) ·
• Product monitoring in pipes ·
• Pump / dry running protection

Hygienic design/Process connection

• Flow optimized, hygienic and easy sterilizable installation by sleeve EMZ-132 or build-in system EHG-.../1/2" and EHG-.../M12 ·
• CIP-/ SIP-cleaning up to 143 °C / maximum 120 minutes ·
• Product contacting materials compliant to FDA ·
• Sensor made of stainless steel, sensor tip made of PEEK ·
• Process connections see product information CLEANadapt, e.g: Tri-Clamp, dairy fl ange (DIN 11851), Varivent ... ·
• Conforming to 3-A Sanitary Standard 74-06

Features

• Independent of the conductivity ·
• NCS-L: Insensitive to foam and adherence, reliable at pasty media ·
• Short response time (< 1 s) ·
• Reversible output (full / empty active) ·
• Heated electronic to avoid condensation ·
• Simulation of sensor status possible

Options/Accessories

• LED state indicator with inspection window lid ·
• Version with spacer (option H) for isolated vessels or permanent process temperatures up to 143 °C (available for NCS-x1 and NCS-x2) ·
• NPN output (Open Collector) ·
• M12-plug and matching cable assembly ·
• Heating element switched off for extension of the temperature range

Measuring principle

The capacity of a capacitor is aff ected by 3 factors: Distance and size of the electrodes as well as the kind of medium between the electrodes. Using the capacitive sensors only the kind of medium is of interest.

The electrode of the sensor and surface of tank can be seen as capacitor, the medium as dielectric fl uid. Caused by the higher Dk-value of the medium compared to air the capacity increases if the sensor is covered with the medium. The change of capacity is evaluated by electronics and converted into a corresponding switching order. This functional principle requires that the sensor tip is completely covered with medium. That way the sensor is insensitive to foam and adherences.