Conductivity level sensor

Manual PDF

Use

Detection by conductivity provides a simple and economical solution for detecting levels for electrically conductive products, even if their conductivity is low. Conventional applications: High level security, Protection of pumps against dry running, control between a minimum and a maximum. Different combinations of electrodes provide a variety of applications:

• Detecting one or more levels in a tank,
• Regulation between two levels in a tank, etc.

Introduction

1. The Electronic Detector:

• Number of Relays: one or two (potential-free contact),
• Sensitivity adjustment: with or without,
• Type of assembly: in cabinet on DIN rail or outside.

Functions

The Electronic Detector delivers an alternating current which crosses the circuit formed by:

• an ELECTRODE set to the level to be detected,
• one Reference ELECTRODE (which may be the tank itself),
• the detected LIQUID, which must be electrically conductive, even slightly.

When the LIQUID closes the circuit between the electrodes, the current acts on the Detector and its relay output (changeover contact) gives an alarm, control or regulation.

Remarks

1. The use of two electrodes provides regulation between two points.

2. The use of an AC measuring signal avoids electrolytic phenomena in the product.

3. Reference     : If the tank is metal, its mass replaces the reference electrode.

                        : If the tank wall is insulated, it is essential to use a reference electrode is needed.

Caractéristiques Techniques

1. Détecteurs de Niveaux Conductifs : elles sont détaillées dans les notices spécifiques à chaque appareil.

Sous réserve de modification sans préavis