Utilisation

Detection by conductivity provides a simple and economic solution to level detection for appliances which conduct electricity, even if they have a low level of conductivity.

Conventional applications: High-level safety, Protecting pumps against no-load operation, Adjustment between a minimum point and a maximum point.

Different combinations of electrodes make a number of applications possible:

• Level detection in a tank,
• Detection of several levels in the same tank,
• Adjustment between two levels in the same tank, etc …

Présentation

A Conductive Level Detection channel is made up of two parts :

1. The Electronic Detector :

• A number of relays: one or two (dead contact),
• Sensitivity adjustment: with or without,
• Type of assembly: in cabinet on DIN rail or outside,

2. The Sensor adapted to the specific features of the installation - temperature, pressure, type of fitting, length, etc. It is made up of :

• An electrical connection head,
• A process fitting: flange, threaded a connection, clamp connection, etc …,
• One or more electrodes, rigid or wired.

Operating principle

The electronic detector supplies alternating current which goes through the circuit made up of :

• An ELECTRODE adjusted to the level to be detected,
• A reference ELECTRODE (which may be the tank itself),
• The LIQUID detected, which must be a conductor of electricity, even a poor one.

When the liquid closes the circuit between the electrodes, the current acts on the detector. In the detector, a relay output with a switch contact makes it possible to obtain an alarm, a command, or an adjustment.

Comments

1. By using two electrodes, adjustment can be obtained between two points.

2. Using an alternating measurement signal prevents the occurrence of electrolytic phenomena in the product.

3. Reference :

• if the tank is made of metal, its ground replaces the reference electrode,
• if the walls of the tank are made of an insulating material, it is essential to use a reference electrode.

Technical characteristics

These are given in the manuals provided with each appliance or each family of appliances; These are available on request :

For any special requests please contact us.