Level control relay AT-DR50

Overview
The AT-DR50 level control relay for conductive liquids is a device used to monitor and regulate the level of water, aqueous solutions or certain chemicals in a tank, reservoir or industrial installation. It reads signals from AT-SONDE electrodes and activates or deactivates a control circuit (pump, solenoid valve, alarm, etc.). Operation typically uses a low safety voltage applied to the electrodes to avoid electrolysis or corrosion.

Functions

• Low-level detection (dry-run protection, pump control).
• High-level detection (overflow prevention).
• Maintain a constant level via automatic filling or emptying control.

Operating principle
The device operates based on the electrical conductivity of the liquid. Electrodes or probes are placed at different heights in the tank; when the liquid contacts these electrodes it allows current to pass between them. The relay detects this conduction and triggers actions according to the reached level.

Design
Designed and manufactured in France.

Technical specifications

• Supply voltage: 220 V
• Sensitivity: Adjustable up to 100 Ω
• Operating temperature: -10 to +55 °C
• Maximum number of probes: 3
• Response time: 100 ms
• Contact rating: 5 A - 240 V
• Power consumption: 5 VA
• Probe weight: 45 g
• Dimensions: 90 x 54 x 59 mm