Description: The Model 409 is a compact, socket-mount device designed for level control of conductive liquids. It features an internal relay that energizes with power application and de-energizes when the liquid level reaches the probe. The relay resets when the level drops below the probe, with a fixed two-second delay to prevent oscillation. It includes an LED indicator for relay status and adjustable sensitivity. A standard 8-pin octal socket is required.

Specifications: The Model 409 operates on voltages of 24 VAC, 120 VAC, and 230 VAC, with a power consumption of 2.5W. It offers transient protection of 2500VRMS for 10msec, a probe voltage of 2 VAC, and a maximum probe current of 5mA. Sensitivity can be adjusted between 1K ohms and 100K ohms. The device has SPDT contacts with a rating of 10A at 240 VAC resistive, and an expected relay life of 10,000,000 mechanical operations and 100,000 electrical operations at rated load. It has a response time of 2 seconds and a reset time of less than 1 second, with automatic reset. The time delay accuracy is ±5%, and it operates in temperatures from -40° to 60°C with a humidity tolerance of 0-97% without condensation. The case is made of ABS plastic, and the device weighs a maximum of 4.5 oz.

Installation Instructions: The device should be mounted in a suitable enclosure, with a NEMA-1 rated enclosure available from Time Mark. Proper AC operating power and probe connections should be made according to the pin diagram. Sensitivity adjustments should be made as needed.

General Safety: The Model 409 contains potentially hazardous voltages at its terminals. Electrical power should be removed during wiring connections, and installation should be performed by qualified personnel.

Warranty: The Model 409 is covered by a 5-year Unconditional Warranty against defects in materials and workmanship. Time Mark will repair or replace the device free of charge within five years from the purchase date.