KPS 81 Danfoss 060L313466 Heavy Duty Temperature Switch

Product Overview

The KPS81 060L313466 (060L313466) is a high-durability temperature-controlled switch from the KPS series, specifically engineered for demanding industrial and marine applications. Designed to operate under intense vibration, shock, and thermal stress, this thermostat provides critical regulation and alarm functions in environments such as engine rooms, power plants, and hydraulic systems. With a robust pressure-operated contact system and an adjustable differential, the 060L313466 ensures precise control of cooling water, lubrication oil, and steam processes. Its superior mechanical construction guarantees long-term stability and resistance to ambient temperature fluctuations, making it an essential component for preventing equipment overheating and ensuring operational safety in heavy-duty sectors.

Technical Configuration

The KPS 81 features a specialized vapor-charge sensor connected via a 5 m capillary tube, allowing for flexible remote mounting of the switch housing away from the heat source. The sensing element is optimized for high-temperature detection, with a maximum permissible sensor temperature of 250 deg C. The internal contact system is a single-pole double-throw (SPDT) snap-action switch, providing reliable electrical switching even under high mechanical vibration. The unit includes an adjustable mechanical differential, allowing engineers to fine-tune the gap between the "cut-in" and "cut-out" temperatures to prevent rapid cycling of pumps or fans. The enclosure is designed for harsh conditions, typically offering high protection ratings suitable for engine-mounted or outdoor installations.

Technical Specifications

Technical FAQs

How do I adjust the temperature setpoint and differential on the KPS 81?

The setpoint is adjusted via the internal range scale, while the differential is set using the separate differential screw. Always set the range first, then calibrate the differential to ensure the switch triggers at the correct reset point for your specific cooling or heating loop.

Is this switch suitable for marine engine applications?

Yes, the KPS series is specifically designed with high vibration resistance (up to 4 g in the 2-100 Hz range), meeting the stringent requirements of major marine classification societies for engine room and deck mounting.

What happens if the sensor temperature exceeds the setting range?

The KPS 81 can withstand a maximum sensor temperature of 250 deg C without damage to the sensing bulb or calibration. However, the switch will remain in its activated state until the temperature drops back within the differential range.

Engineering & Installation Guide

Capillary Tube Protection: During installation, avoid sharp bends or kinking of the 5 m capillary tube. A minimum bend radius of 25 mm is recommended. In high-vibration areas, ensure the capillary is secured every 500 mm with cushioned clamps to prevent work-hardening and eventual fracture of the copper line.

Sensor Pocket Integration: To ensure rapid thermal response and accurate sensing, the sensor must be fully submerged in the medium. Use a thermal conductive paste when inserting the bulb into a 110 mm or 160 mm sensor pocket. This eliminates air gaps that act as insulators, which otherwise cause significant lag in temperature detection.

Electrical Connection: For inductive loads (such as large contactors or solenoid valves), it is best practice to install a snubber circuit or RC-filter across the contacts. This minimizes arcing during the snap-action transition, significantly extending the life of the silver-plated contact surfaces in high-cycle applications.