017D002166 Danfoss RT 260A Differential Pressure Switch

Product Overview

The 017D002166 (RT 260A) is a heavy-duty differential pressure switch from the Danfoss RT series, specifically engineered for industrial and marine applications where reliability and precision are mechanical necessities. The RT 260A is designed to monitor the difference in pressure between two points in a system—typically across filters, pumps, or heat exchangers. With a regulation range of 0.5 to 4 bar, this switch ensures that machinery operates within safe parameters, triggering an alarm or shutting down the system if the pressure differential exceeds or falls below the setpoint. Its robust construction, featuring high-quality bellows and an IP66-rated housing, makes it suitable for demanding environments, including HVAC, refrigeration, and general process industries.

Technical Configuration

The 017D002166 utilizes a sophisticated bellows system (LP bellows) capable of an operational range from -1 to 18 bar, with a maximum working pressure (PS) of 22 bar. The "differential" nature of this switch means it compares two separate pressure inputs via a G 3/8 A ISO 228/1 connection. The mechanical differential is fixed at 0.3 bar, providing a stable switching point with high repeatability. The unit features a single-pole changeover switch (SPDT), allowing it to be used for both "make" and "break" functions depending on the wiring configuration. The RT 260A is particularly valued for its high resistance to pulsation and vibration, which is critical for long-term accuracy in heavy machinery settings.

Technical Specifications

Technical FAQs

How does the RT 260A differ from a standard pressure switch?

A standard switch monitors pressure at a single point relative to the atmosphere. The RT 260A measures the difference between two pressure sources. For example, it can detect when a filter is clogged by measuring the pressure drop from the inlet to the outlet.

Can the differential setpoint be adjusted?

Yes, the main regulation range (0.5 to 4 bar) is adjustable via the internal setting knob. However, the mechanical differential (the "reset" gap) is fixed at 0.3 bar for this specific model to ensure consistent performance.

What is the significance of the "A" in RT 260A?

In the Danfoss RT series, the "A" often indicates compatibility with specific media or specialized contact materials. This model is generally suitable for use with fluorinated refrigerants and ammonia (NH3), making it a versatile choice for large-scale cooling plants.

Engineering & Installation Guide

Mounting and Orientation:

The RT 260A should be mounted on a flat surface or a bracket using the integrated mounting holes. While it can function in various positions, mounting with the bellows facing downward is a recommended engineering practice to prevent any moisture or debris in the system from settling directly on the bellows interface.

Pressure Connection and Sealing:

The unit uses G 3/8 A threads. When installing the pressure lines, use appropriate sealing washers or thread sealant compatible with the medium (e.g., oil, water, or refrigerant). Ensure that the "High" pressure line and "Low" pressure line are connected to the correct ports as marked on the device to ensure the differential logic operates as intended.

Electrical Wiring and Safety:

The switch features an SPDT contact system. Use a 2-core or 3-core cable through the PG 13.5 cable gland. Ensure the gland is tightened correctly to maintain the IP66 environmental seal. In systems subject to high vibration, ensure that the electrical connections are secured with ferrules to prevent intermittent signals or arcing at the contact points.