061B100566 Danfoss Bellows Actuated Pressure Switch

Product Overview

The 061B100566 (061B100566) is a high-precision pressure switch from Danfoss, engineered for demanding industrial monitoring and control applications. Utilizing a sensitive bellows-type sensing element, this switch provides superior repeatability and long-term stability even in environments subject to vibration or pressure fluctuations. The 061B100566 features a specialized setting range of -0.20 to 1.00 bar, making it an ideal solution for low-pressure monitoring, vacuum control, and differential pressure tasks in HVAC, water treatment, and process industry systems. With a maximum working pressure (Pe) of 15.0 bar and an IP65 rated enclosure, this switch ensures reliable performance and safety for critical actuators and alarm circuits.

Technical Configuration

The hardware architecture of the 061B100566 is designed for precision and durability. The core sensing mechanism is a bellows system, which offers a larger surface area than piston-type switches, resulting in higher sensitivity for the low-pressure range of -0.20 to 1.00 bar. The electrical interface is facilitated via a standard Pg 11 connection, ensuring compatibility with industrial cabling standards. For the process connection, it utilizes a G-type threaded interface, providing a secure and leak-proof seal. The internal switch mechanism is designed for high-duty cycles, providing clear setpoint adjustment and reliable switching logic. The IP65 enclosure protects the internal components against dust and low-pressure water jets, allowing for installation in wash-down areas and outdoor environments.

Technical Specifications

Technical FAQs

What are the primary advantages of a bellows sensing element over a piston?

Bellows elements provide much higher sensitivity and lower hysteresis at low pressure ranges (like -0.2 to 1.0 bar). They also eliminate the friction associated with piston seals, leading to better setpoint accuracy and a longer operational lifespan in clean media applications.

Can this switch be used for vacuum applications?

Yes. Since the setting range starts at -0.20 bar, the 061B100566 is suitable for monitoring partial vacuum conditions, such as those found in intake manifolds or specialized ventilation systems.

Is the IP65 rating sufficient for outdoor installation?

Yes, the IP65 rating ensures the switch is dust-tight and protected against water spray from any direction. However, in extreme environments with direct sunlight or heavy ice buildup, a protective weather shield is recommended to preserve the integrity of the Pg 11 cable gland and adjustment scales.

Engineering & Installation Guide

• Setpoint Calibration: When adjusting the setting range (-0.20 to 1.00 bar), use a calibrated master gauge. Always set the switch by increasing the pressure to the desired trip point to account for the internal spring tension. Verify the reset point (differential) to ensure it aligns with your system’s operational requirements.

• Vibration Mitigation: While the bellows element is robust, high-frequency mechanical vibrations can cause premature wear on the microswitch contacts. If installing near heavy pumps or compressors, mount the switch on a vibration-dampening bracket and use a flexible pressure hose to decouple the switch from the primary vibration source.

• Cable Gland Integrity: To maintain the IP65 enclosure rating, ensure the Pg 11 cable gland is properly sized for the cable diameter. Tighten the gland securely to create a compression seal around the cable jacket, preventing moisture from entering the terminal chamber via capillary action.