061B100966 Danfoss Bellows Pressure Switch (-0.2 to 1.0 bar)

Product Overview

The 061B100966 (061B100966) is a professional-grade industrial pressure switch from Danfoss, engineered for high-sensitivity monitoring in low-pressure and vacuum systems. Utilizing a specialized bellows sensing element, this switch provides reliable mechanical switching logic within a range of -0.20 to 1.00 bar. It is primarily used as a safety or regulatory component to monitor air, gas, or fluid pressures in applications such as industrial boiler systems, vacuum pumps, and ventilation units. With a robust IP65-rated housing and a high maximum working pressure (Pe) of 15 bar, the 061B100966 ensures long-term operational stability even in environments prone to dust, moisture, and unexpected system pressure surges.

Technical Configuration

The 061B100966 is defined by a modular technical specification designed for precision:

• Bellows Sensing Element: The internal bellows provide a large surface area for pressure detection, allowing the switch to respond to minute fluctuations in pressure or vacuum with high repeatability.

• Broad Safety Margin: Despite its low operating range (up to 1.0 bar), the unit is rated for a maximum working pressure (Pe) of 15.0 bar, protecting the sensing element from damage during system pressure tests.

• Industrial Standard Connections: Features a standard G-threaded pressure connection and a Pg 11 electrical cable gland, facilitating easy integration into existing industrial piping and wiring infrastructures.

• Environmental Protection: The IP65 enclosure rating ensures the device is dust-tight and protected against low-pressure water jets, making it suitable for damp mechanical rooms or outdoor sheltered installations.

Technical Specifications

Technical FAQs

How does a bellows-type sensing element differ from a piston or diaphragm?

Bellows elements are highly flexible and provide a significant range of motion even at very low pressures. This makes the 061B100966 much more sensitive and accurate for low-pressure/vacuum applications compared to a piston (which is for high pressure) or a simple diaphragm (which has less travel).

Can this switch be used for "Vacuum Break" monitoring?

Yes. Since the range starts at -0.20 bar, it is specifically designed to detect when a system loses its vacuum or fails to maintain the required negative pressure, triggering a pump or an alarm as needed.

What is the significance of the "66" setting range code?

In Danfoss nomenclature, "66" refers to a specialized or "Other" setting range. In this case, it indicates the specific calibration of -0.20 to 1.00 bar, which falls outside the standard high-pressure ranges typically found in heavy industrial switches.

Engineering & Installation Guide

• Mounting Strategy: For best results, mount the switch with the pressure connection facing downwards. This prevents any moisture or process condensate from settling inside the bellows, which could lead to corrosion or calibration drift over time.

• Electrical Sealing: To maintain the IP65 rating, ensure that the Pg 11 cable gland is tightened firmly against the cable jacket. Use a cable with an outer diameter that matches the gland’s sealing range to prevent water ingress into the terminal chamber.

• Wiring for Control: The switch typically utilizes SPDT (Single Pole Double Throw) contacts. You can wire it to "break" the circuit on rising pressure (for compressor control) or to "make" the circuit on falling pressure (for low-limit alarms). Always verify the contact ratings against your control voltage (e.g., 230V AC vs 24V DC).