Limit switches

Integrating your automated valves utilizing Stonel limit switches will allow you to improve process performance and reduce life-cycle costs. Stonel limit switches offer a full range of monitoring, communication, and control platforms ideally suited for quarter-turn and linear discrete valve applications even in extreme process environments.

Limit switches offering

Stonel™ Eclipse™ modular on/off valve monitor

The Stonel Eclipse provides solid state valve monitoring capabilities in a very compact design for process on/off automated valves. The Eclipse is available with Universal voltage switching, Namur or bus networking control models in Ex I version.

Stonel™ Quartz™ explosionproof on/off valve monitor

The Stonel Quartz discrete valve monitor is available in explosionproof (QX), nonincendive and intrinsically safe (QN), low temperature (QC) and general purpose (QG) versions. The robust epoxy coated aluminum enclosure is extremely durable and well suited for use in corrosive, heavy wash-down environments. A broad range of switches, position transmitters and communication options are available to accommodate most applications.

Stonel™ Hawkeye™ HX

The explosionproof Stonel Hawkeye, with its stainless steel enclosure, is designed for service in harsh process environments. It features a solid state proximity sensor which is encased in a shock absorbent urethane potting material. Outputs for universal switching or NAMUR (EN 60947-5-6; I.S.) are standard options.

Stonel™ Hawkeye™ HK

The solid state Stonel Hawkeye sensor is ideal for point sensing in corrosive and hazardous process environments. The standard Red/Green LEDs also speed your setup and installation by confirming power up and switch status. The Hawkeye is FM and CSA approved for nonincendive applications and intrinsically safe circuits in hazardous areas

Stonel™ Prism™ PI limit switch for linear appliactions

The Stonel Prism PI integrates an advanced position sensing system and integral pneumatic control for sanitary diaphragm and other linear applications. Compact and durable, the PI is suited for corrosive, heavy washdown and hazardous areas.

Stonel™ visual indicator

Clearly view valve position status from up to 75 feet with Stonel stand alone visual Indicator. The indicator’s rugged Lexan® construction makes the indicator resistant to physical damage and tolerant to most corrosives.

Stonel™ Fieldlink™ accessories and tools for process networks

The Stonel Fieldlink product group enables users to take advantage of field-based communication technologies to cut installation and maintenance costs and improve operating performance. With communication networks, vital predictive maintenance and performance measures may also be transmitted from field instruments to the asset management or operation control centers further reducing maintenance costs.

Neles Easyflow™ limit switches, K-series

The Neles Easyflow K-series features versatile limit switches for quarter turn actuators and valve assemblies. With the K-series limit switches our customers receive reliable end limit information of desired rotary travel. Available in selected market areas.

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Compact performance

We offer a versatile selection of limit switches to meet your valve monitoring requirements. The Stonel limit switch offering is known for high quality and reliability that comes in a compact and durable form. This is also true for our Axiom™, Eclipse™, Prism™ and Quartz™ products that are all small in size, but big on performance and reliability. They are all also extremely rugged in design, making them a reliable choice in demanding environments. Our portfolio includes products suited for corrosive and hazardous plant environments.

Smart functionality and options

In addition to providing advanced monitoring and control in a wide range of applications, you can find limit switches in our portfolio that offer great communications options ranging from HART, FOUNDATION FieldBus, AS-interface and DeviceNet to optional WirelessLink capabilities, reducing setup times and improving site safety. With the wireless functionalities in use, diagnostics data can be viewed from up to 50 meters away using your personal Bluetooth-enabled mobile device.

Safety and reliability first

Rugged and durable limit switches ensure continued service in demanding operating conditions. One key element to safety and durability is the casings of our limit switches. Depending on your application and the operating environment we offer a wide range of options. This includes explosion-proof, watertight and corrosion-resistant enclosures as well as non-incendive and intrinsically safe variants approved for hazardous environments. Safety comes from the correct material selection as well as clear and easily visible indications. All our products meet relevant safety certification standards for use in your processes.

What is a limit switch?

Limit switches are generally used in the automation of on-off valve applications. They are typically activated by cams connected to the shaft joining the actuator to the valve. Limit switches send discrete electric signals to indicate valve position, typically confirming either open or closed positions.

Limit switches may be directly mechanically operated by the motion of the operating lever. A reed switch may be used to indicate the proximity of a magnet mounted on some moving part. Proximity switches operate by the disturbance of an electromagnetic field, by capacitance, or by sensing a magnetic field.