Positioners and Limit Switches
Positioners and limit switches are crucial in various industrial applications, ensuring precise control and safety measures. Positioners are devices designed to accurately control the position of a valve or actuato...
Categories in Positioners & Limit Switches (1)
Limit Switch Enclosures
Limit switch enclosures are essential to protect limit switches from harsh environmental conditions, ensuring their reliability and longevity. These enclosures provide secure housing for limit switches, shielding them from dust, moisture, and other contaminants that could compromise their performance. Whether installed in indoor or outdoor environments, limit switch enclosures safeguard the integrity of the switches, allowing them to function effectively in demanding industrial settings. With various configurations available, including weatherproof and explosion-proof options, limit switch enclosures offer versatile solutions to meet the diverse needs of different applications. From manufacturing plants to offshore oil rigs, these enclosures play a critical role in maintaining industrial machinery and processes' operational efficiency and safety.
Filter
Filter
989 items
content loaded
TopWorx™ DX-Series Controllers are certified for use in every world area.
D-Series discrete valve controllers can survive in virtually any plant condition. Its corrosion resistance and heavy-duty construction enables superior performance in the most demanding applications. These controllers carry IECEx, ATEX, and UL certifications in a single model, making it easier for global customers to standardize operations across their facilities. D-Series controllers also carries NEPSI, KOSHA, InMetro, PESO, and EAC and EAC certifications.
Engineered with our GO Switch sensing technology, our D-Series line delivers best-in-class capabilities. TopWorx GO Switches are hermetically sealed to outperform all other position sensors in hot, cold, wet, dirty, abusive, corrosive, and explosive conditions. Its unique cam design allows quick and accurate setting of the GO Switch positions reducing deadband and hysteresis to a minimum.
D-Series discrete valve controllers can survive in virtually any plant condition. Its corrosion resistance and heavy-duty construction enables superior performance in the most demanding applications. These controllers carry IECEx, ATEX, and UL certifications in a single model, making it easier for global customers to standardize operations across their facilities. D-Series controllers also carries NEPSI, KOSHA, InMetro, PESO, and EAC and EAC certifications.
Engineered with our GO Switch sensing technology, our D-Series line delivers best-in-class capabilities. TopWorx GO Switches are hermetically sealed to outperform all other position sensors in hot, cold, wet, dirty, abusive, corrosive, and explosive conditions. Its unique cam design allows quick and accurate setting of the GO Switch positions reducing deadband and hysteresis to a minimum.
Requires Quote
Available for Purchase
Subject to factory lead times
The TopWorx™ DXR packs all the versatility of the single platform DXP into a rugged, corrosion-proof Valox® resin enclosure. The DXR is perfect for use in corrosive environments.
D-Series discrete valve controllers can survive in virtually any plant condition. Its corrosion resistance and heavy-duty construction enables superior performance in the most demanding applications. These controllers carry IECEx, ATEX, and UL certifications in a single model, making it easier for global customers to standardize operations across their facilities. D-Series controllers also carries NEPSI, KOSHA, InMetro, PESO, and EAC and EAC certifications.
Engineered with our GO Switch sensing technology, our D-Series line delivers best-in-class capabilities. TopWorx GO Switches are hermetically sealed to outperform all other position sensors in hot, cold, wet, dirty, abusive, corrosive, and explosive conditions. Its unique cam design allows quick and accurate setting of the GO Switch positions reducing deadband and hysteresis to a minimum.
D-Series discrete valve controllers can survive in virtually any plant condition. Its corrosion resistance and heavy-duty construction enables superior performance in the most demanding applications. These controllers carry IECEx, ATEX, and UL certifications in a single model, making it easier for global customers to standardize operations across their facilities. D-Series controllers also carries NEPSI, KOSHA, InMetro, PESO, and EAC and EAC certifications.
Engineered with our GO Switch sensing technology, our D-Series line delivers best-in-class capabilities. TopWorx GO Switches are hermetically sealed to outperform all other position sensors in hot, cold, wet, dirty, abusive, corrosive, and explosive conditions. Its unique cam design allows quick and accurate setting of the GO Switch positions reducing deadband and hysteresis to a minimum.
Requires Quote
Available for Purchase
Subject to factory lead times
The TopWorx™ DXS is a 316 stainless steel valve controller that combines bus networking, pilot valve, and position sensors into a single globally certified, explosion proof enclosure that attaches to any automated valve package.
D-Series discrete valve controllers can survive in virtually any plant condition. Its corrosion resistance and heavy-duty construction enables superior performance in the most demanding applications. These controllers carry IECEx, ATEX, and UL certifications in a single model, making it easier for global customers to standardize operations across their facilities. D-Series controllers also carries NEPSI, KOSHA, InMetro, PESO, and EAC and EAC certifications.
Engineered with our GO Switch sensing technology, our D-Series line delivers best-in-class capabilities. TopWorx GO Switches are hermetically sealed to outperform all other position sensors in hot, cold, wet, dirty, abusive, corrosive, and explosive conditions. Its unique cam design allows quick and accurate setting of the GO Switch positions reducing deadband and hysteresis to a minimum.
D-Series discrete valve controllers can survive in virtually any plant condition. Its corrosion resistance and heavy-duty construction enables superior performance in the most demanding applications. These controllers carry IECEx, ATEX, and UL certifications in a single model, making it easier for global customers to standardize operations across their facilities. D-Series controllers also carries NEPSI, KOSHA, InMetro, PESO, and EAC and EAC certifications.
Engineered with our GO Switch sensing technology, our D-Series line delivers best-in-class capabilities. TopWorx GO Switches are hermetically sealed to outperform all other position sensors in hot, cold, wet, dirty, abusive, corrosive, and explosive conditions. Its unique cam design allows quick and accurate setting of the GO Switch positions reducing deadband and hysteresis to a minimum.
Requires Quote
Available for Purchase
Subject to factory lead times
TopWorx™ ESD Valve Controllers provide a complete Partial Stroke Test Solution with unique features and functionality that enable partial stroke testing of emergency shutdown valves without disrupting or shutting down the process.
Requires Quote
Available for Purchase
Subject to factory lead times
The DXN discrete valve monitor is qualified for use in containment and is the best solution for quarter-turn AOVs. It contains two GO Switches to give open/close indication, a ceramic terminal block and it mounts onto the actuator.
Requires Quote
Available for Purchase
Subject to factory lead times
The GO™ Switch Model 11 features sealed gold flashed contacts, no-touch sensing and snap action response in a square switch design with a 3/8™ sensing range.
Requires Quote
Available for Purchase
Subject to factory lead times
A slight modification to an all-time favorite, model 12 was designed to meet ATEX/IECEx Zone 1, Ex ’de’ flameproof and increased safety hazardous area classification.
Requires Quote
Available for Purchase
Subject to factory lead times
Offering the same features as the GO™ Switch Model 11, The Model 21 GO™ Switch provides a smaller design. All GO™ Switch wiring options include A/C, D/C, N/O or N/C, consumes no power to operate and has no current leakage or voltage drop.
Requires Quote
Available for Purchase
Subject to factory lead times
A lower profile version of model 12, model 22 is also available with ATEX/IECEx Zone 1, Ex ’de’ flameproof and increased safety hazardous area classification in a smaller package.
Requires Quote
Available for Purchase
Subject to factory lead times
TopWorx™ 52M is a low profile, dry contact, proximity sensor with a 316L sensing face in an industry standard 12mm package. The 52M does not require power to operate and is polarity insensitive with zero need to specify NPN or PNP circuits and maintains the ability to be a plug-and-play replacement for inductive proximity sensors. Also, the 52M can handle a wide current range from 5mA to 2A @ 24VDC and a wide temperature range from -40°F to 212°F (-40°C to 100°C).
Requires Quote
Available for Purchase
Subject to factory lead times
A lower profile version of model 12, model 22 is also available with ATEX/IECEx Zone 1, Ex ’de’ flameproof and increased safety hazardous area classification in a smaller package.
Requires Quote
Available for Purchase
Subject to factory lead times
The GO™ Switch Model 72 has the smallest diameter (3/8") of any round leverless limit switch, and is used extensively in factory automation applications.
Requires Quote
Available for Purchase
Subject to factory lead times
The GO™ Switch Models 73 and 74 are the world’s most commonly used and widely trusted leverless limit switches with no external moving parts, no springs or cams, and no reed element. There is nothing to wear or fail.
Requires Quote
Available for Purchase
Subject to factory lead times
The GO™ Switch Models 73 and 74 are the world’s most commonly used and widely trusted leverless limit switches with no external moving parts, no springs or cams, and no reed element. There is nothing to wear or fail.
Requires Quote
Available for Purchase
Subject to factory lead times
GO™ Switch Model 75 offers a wide application temperature range and is excellent for sensing in high pressure and corrisive areas.
Requires Quote
Available for Purchase
Subject to factory lead times
GO™ Switch Model 76 provides extended length and offers a wide application temperature range and is excellent for sensing in high pressure and corrisive areas.
Requires Quote
Available for Purchase
Subject to factory lead times
GO™ Switch Model 77 has the same great features of Models 73 and 74 but with the added benefit of a much greater length.
Requires Quote
Available for Purchase
Subject to factory lead times
The Model 7C has a 1.025" probe and all the all the features and benefits of the Stroke to GO™ cylinder position sensor product line.
Requires Quote
Available for Purchase
Subject to factory lead times
The Model 7D has a 1.25" probe and all the all the features and benefits of the Stroke to GO™ cylinder position sensor product line.
Requires Quote
Available for Purchase
Subject to factory lead times
The Model 7E has a 2.062" probe and all the all the features and benefits of the Stroke to GO™ cylinder position sensor product line.
Requires Quote
Available for Purchase
Subject to factory lead times
The Model 7F has a 2.062" probe and all the all the features and benefits of the Stroke to GO™ cylinder position sensor product line.
Requires Quote
Available for Purchase
Subject to factory lead times
The GO™ Switch Model 7G leverless limit switche offers unique options such as hermetic seal and Double Pole Double Throw (DPDT) contact arrangements.
Requires Quote
Available for Purchase
Subject to factory lead times
The GO™ Switch Model 7H leverless limit switch differs from the 7G in that it has no conduit hub. Like the 7G, its solid stainless steel construction and global certifications make it the ideal choice for a variety of applications.
Requires Quote
Available for Purchase
Subject to factory lead times
Model 7I is the largest of all GO Switches and offers a longer thread to allow for end of travel indication in large hydraulic or pneumatic cylinders.
Requires Quote
Available for Purchase
Subject to factory lead times
TopWorx™ DX-Series Controllers are certified for use in every world area.
D-Series discrete valve controllers can survive in virtually any plant condition. Its corrosion resistance and heavy-duty construction enables superior performance in the most demanding applications. These controllers carry IECEx, ATEX, and UL certifications in a single model, making it easier for global customers to standardize operations across their facilities. D-Series controllers also carries NEPSI, KOSHA, InMetro, PESO, and EAC and EAC certifications.
Engineered with our GO Switch sensing technology, our D-Series line delivers best-in-class capabilities. TopWorx GO Switches are hermetically sealed to outperform all other position sensors in hot, cold, wet, dirty, abusive, corrosive, and explosive conditions. Its unique cam design allows quick and accurate setting of the GO Switch positions reducing deadband and hysteresis to a minimum.
D-Series discrete valve controllers can survive in virtually any plant condition. Its corrosion resistance and heavy-duty construction enables superior performance in the most demanding applications. These controllers carry IECEx, ATEX, and UL certifications in a single model, making it easier for global customers to standardize operations across their facilities. D-Series controllers also carries NEPSI, KOSHA, InMetro, PESO, and EAC and EAC certifications.
Engineered with our GO Switch sensing technology, our D-Series line delivers best-in-class capabilities. TopWorx GO Switches are hermetically sealed to outperform all other position sensors in hot, cold, wet, dirty, abusive, corrosive, and explosive conditions. Its unique cam design allows quick and accurate setting of the GO Switch positions reducing deadband and hysteresis to a minimum.
Requires Quote
Available for Purchase
Subject to factory lead times
The TopWorx™ DXR packs all the versatility of the single platform DXP into a rugged, corrosion-proof Valox® resin enclosure. The DXR is perfect for use in corrosive environments.
D-Series discrete valve controllers can survive in virtually any plant condition. Its corrosion resistance and heavy-duty construction enables superior performance in the most demanding applications. These controllers carry IECEx, ATEX, and UL certifications in a single model, making it easier for global customers to standardize operations across their facilities. D-Series controllers also carries NEPSI, KOSHA, InMetro, PESO, and EAC and EAC certifications.
Engineered with our GO Switch sensing technology, our D-Series line delivers best-in-class capabilities. TopWorx GO Switches are hermetically sealed to outperform all other position sensors in hot, cold, wet, dirty, abusive, corrosive, and explosive conditions. Its unique cam design allows quick and accurate setting of the GO Switch positions reducing deadband and hysteresis to a minimum.
D-Series discrete valve controllers can survive in virtually any plant condition. Its corrosion resistance and heavy-duty construction enables superior performance in the most demanding applications. These controllers carry IECEx, ATEX, and UL certifications in a single model, making it easier for global customers to standardize operations across their facilities. D-Series controllers also carries NEPSI, KOSHA, InMetro, PESO, and EAC and EAC certifications.
Engineered with our GO Switch sensing technology, our D-Series line delivers best-in-class capabilities. TopWorx GO Switches are hermetically sealed to outperform all other position sensors in hot, cold, wet, dirty, abusive, corrosive, and explosive conditions. Its unique cam design allows quick and accurate setting of the GO Switch positions reducing deadband and hysteresis to a minimum.
Requires Quote
Available for Purchase
Subject to factory lead times
The TopWorx™ DXS is a 316 stainless steel valve controller that combines bus networking, pilot valve, and position sensors into a single globally certified, explosion proof enclosure that attaches to any automated valve package.
D-Series discrete valve controllers can survive in virtually any plant condition. Its corrosion resistance and heavy-duty construction enables superior performance in the most demanding applications. These controllers carry IECEx, ATEX, and UL certifications in a single model, making it easier for global customers to standardize operations across their facilities. D-Series controllers also carries NEPSI, KOSHA, InMetro, PESO, and EAC and EAC certifications.
Engineered with our GO Switch sensing technology, our D-Series line delivers best-in-class capabilities. TopWorx GO Switches are hermetically sealed to outperform all other position sensors in hot, cold, wet, dirty, abusive, corrosive, and explosive conditions. Its unique cam design allows quick and accurate setting of the GO Switch positions reducing deadband and hysteresis to a minimum.
D-Series discrete valve controllers can survive in virtually any plant condition. Its corrosion resistance and heavy-duty construction enables superior performance in the most demanding applications. These controllers carry IECEx, ATEX, and UL certifications in a single model, making it easier for global customers to standardize operations across their facilities. D-Series controllers also carries NEPSI, KOSHA, InMetro, PESO, and EAC and EAC certifications.
Engineered with our GO Switch sensing technology, our D-Series line delivers best-in-class capabilities. TopWorx GO Switches are hermetically sealed to outperform all other position sensors in hot, cold, wet, dirty, abusive, corrosive, and explosive conditions. Its unique cam design allows quick and accurate setting of the GO Switch positions reducing deadband and hysteresis to a minimum.
Requires Quote
Available for Purchase
Subject to factory lead times
TopWorx™ ESD Valve Controllers provide a complete Partial Stroke Test Solution with unique features and functionality that enable partial stroke testing of emergency shutdown valves without disrupting or shutting down the process.
Requires Quote
Available for Purchase
Subject to factory lead times
The DXN discrete valve monitor is qualified for use in containment and is the best solution for quarter-turn AOVs. It contains two GO Switches to give open/close indication, a ceramic terminal block and it mounts onto the actuator.
Requires Quote
Available for Purchase
Subject to factory lead times
The GO™ Switch Model 11 features sealed gold flashed contacts, no-touch sensing and snap action response in a square switch design with a 3/8™ sensing range.
Requires Quote
Available for Purchase
Subject to factory lead times
A slight modification to an all-time favorite, model 12 was designed to meet ATEX/IECEx Zone 1, Ex ’de’ flameproof and increased safety hazardous area classification.
Requires Quote
Available for Purchase
Subject to factory lead times
Offering the same features as the GO™ Switch Model 11, The Model 21 GO™ Switch provides a smaller design. All GO™ Switch wiring options include A/C, D/C, N/O or N/C, consumes no power to operate and has no current leakage or voltage drop.
Requires Quote
Available for Purchase
Subject to factory lead times
A lower profile version of model 12, model 22 is also available with ATEX/IECEx Zone 1, Ex ’de’ flameproof and increased safety hazardous area classification in a smaller package.
Requires Quote
Available for Purchase
Subject to factory lead times
TopWorx™ 52M is a low profile, dry contact, proximity sensor with a 316L sensing face in an industry standard 12mm package. The 52M does not require power to operate and is polarity insensitive with zero need to specify NPN or PNP circuits and maintains the ability to be a plug-and-play replacement for inductive proximity sensors. Also, the 52M can handle a wide current range from 5mA to 2A @ 24VDC and a wide temperature range from -40°F to 212°F (-40°C to 100°C).
Requires Quote
Available for Purchase
Subject to factory lead times
A lower profile version of model 12, model 22 is also available with ATEX/IECEx Zone 1, Ex ’de’ flameproof and increased safety hazardous area classification in a smaller package.
Requires Quote
Available for Purchase
Subject to factory lead times
The GO™ Switch Model 72 has the smallest diameter (3/8") of any round leverless limit switch, and is used extensively in factory automation applications.
Requires Quote
Available for Purchase
Subject to factory lead times
The GO™ Switch Models 73 and 74 are the world’s most commonly used and widely trusted leverless limit switches with no external moving parts, no springs or cams, and no reed element. There is nothing to wear or fail.
Requires Quote
Available for Purchase
Subject to factory lead times
The GO™ Switch Models 73 and 74 are the world’s most commonly used and widely trusted leverless limit switches with no external moving parts, no springs or cams, and no reed element. There is nothing to wear or fail.
Requires Quote
Available for Purchase
Subject to factory lead times
GO™ Switch Model 75 offers a wide application temperature range and is excellent for sensing in high pressure and corrisive areas.
Requires Quote
Available for Purchase
Subject to factory lead times
GO™ Switch Model 76 provides extended length and offers a wide application temperature range and is excellent for sensing in high pressure and corrisive areas.
Requires Quote
Available for Purchase
Subject to factory lead times
GO™ Switch Model 77 has the same great features of Models 73 and 74 but with the added benefit of a much greater length.
Requires Quote
Available for Purchase
Subject to factory lead times
The Model 7C has a 1.025" probe and all the all the features and benefits of the Stroke to GO™ cylinder position sensor product line.
Requires Quote
Available for Purchase
Subject to factory lead times
The Model 7D has a 1.25" probe and all the all the features and benefits of the Stroke to GO™ cylinder position sensor product line.
Requires Quote
Available for Purchase
Subject to factory lead times
The Model 7E has a 2.062" probe and all the all the features and benefits of the Stroke to GO™ cylinder position sensor product line.
Requires Quote
Available for Purchase
Subject to factory lead times
The Model 7F has a 2.062" probe and all the all the features and benefits of the Stroke to GO™ cylinder position sensor product line.
Requires Quote
Available for Purchase
Subject to factory lead times
The GO™ Switch Model 7G leverless limit switche offers unique options such as hermetic seal and Double Pole Double Throw (DPDT) contact arrangements.
Requires Quote
Available for Purchase
Subject to factory lead times
The GO™ Switch Model 7H leverless limit switch differs from the 7G in that it has no conduit hub. Like the 7G, its solid stainless steel construction and global certifications make it the ideal choice for a variety of applications.
Requires Quote
Available for Purchase
Subject to factory lead times
Model 7I is the largest of all GO Switches and offers a longer thread to allow for end of travel indication in large hydraulic or pneumatic cylinders.
Requires Quote
Available for Purchase
Subject to factory lead times
FAQS
- A valve positioner is a device mounted on an actuator that receives a control signal (typically 4–20 mA or a digital command) and precisely adjusts the actuator's position so the valve matches the signal. You need a positioner whenever the valve must operate in modulating service — meaning it needs to hold intermediate positions between fully open and fully closed to regulate flow, pressure, or temperature. Without a positioner, a pneumatic actuator only provides full open or full close. The positioner continuously compares the control signal to the valve's actual position via a mechanical or electronic feedback linkage, and adjusts the air supply to the actuator to eliminate any error. Positioners also overcome friction, packing drag, and unbalanced forces that would otherwise cause the valve to deviate from the commanded position. For on/off valve service where the valve only needs to be fully open or fully closed, a positioner is not required — a solenoid valve alone is sufficient to shift the actuator.
- A pneumatic positioner receives a pneumatic input signal (typically 3–15 psi) and uses a mechanical nozzle-flapper or force-balance mechanism to control the air pressure sent to the actuator. It is simple, reliable, and does not require electrical power at the valve, making it suitable for hazardous areas and installations without electrical infrastructure. A digital (smart) valve positioner receives an electrical input signal (4–20 mA) and uses a microprocessor with electronic feedback to control actuator position. Digital positioners offer significantly better accuracy, faster response, auto-calibration, and built-in diagnostics — they can report valve position, travel deviation, friction trends, and actuator health data back to the control system via HART, PROFIBUS, or Foundation Fieldbus protocols. This diagnostic capability enables predictive maintenance by identifying developing problems before they cause a process upset. For new installations, digital positioners are the standard choice due to their precision and diagnostic value. Pneumatic positioners remain a practical option for retrofits or locations where electrical power is not available.
- A limit switch is an electromechanical or proximity-based device mounted on a valve actuator that provides a discrete (on/off) electrical signal to the control system when the valve reaches a specific position — typically fully open, fully closed, or both. The primary purpose is position feedback — the PLC or DCS receives confirmation that the valve has actually reached its commanded position, which is essential for process sequencing, safety interlocks, and alarm generation. Without limit switches, the control system assumes the valve has moved based on the command sent, but has no confirmation that the valve actually arrived. Limit switches are available with mechanical (cam-operated) contacts or high-performance proximity (inductive) sensing elements. Many industrial limit switch enclosures include visual position indicators — colored domes that show red for closed and green for open — providing local visual confirmation for operators and maintenance personnel. Explosion-proof enclosures are available for installation in hazardous classified areas.
- Mechanical limit switches use a physical cam on the actuator shaft to depress a plunger or lever that opens or closes a set of electrical contacts. They are proven, widely used, and provide galvanically isolated dry contacts that are compatible with virtually any control system input. However, the mechanical contact is a wear point — over millions of cycles, contact surfaces degrade, and the cam mechanism can require adjustment. Proximity (inductive) limit switches detect the position of a metal target on the actuator shaft without physical contact. Because there is no mechanical wear, proximity switches offer longer service life in high-cycle applications and faster response times. They are solid-state devices, so they are more resistant to vibration and shock than mechanical contacts. The tradeoff is that proximity switches require a power supply and produce a sourcing or sinking transistor output rather than a dry contact, which must be compatible with the PLC input type. For high-cycle, high-reliability applications, proximity switches are the better long-term investment. For general-purpose applications with lower cycle counts, mechanical switches are cost-effective and universally compatible.
- Yes, and in many applications they should be. A positioner and limit switches serve different functions and complement each other. The positioner provides continuous, proportional position control — it modulates the valve to match a 4–20 mA control signal and is essential for throttling service. Limit switches provide discrete (on/off) position confirmation at specific positions — typically fully open and fully closed. Using both gives the control system the best of both worlds: the positioner handles precise flow control during normal operation, while the limit switches provide definitive confirmation when the valve reaches its end-of-travel positions. This is particularly important for safety interlocks where a binary confirmation that the valve is fully closed (or fully open) is required before a process step can proceed. Both devices mount on the actuator using standard NAMUR mounting interfaces, and modern digital positioners often include integrated limit switch functionality that can send discrete position signals alongside the continuous position feedback, potentially eliminating the need for a separate limit switch box in some applications.