Masoneilan 496-458 Proximity Switch and 496-257 Valve Position Limit Switch
The Masoneilan 496-458 Proximity Switch and 496-257 Valve Position Limit Switch are industrial valve monitoring instruments designed for accurate detection and indication of control valve positions.
- One Proximity Switch 496-458 Switch Configuration
- Single Pole Double Throw Contact Operation, 496-257
Need help applying this product? Our engineers can help select the right equipment and design a system around your requirements. Request a quote or discuss your application with us.
Need help choosing? Send us the part number or your operating data — talk to an engineer or see full specifications.
- Fast dispatchAustralia & worldwide
- Technical supportTalk to an engineer
- 1 YearWarranty
Product Overview
The Masoneilan 496-458 Proximity Switch and 496-257 Valve Position Limit Switch are industrial valve monitoring instruments designed for accurate detection and indication of control valve positions. Manufactured by Masoneilan, a Baker Hughes brand, these 496 Series instruments provide electrical switching signals for monitoring valve travel and actuator movement. The 496-458 uses non-contact inductive proximity sensing, while the 496-257 incorporates mechanical limit switches for discrete valve position indication in industrial process automation systems.
The 496-458 features an intrinsically safe proximity switch configuration for appropriately certified hazardous-area installations, while the 496-257 features two SPDT mechanical switches within an explosion-proof housing configuration. Both models support adjustable switching points and installation on compatible rotary and linear valve assemblies. They are suitable for oil and gas processing, chemical manufacturing, petroleum refining, power generation, water treatment, and industrial valve position monitoring.
Technical Specifications
|
Specification |
Value |
|---|---|
|
Product Name |
Valve Position Limit and Proximity Switch |
|
Manufacturer / Brand |
Masoneilan / Baker Hughes |
|
Model Number 1 |
496-458 |
|
Model Number 2 |
496-257 |
|
Product Series |
Masoneilan 496 |
|
Product Type |
Industrial Valve Position Switch |
|
Primary Function |
Valve Position Detection and Indication |
|
496-458 Switch Technology |
Inductive Proximity Detection |
|
496-257 Switch Technology |
Electromechanical Limit Switching |
|
496-458 Switch Configuration |
One Proximity Switch |
|
496-257 Switch Configuration |
Two SPDT Mechanical Switches |
|
496-458 Protection Type |
Intrinsically Safe |
|
496-257 Protection Type |
Explosion-Proof |
|
Switching Function |
Discrete Valve Position Indication |
|
Position Detection |
Adjustable Actuator Travel Switching Points |
|
Contact Operation, 496-257 |
Single Pole Double Throw |
|
Maximum Mechanical Contact Rating |
Up to 10 A at 300 V AC, Subject to Switch Rating |
|
DC Mechanical Contact Rating |
Up to 0.6 A at 24/30 V DC |
|
Proximity Sensor Electrical Rating |
Dependent on Certified Sensor and Interface |
|
Housing Material |
Anodised Aluminium |
|
Surface Treatment |
Epoxy-Painted Finish |
|
Environmental Protection |
Dust and Water Resistant |
|
Operating Temperature |
−50°C to +80°C, Series Rating; Configuration Dependent |
|
Valve Compatibility |
Compatible Linear and Rotary Control Valves |
|
Mounting Configuration |
Valve or Actuator Mounted |
|
Switch Adjustment |
Adjustable Cam and Actuation Mechanism |
|
Monitoring System Integration |
Compatible PLC and DCS Discrete Input Systems |
|
Associated Positioner Reference |
SVI2-21113111 |
|
Operating Application |
Industrial Valve Position Monitoring |
|
Condition |
New |
|
Warranty |
1 Year |
Key Features
Accurate industrial valve position detection
Non-contact inductive proximity sensing on 496-458
Dual SPDT mechanical limit switches on 496-257
Discrete electrical signals for valve position indication
Intrinsically safe 496-458 configuration
Explosion-proof 496-257 configuration
Adjustable switching points for valve travel monitoring
Durable epoxy-coated aluminium housing
Compatible with rotary and linear valve actuators
Reliable switching for industrial process automation
Non-contact detection reduces mechanical sensor wear
Supports valve open and closed position monitoring
Suitable for PLC and DCS monitoring systems
Resistant to vibration and industrial operating conditions
Compact construction for actuator-mounted installations
Suitable for industrial valve maintenance and replacement
Typical Applications
Industrial control valve position monitoring
Pneumatic actuator position indication
Oil and gas production and processing facilities
Chemical and petrochemical manufacturing plants
Petroleum refining installations
Power generation and utility systems
Water and wastewater treatment facilities
Rotary ball and butterfly valve monitoring
Linear control valve position detection
Industrial valve open and closed limit indication
Hazardous-area valve monitoring with approved equipment
PLC and DCS discrete signal monitoring
Industrial process automation and instrumentation
Valve maintenance and replacement applications
Shipping & Support
Fast dispatch – Australia & Worldwide Shipping
Technical assistance available
1-year warranty
// Your history
Recently viewed
How do I find the right part for my system?
Three options. Search by part number if you have the OEM code from Parker, Danfoss, Linde, Kawasaki, Kayaba or Grundfos — our search recognises both manufacturer codes and aftermarket cross-references. Browse by category if you know the component type (pumps, valves, cylinders, etc.). Or send a spec sheet to our engineering desk and we'll cross-reference against our 3,000+ SKU catalogue within one business day.
Can you help me size a pump or valve for my application?
Yes — sizing support is included with every order. Send us your operating pressure, flow rate, viscosity, drive speed and duty cycle, and our engineers will recommend a suitable component from our catalogue with full datasheets. We don't custom-build parts ourselves, but we can spec the right OEM component for almost any standard industrial application.
Can you cross-reference a discontinued part?
Yes — cross-referencing is one of the things we do most. Send us the original part number (even if the manufacturer has dropped it) and our engineering desk will identify a current equivalent or compatible alternative. Cross-reference lookups are free and typically come back within 4 business hours.