switch
Key selector -Key Automation EGS101
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Key selector -Key Automation EGS101
The EGS101 is a gate/door opener key selector manufactured by KeyAutomation. It's designed for high-security residential and commercial properties and allows manual operation of automatic gates or doors using a physical key, according to KeyAutomation.A key selector for gates is a physical switch, often a key-operated switch, that allows manual operation of an automatic gate or door.
It's a security feature and backup system for situations where automated control is unavailable or undesirable.
TECHNICAL FEATURES
| Voltage | Vdc | Max 48 |
| Degree of protection | IP | 55 |
| Dimensions (L - D - H) | mm | 79 - 23 - 79 |
| Item | kg | 0,335 |
| Minimum operating temperature | °C | -20 |
| Max operating temperature | °C | +55 |
A key selector for door openers is a switch that allows you to operate an automated door or gate using a physical key, often as an alternative or backup to other access methods like remote controls or keypads.
These switches are commonly used in situations where you need to control access to a gate, garage door, or other automated barrier.
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Function:Key selectors are designed to activate the door or gate opener's motor by completing an electrical circuit when the key is turned.
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Mechanism:They typically involve a key cylinder that, when turned, activates a set of electrical contacts.
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Applications:They are used in various settings, including residential, commercial, and industrial applications, such as garage doors, gates, and automatic doors.
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Features:Some key selectors offer multiple functions, like automatic, lock, exit, and hold-open modes.
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Types:They can be found as jamb key switches for garage doors or as more sophisticated selector switches for automatic doors with multiple functions.
Mercury Level Switch
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Mercury Level Switch
A mercury level switch is a type of electrical switch that uses a small amount of liquid mercury to open or close an electrical circuit based on its position or the level of a liquid. Essentially, the mercury acts as a conductive bridge between electrical contacts. How it Works The core component of a mercury level switch is a sealed glass or metal capsule containing one or more electrical contacts and a small, free-moving drop of mercury. When the switch or the liquid it's monitoring changes its tilt or level:- Tilt Switches: Gravity pulls the mercury to the lowest point within the capsule. If the tilt is sufficient, the mercury will flow to connect two or more contacts, completing an electrical circuit. Tilting it in the opposite direction moves the mercury away, breaking the circuit.
- Float Switches: In liquid level applications, the mercury switch is often integrated with a float mechanism. As the liquid level rises or falls, the float moves, which in turn tilts the mercury switch, causing the mercury to connect or disconnect the contacts.
- Displacement Switches: Some designs use a "plunger" that dips into a pool of mercury, raising the mercury level to contact an electrode and complete the circuit.
- Thermostats: In older thermostats, they controlled heating and cooling systems.
- Sump Pumps: Used to automatically turn on the pump when water levels rise.
- Appliances: Found in washing machines (for lid switches and load balancing), chest freezers (for lid lights), and some gas appliances like ovens and water heaters (as flame sensors).
- Automotive Industry: Previously used for trunk lid lights, ride control, and anti-lock braking systems.
- Industrial Settings: Utilized in liquid level control and safety systems.
- Roll Sensing/Tip-over Warnings: For construction equipment or other vehicles operating on uneven terrain.
- Durability and Reliability: The sealed contacts prevent oxidation, leading to a long lifespan.
- Quiet Operation: No abrupt snapping of contacts.
- No Contact Erosion: Mercury's liquid nature prevents the wear and tear seen in mechanical contacts.
- Spark-Free: They don't produce sparks when making or breaking circuits, making them suitable for hazardous environments.
- Toxicity of Mercury: This is the primary and most significant disadvantage. Mercury is a highly toxic substance, posing serious environmental and health risks if released.
- Environmental Concerns: Improper disposal of mercury switches can lead to widespread contamination. Due to these concerns, the use of mercury switches has been largely phased out in many applications, especially in new products.
- Sensitivity to Gravity/Orientation: While an advantage for tilt sensing, it makes them unsuitable for portable or mobile devices where orientation changes or vibrations could cause false readings.
- Limited Functionality: Most mercury switches provide only a simple on/off function.
Micro Limit Switch
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Micro Limit Switch
A micro limit switch, often simply called a micro switch, is a type of electrical switch that's characterized by its small size and the precise, rapid action it takes when a minimal amount of force is applied to its actuator. It's designed to detect the presence or position of an object or the end of a mechanical movement. These switches are known for their:- High sensitivity: They require very little force to activate.
- Rapid response: The internal contacts "snap" open or closed very quickly, regardless of how slowly the actuator is pressed. This snap-action mechanism helps to reduce arcing and extends the switch's lifespan.
- Reliability: They are built to withstand millions of operations, making them durable for long-term use.
- Compact size: Their small footprint allows them to be used in applications where space is limited.
- Actuator: This is the external part that an object or mechanical component presses against. It can be a button, a lever (with or without a roller), a plunger, or other forms.
- Internal spring mechanism: This provides the "snap-action." When the actuator is pressed to a certain point (the "trip point"), the spring mechanism rapidly moves the contacts.
- Contacts: These are the electrical components that open or close the circuit. Micro switches usually have three terminals:
- Common (C): The input terminal.
- Normally Open (NO): This contact is open (no current flows) when the switch is unactivated and closes when the switch is actuated.
- Normally Closed (NC): This contact is closed (current flows) when the switch is unactivated and opens when the switch is actuated
- Household Appliances:
- Microwave ovens: To detect if the door is closed before operating.
- Washing machines: For door interlocks and water level detection.
- Refrigerators: To turn the light on/off when the door opens/closes.
- Printers: To detect paper jams or the position of paper.
- Automotive Industry:
- Car doors: To detect if a door is open or closed (e.g., for interior lights or security systems).
- Brake pedals: To activate brake lights.
- Seat belt mechanisms: To detect if a seat belt is fastened.
- Industrial Automation:
- Conveyor systems: To detect the presence of items or the end of travel for a belt.
- Robotic arms: For precise positioning and limit detection of movement.
- Machine safety guards: To ensure guards are correctly positioned before machinery operates.
- Elevators and hoists: To prevent over-travel and ensure proper door operation.
- Consumer Electronics:
- Computer mice and keyboards: For button clicks.
- Vending machines: For coin detection or jam detection.
- Medical Equipment:
- In various diagnostic tools and surgical instruments for precise control.
- Pin Plunger: A simple button-like plunger that is directly pressed.
- Roller Lever: Features a lever with a roller at the end, ideal for applications with sliding or rotating components.
- Hinge Lever: A simple lever arm that pivots to actuate the switch.
- Flexible Roller: Similar to a roller lever, but with a more flexible arm to accommodate irregular surfaces or wider ranges of motion.
- Spring Plunger: A plunger supported by a spring, allowing for a certain degree of "overtravel" beyond the actuation point without damaging the switch.
Sliding gate operator limit sensor – Magnetic mechanism
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Sliding gate operator limit sensor - Magnetic mechanism
A sliding gate operator limit sensor, often a limit switch, is a crucial component that signals the gate operator when the gate has reached its fully open or fully closed position, stopping the motor and preventing over-travel. These sensors ensure the gate stops at the correct positions, preventing damage to the gate and surrounding structure.
Here's a more detailed explanation:
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Function:Limit sensors, like limit switches, detect when the gate reaches its extreme open or closed positions.
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How it works:When the gate reaches the limit, the sensor sends a signal to the gate operator's control board, which then stops the motor.
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Importance:Without limit sensors, the gate might continue to move, potentially hitting the end posts or other obstructions, causing damage.
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Types:Common types include magnetic limit switches and photoelectric sensors (photo eyes).
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Magnetic Limit Switches:These utilize magnets placed on the gate and a magnetic sensor on the operator. When the magnet aligns with the sensor, it triggers the limit switch.
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Photoelectric Sensors (Photo Eyes):These use infrared beams to detect obstructions. When the beam is broken (e.g., by the gate), the sensor signals the operator to stop.
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Installation:Proper installation and adjustment of limit sensors are crucial for the reliable operation.
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Maintenance:Regular inspection and maintenance of limit sensors are recommended, as they can wear out or become misaligned over time.
