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ℹ️ Additional Information
| Condition |
USED/EXCELLENT CONDITION |
|---|---|
| Manufacturer |
DUNGS |
| Product Code |
100.199.04964 |
📦 Guarantee Terms
🗂️ Product Files
🖹 Description
Differential pressure switches for air, flue and exhaust gases
This is a gas pressure switch — used mainly for safety and monitoring in gas systems.
The gas pressure switch model LGW3A4 by DUNGS is a critical safety and monitoring device used in gas systems to ensure proper operating conditions and prevent hazardous situations. It is widely applied in combustion systems where reliable pressure monitoring is essential for safe operation.
What It Is
The LGW3A4 is a gas pressure switch designed to monitor the pressure of gas within a pipeline. It is an electro-mechanical device that activates or deactivates an electrical contact when the gas pressure reaches a predefined threshold.
What It Does
This device continuously monitors gas pressure and:
- Detects whether pressure is within safe limits
- Activates or deactivates electrical contacts when thresholds are crossed
- Sends signals to burner control systems or safety circuits
It plays a vital role in ensuring that gas-powered equipment operates only under safe conditions.
Design and Components
The LGW3A4 features a compact and robust design suitable for industrial use:
- Blue adjustment dial (top): Used to set the pressure switching point
- Plastic housing: Contains the internal diaphragm and microswitch
- Threaded connection port: Connects directly to the gas line
- Internal microswitch: Activates electrical contacts based on pressure
How It Works
The operation is simple and reliable:
- Gas pressure enters the device through the connection port
- The pressure acts on an internal diaphragm
- When the pressure reaches the setpoint, the microswitch activates
- An electrical signal is sent to the control system
Depending on configuration, the switch can respond to either low or high pressure conditions.
Typical Applications
Gas pressure switches like the LGW3A4 are commonly used in:
- Gas burners
- Boilers and heating systems
- Industrial furnaces
- Combustion control systems
They are essential for:
- Safety interlocks
- Low and high gas pressure detection
- Burner enable/disable control
Example Scenario
Setpoint: 20 mbar
| Pressure | Result |
| 10 mbar | System disabled (pressure too low) |
| 20 mbar | Switch activates |
| 30 mbar | System allowed to operate |
Why It’s Critical
This device ensures:
- Safe and stable gas supply
- Prevention of dangerous operating conditions
- Compliance with safety standards in combustion systems
In Simple Terms
Think of the LGW3A4 as a “gas pressure safety switch” that allows or blocks system operation based on pressure conditions.
Difference from Other Pressure Switches
- Differential pressure switch → monitors pressure difference (e.g., filters)
- Gas pressure switch (this device) → monitors absolute gas pressure for safety
Role in a System
Gas line → Pressure switch → Burner control system → Safe operation
Big Picture
The LGW3A4 belongs to the safety layer of industrial systems, ensuring that equipment operates only when conditions are safe.
