LDU11.323A17 Siemens Gas Valve CHECK

Overview

The Siemens LDU11.323A17 is an automatic gas valve proving system designed to ensure the safety and integrity of combustion systems by checking for leakages in gas shutoff valves. It operates on a two-stage pressure proving principle, verifying both the mains-side and burner-side valves before burner startup or immediately following a controlled shutdown. If an inadmissible leak is detected, the system initiates a lockout and prevents the burner from firing, providing critical protection for industrial and commercial gas burners and appliances.

Features

• Automatic two-stage pressure proving principle for comprehensive leak detection
• Self-checking mechanism that prevents burner startup upon detection of inadmissible leakage
• Integrated program indicator that identifies the progress of the test and the specific location of faults
• Lockout reset button with a visual fault signal lamp and remote reset capability
• Synchronous motor-driven sequence switch for precise timing and reliable operation
• Durable, impact-proof, and heat-resistant plastic housing designed for industrial environments
• Global compliance with standards such as EN 1643 and CE approval

Specifications

• Model: LDU11.323A17
• Mains Voltage: AC 100 V to 110 V (+10% / -15%)
• Mains Frequency: 50 to 60 Hz
• Power Consumption: Approximately 3.5 VA during test, 2.5 VA during operation
• Timing (t3): 2.5 seconds (filling the test space)
• Timing (t4): 2.5 seconds (evacuating the test space)
• Internal Fuse: T6.3H250V
• Degree of Protection: IP40 (when mounted)
• Operating Temperature: -20 C to +60 C
• Weight: Approximately 1000 g

Applications

• Supervision of shutoff valves in industrial and commercial gas burners
• Safety monitoring for gas-fired appliances in HVAC and boiler systems
• Suitable for systems with or without a vent pipe to the atmosphere
• Integration into combustion plants requiring high safety standards according to EN 161 and EN 1643
• Used in conjunction with external pressure switches for monitoring gas or air pressures in gas trains