The Siemens LDU11.323A27 is a Valve Proving System designed to ensure safe operation of automatic shutoff valves in gas burners and gas-fired appliances. It detects inadmissible leakage and prevents burner startup in case of faults. This system is ideal for industrial combustion applications requiring high safety standards.

Technical Specifications

• Model Number: LDU11.323A27

• Type: Valve Proving System

• Supply Voltage: AC 220-240 V

• Mains Frequency: 50-60 Hz ±6 %

• Operating Voltage: AC 220-240 V (-15% / +10%)

Leakage Detection Time

• Test Phase 1 (t3): 2.5 seconds (Filling the test space)

• Test Phase 2 (t4): 2.5 seconds (Evacuating the test space)

Power Consumption

• During test: Approx. AC 3.5 VA

• During operation: Approx. AC 2.5 VA

Fuse Details

• Unit Fuse (built-in): T6.3H250V (to DIN EN 60127)

• Primary Fuse (external): Max. 10 A (slow)

Temperature Ranges

• Operating Temperature Range: -20 to +60 °C

• Storage Temperature Range: -40 to +70 °C