Kromschroder Air pressure switch DL11K-3 84444826

The Kromschroder DL11K-3 air pressure switch (SKU 84444826) monitors overpressure, vacuum, and pressure drop in boilers and ventilation systems. It operates within a pressure range of 1–11 mbar and is designed for air or flue gas media. The switch features a tempered LSR diaphragm system, a glass fibre reinforced PBT plastic housing, and screw terminal electrical connections. It meets EN 13611 and EN 1854 standards, with a designed lifetime of 10 years. The unit weighs 200 g and has a protection class of II.

When selecting a pressure switch of this type, verify the required pressure range, media compatibility (air or flue gas), and electrical connection method. Ensure the switch's setpoint can be adjusted to match the system's operating pressure. Mounting orientation and tube connection size must align with the existing installation. Compare the switch's safety class and standards compliance with the application's requirements.

Common failure modes include diaphragm rupture or leakage, leading to loss of pressure sensing. This may cause the burner to shut down or fail to start, or the ventilation system to operate incorrectly. Check for visible damage to the housing or diaphragm, and verify the switch's operation by applying pressure and testing continuity. Also inspect the electrical connections for corrosion or loose terminals.