Kromschroder Air pressure switch DL3AG-3K2 84444454

The Kromschroder DL3AG-3K2 air pressure switch (SKU 84444454) monitors air and flue gas pressures in industrial and commercial systems. It has an adjusting range of 0.2–3 mbar and features a tempered LSR diaphragm. The switch includes gold-plated contacts, a green/red pilot lamp for 24 V supply, and a micro switch to EN 61058-1. It is safety class II to VDE 0106-1, with a connection thread of Rp 1/4 and screw terminals for electrical connection. The unit weighs 300 g, with cover screw and strain relief facility torque set at 65 Ncm.

When selecting a replacement pressure switch of this type, verify the adjusting range, connection thread, and electrical ratings (voltage, contact type) match the original. Ensure the switch is suitable for the medium (air or flue gas) and that the mounting orientation and pressure connections align with the system. Installation is straightforward, but torque settings for the cover screw and strain relief must be respected to maintain proper sealing and electrical safety.

Common failures include diaphragm rupture or leakage, leading to inaccurate pressure readings or failure to switch. Symptoms may include burner lockout, erratic operation, or no response to pressure changes. Check for physical damage, contamination, or loose electrical connections, and verify the switch operation against a known pressure source.