Kromschroder Air pressure switch DL4E-1 84444180

The Kromschroder DL4E-1 is a mechanical diaphragm pressure switch designed to monitor and regulate positive, negative, or differential air and flue gas pressures. It features a tempered LSR diaphragm and a micro switch compliant with EN 61058-1. The switch has an adjusting range of 0.5–4 mbar, a contact rating of 6(2)A at 250V, and is housed in glass fibre reinforced PBT plastic with low gas release. It operates within a temperature range of -20 to +80°C and has a designed lifetime of 10 years. The product is certified under CE-0085AP0466 and meets EN 1854:2010 standards.

When selecting a pressure switch of this type, ensure the pressure range, electrical rating, and connection type match the application. The switch can be used for positive, negative, or differential pressure, and the medium must be air or flue gas. Installation involves connecting the pressure lines and electrical plugs, and the cover screw and strain relief should be tightened to the specified torque of 65 Ncm.

Common failure modes include diaphragm rupture or leakage, leading to inaccurate pressure readings or failure to switch. This may cause the burner to shut down or fail to start. Check for visible damage to the diaphragm, proper sealing, and correct electrical continuity.