Kromschroder Air pressure switch DL10A-3Z 84447477

The Kromschroder DL10A-3Z is a diaphragm pressure switch designed to regulate positive, negative, or differential air and flue gas pressures. It features a glass fibre reinforced PBT plastic housing with low gas release and a tempered LSR diaphragm system. The switch includes a microswitch with change-over contact to EN 61058-1 and is approved under CE-0085AP0466, complying with EN 13611:2015+AC:2016 and EN 1854:2010. It operates within a temperature range of -20 to +80°C and weighs 0.321 kg. The cover screw and strain relief facility require a torque of 65 Ncm.

When selecting a pressure switch of this type, ensure the pressure range, switching differential, and electrical ratings match the application. Verify the medium compatibility (air or flue gas, non-flammable, non-aggressive) and temperature limits. The switch must be mounted in the correct orientation, typically with the diaphragm in a vertical or specified position, and the pressure connections must be properly sealed. Compare the electrical connection type (e.g., change-over contact) and the required torque for cover and strain relief to the original part.

Common failure modes for diaphragm pressure switches include diaphragm rupture or leakage, leading to loss of pressure sensing and improper burner operation. Symptoms may include the burner failing to start, intermittent shutdowns, or the system not detecting pressure changes. Check for visible damage to the diaphragm, verify the switch actuation with a manometer, and ensure the pressure connections are not blocked or leaking.