Kromschroder Air pressure switch DL2EH-1 84444100

The Kromschroder DL2EH-1 air pressure switch (SKU 84444100) is a safety-critical device designed to monitor positive, negative, or differential pressure of non-aggressive gases, air, or flue gases. It features a diaphragm sensing element made of NBR and a microswitch conforming to EN 61058-1. The housing is constructed from glass fibre reinforced PBT plastic with low gas release, and the unit is silicone-free. The pressure range is 0.45 to 2 mbar, and it operates with a designed lifetime of 10 years under specified conditions. Electrical connection is via AMP plugs, and the weight is 150 g. The cover screw torque is 50 Ncm, and the strain relief facility torque is 60 Ncm. It meets safety class 2 and is tested and produced under surveillance according to relevant directives and standards.

When selecting a replacement pressure switch of this type, verify the required pressure range, electrical connection type (e.g., AMP plugs), and mounting configuration. Ensure the switch is suitable for the medium (non-aggressive gases, air, or flue gas) and that the ambient and medium temperatures are within the specified limits. Check the electrical ratings and safety approvals to match the system requirements. Installation should follow the manufacturer's instructions, including proper torque for cover screws and strain relief.

Common failure modes for diaphragm-based pressure switches include diaphragm rupture or leakage, leading to loss of pressure sensing or false triggering. Microswitch contacts may wear or stick, causing intermittent or continuous signals. Symptoms on equipment may include burner lockout, failure to start, or erratic operation. Check for physical damage, verify pressure setpoint with a manometer, and test electrical continuity of the switch.