Ma-Ter Pressure switch ETF518

The Ma-Ter ETF518 is a single-pole pressure switch with a measuring range of 0-8 bar, type 010. It is used in burner and boiler safety circuits to confirm that air or gas pressure is within the permitted operating band, allowing the burner control box to proceed with the start sequence or maintain firing. This switch is suitable for liquids, air, gases, and other non-aggressive media, and is manufactured in Italy.

Parts of this type are selected by the medium (air or gas), the required switching range and differential, the connection size (thread or hose spigot), electrical contact rating, and the applicable approval class for the burner type. When replacing, ensure the new unit's setpoint range covers the required cut-in and cut-out pressures and that the differential is compatible with the system design. Mounting is typically on standard pipe rails or panels, with pressure setpoint adjusted via a screw mechanism.

Typical field failures include a torn diaphragm, a blocked impulse tube, or a drifted setpoint, all of which cause burner lockouts that may be mistaken for ignition problems. Check impulse line integrity and diaphragm condition before adjusting or replacing the switch.