Ma-Ter Pressure switch ETF51C7100

The Ma-Ter ETF51C7100 is a pressure switch with a membrane sensing element, designed to monitor and control pressure within a range of 0 to 4 bar. It features a 1/4" connection thread and is manufactured in Italy. This component is used to signal when pressure thresholds are reached, enabling or disabling connected equipment in systems such as boilers and HVAC.

When selecting a replacement pressure switch of this type, verify the switching range, connection thread size, and electrical rating to match the original. The medium (air or gas) and the specific application (e.g., air proving or gas pressure guarding) must be considered. Ensure the setpoint and differential are compatible with the system's requirements.

Common failures include a torn diaphragm, blocked impulse tube, or drifted setpoint, which can cause burner lockouts that mimic ignition problems. Check the diaphragm, impulse line, and pressure settings when such symptoms occur.