Ma-Ter ETX5 (K0001280) pressure switch

A pressure switch of this type confirms that pressure or airflow in a burner system is within the permitted band and gives the burner control permission to continue the ignition sequence. As an air pressure switch, it proves that the fan is moving air through the combustion chamber during pre-purge and operation. As a gas pressure switch, it guards minimum and maximum gas pressure, ensuring safe fuel supply. The switch operates a set of contacts that close or open when the sensed pressure reaches a defined threshold, sending a signal to the burner control. Selection for such switches is based on the medium (air or gas), the switching range and differential, the connection type (thread or hose spigot), the electrical contact rating, and the approval class for the intended application. Typical failures include a torn diaphragm, a blocked impulse tube, or a drifted setpoint. These faults often manifest as lockouts that resemble ignition problems, making it important to check the pressure switch when troubleshooting repeated burner shutdowns. The article listed here is the Ma-Ter ETX5 (K0001280) pressure switch, catalogue number 700.214.015. As a pressure switch of this class, it is selected by matching its switching range, differential, and connection to the specific burner or boiler design. When replacing a unit, ensure the setpoint is correctly adjusted and the impulse line is clean and unobstructed.