Ma-Ter DR2 (800mbar) (DR7AB1AA080290) pressure switch

This article is a Ma‑Ter pressure switch, type DR2, with the designation including 800 mbar. The catalogue code is 700.214.016 and the manufacturer code is DR7AB1AA080290. Pressure switches of this class serve a safety‑proving function in burner and boiler systems. They confirm that pressure or airflow is within the permitted band and give the burner control permission to continue operation. An air pressure switch proves that the fan is moving air; a gas pressure switch guards minimum and maximum gas pressure. When selecting a replacement pressure switch, the engineer must match the medium (air or gas), the switching range and differential, the connection thread or hose spigot, the contact rating, and the applicable approval class. Typical failure modes include a torn diaphragm, a blocked impulse tube, or a drifted setpoint. These faults cause lockouts that are often mistaken for ignition problems. During replacement, verify that the impulse line is clear and correctly routed, and that the pressure tapping point is positioned in a region of stable pressure. The switch’s setpoint must be adjusted with a manometer to the value required by the burner specification. The electrical contacts should be rated for the control voltage and current in the existing circuit. No further compatibility, dimensions, or ratings are provided in the catalogue entry for this specific article; the engineer should consult the appliance manual or the manufacturer’s datasheet for exact selection criteria.