FW Murphy 5702525 A20P-400 Differential Pressure Gauge, 400 PSI

The A20 Series (2 inch / 51 mm dial) Swichgage instruments are diaphragm-actuated, pressure-indicating gages with built-in electrical switches for tripping alarms and shut-down devices. These rugged instruments are face sealed from the environment by the unique combination of a polycarbonate case and lens, a polished stainless steel bezel and O-ring seals. These gages are sealed from the external environment. Accuracy and protection from moderate overpressure is assured by a unique, unitized diaphragm chamber. A built-in pulsation dampener helps eliminate pointer flutter and is removable for cleaning. Contacts have self-cleaning motion to ensure electrical continuity.