The A20 Series (2 inch/51 mm dial) above ground Swichgage instruments are diaphragm-actuated, pressure-indicating gauges with built-in low and high electrical switches for tripping alarms and/or shutdown devices. These rugged, built-to-last 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. Ranges above 30 psi (207 kPa) [2 bar] are sealed from the external environment (except PE Series).
Accuracy and protection from moderate overpressure is assured by a unique, unitised diaphragm chamber. A built-in pulsation dampener helps eliminate pointer flutter and is removable for cleaning.