The Type 220DA Baratron® General Purpose Absolute Manometer offers a reliable, accurate, inexpensive solution to measuring low absolute pressures. Operating on the variable capacitance technique, the 220DA all-metal sensor contains a tensioned metal diaphragm, one side of which is exposed to the gas whose pressure is to be measured (Px side). The other side (reference, or Pr, side) is sealed at a high vacuum reference so absolute pressure is measured. The diaphragm deflects with changing absolute pressure, causing a capacitance change between the diaphragm and the adjacent electrode assembly. The capacitance change generates an AC voltage which is amplified, demodulated, and converted into a high level DC voltage output, linear with pressure, and calibrated against a pressure standard. The Type 220DA sensor is temperature controlled at 45°C for enhanced zero and span stability. All components are housed in a rugged, NEMA 1 enclosure for protection when used in harsh environments. Two outputs, 0-10 VDC and 4-20 mA, are provided for interfacing with common process controllers.