Compare Model Drawings, CAD & Specs Sensor Temperature Full Scale Range Fitting Type Electrical Connector Availability Price
aa02a baratron 0.1-1000 torr heated absolute capacitance manometer
80°C 0.1 Torr NW16 ISO-KF 15-pin D-sub male with screw locks
aa02a baratron 0.1-1000 torr heated absolute capacitance manometer
45°C 1000 Torr 8 VCR female 15-pin D-sub male with screw locks

Configuration Options

aa02a baratron 0.1-1000 torr heated absolute capacitance manometer AA02A Absolute Capacitance Manometer, 0.1-1000 Torr, 13.3 Pa-133.3 kPa


  • Type
    Baratron® Pressure Transducer
  • Sensor Type
    Standard or Reduced Tube Length
  • Measurement Type
  • Full Scale Pressure Ranges
    0.1, 0.25, 0.5, 1, 2, 10, 20, 100, 200, 500, & 1000 Torr (and metric equivalents)
  • Sensor Temperature
    45°, 80°, or 100°C
  • Fitting Type
    ½ inch O.D. tube standard, other types optional
  • Analog Output
    0 to 10 VDC into > 10 kΩ load
  • Electrical Connector
    15-pin D-subminiature
  • Accuracy
    45°C Models: 0.10% Reading for 1-1000 Torr, 0.12% Reading for < 1 Torr
    80° and 100°C Models: 0.20% Reading for 1-1000 Torr, 0.40% Reading for < 1 Torr
  • Warm-up Time
    2 hours for 1-1000 Torr models
    3 hours for < 1 Torr models
  • Time Constant
    <20 ms for ≥1 Torr
    <40 ms for <1 Torr
  • Zero Temperature Coefficient
    45°C Models: 0.002% Full Scale/°C for 1-1000 Torr, 0.005% Full Scale/°C for < 1 Torr
    80° and 100°C Models: 0.002% Full Scale/°C for 1-1000 Torr, 0.01% Full Scale/°C for < 1 Torr
  • Span Temperature Coefficient
    0.02% Reading/°C
  • Operating Temperature Range
    45°C Models: 15° to 40°C
    80° and 100°C Models: 15° to 50°C
  • Overpressure Limit
    45 psia
  • Volume
    6.3 cc (nominal – varies depending on fitting)
  • Materials Exposed to Process Gases
    Inconel and Incoloy nickel alloys
  • Power Requirements
    45°C Models: ±15 VDC (±5%) @ 0.40 amps or +24 VDC ±10% @ 11 W
    80° and 100°C Models: ±15 VDC (±5%) @ 0.60 amps or +24 VDC ±10% @ 22 W
  • Output Relays
    SPST contacts rated at 0.75 Amp @ 60 VDC or 60 VAC @ 20 (°C) room ambient temperature
  • Compliance


Baratron® Capacitance Manometer Technology

Capacitance manometers are electro-mechanical gauges that can measure both pressure and vacuum. The capacitance gauge translates a pressure-modulated movement in a thin diaphragm into an electrical signal proportional to the pressure. The pressure sensor is the thin diaphragm that is exposed to the pressure or vacuum being measured via the inlet tube. An electrode is mounted in the reference cavity behind the diaphragm. Pressure differences between the process and the reference cavity deflect the diaphragm slightly, changing the distance between it and the electrode. Variations in this distance produce variations in the capacitance between the diaphragm and the electrode creating an electrical signal that is proportional to the pressure change. Since differences in the capacitance signal are produced by physical changes within the manometer and not by changes in the gas properties, pressure measurements by the capacitance manometer are independent of the composition of the gas being measured.

Gas independent pressure measurement with a Baratron® capacitance manometer. Schematic shows the internal components and functional zones.

Percent of Reading Accuracy

Accuracy is specified as a percent of Reading, not Full Scale, as seen in some of the lower performance devices. Percent of Reading accuracy provides you with an even more accurate output signal in the lower scale of the pressure range, where it is needed most.

Absolute Pressure Measurement

These Baratron® pressure transducers are referenced to vacuum for absolute pressure measurement. Applications include: vacuum furnaces, freeze-drying of fruits and vegetables, gas lasers, automotive component testing, bottle coatings, and vacuum distillation.

Inconel® and Incoloy® Construction

These pressure transducers feature Inconel® and Incoloy® nickel alloy construction of the pressure sensor allowing it to operate without damage in virtually any chemical environment, including halogens, deionized water and steam, and ozone. The sensor is fully welded with no intermediate brazing or joining materials.

Internally Heated to 45°, 80°, or 100°C

These capacitance manometers are internally heated for improved accuracy. Unheated versions are exposed to ambient temperature variations which can degrade the sensor accuracy. These devices have the sensor enclosed in a volume that is maintained at a constant temperature above ambient. This solution improves the manometer’s accuracy and repeatability and lowers instrument drift by reducing or eliminating process contamination within the manometer. Heated manometers are recommended for applications that require maximum accuracy and repeatability, operate above ambient temperature and for those processes that employ hot gases.

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