• Type
    Pressure Transducer
  • Sensor Type
    Dual-Range Capacitance Manometer
  • Measurement Type
  • Sensor Temperature
    Controlled to 45°C
  • Full Scale Pressure Ranges
    10, 100, 1000 Torr
  • Accuracy
    0.12% of Reading
  • Resolution
    0.001% of Full Scale
  • Analog Output
    0 to 10 VDC into > 10K Ω load
    Second Output: 0-10 VDC into > 10K Ω load over lower range
  • Analog Connector
    15-pin D-subminiture
  • Zero Temperature Coefficient
    0.002% of Full Scale/°C
  • Span Temperature Coefficient
    0.02% of Reading/°C
  • Operating Temperature Range
    15° to 40°C
  • Volume
    6.3 cc
  • Warm-up Time
    2 hours
  • Overpressure Limit
    45 psia (310 kPa)
  • Materials Exposed to Process Gases
  • Power Requirements
    ±15 VDC ±5% @ 0.40 Amps (max.)
  • Trip Point Level Signal
    0.01 to 10 VDC for each trip point (first output only)
  • Relay Contact Ratings
    SPDT, 1 Amp @ 30 VDC or 0.5 Amp @ 30 VAC resistive
  • 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.

Internally Heated to 45°C

These capacitance manometers are temperature controlled to 45°C 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.

The pressure sensor is located inside a 45°C constant temperature oven for improved pressure measurement accuracy.

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.

All-Inconel® Wetted Surfaces

These pressure transducers feature all Inconel® construction of the pressure sensor allowing it to operate without damage in virtually any chemical environment, including exposure to halogens, deionized water and steam, and ozone.

Dual Range Analog Outputs

Dual range manometers provide accurate, reliable, and repeatable pressure measurements for multi-step processes. The first 0 to 10 VDC analog output is proportional to the full scale absolute pressure. A second 0 to 10 VDC analog output is proportional to 1/2, 1/5, or 1/10 of the full scale range. The lower pressure limitation of system A/D resolution is now minimized with higher output signal levels.

Two Adjustable Process Trip Point Relays

These absolute capacitance manometers features two user adjustable process trip point relays, each with an adjustment range from 0.1% to 100% of Full Scale or voltage equivalent 0.01 to 10 VDC. Dual color LEDs indicate relay status. Typical relay uses include pump cross-over and valve activation.

15-pin "D" Type Pin-Outs

Pin Description
1 Trip Point-A V-level
2 First Pressure Output
3 Trip Point-A N.C.
4 Trip Point-A N.O.
5 Power Common
6 -15 VDC
7 +15 VDC
8 Trip Point-A Com
9 Trip Point-B N.O.
10 Trip Point-B N.C.
11 Trip Point-B Com
12 Pressure Return
13 Trip Point-B V-Level
14 Second Pressure Output
15 Chassis Ground

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