Compare Description Drawings, CAD & Specs Availability Price
Absolute Pressure Transducer, 50 psia, 4 VCR Female, 0-10 VDC, DB9
15 Weeks
15 Weeks

Configuration Options

r740c/r750c baratron 10-3000 psig capacitance manometer with trip relays R750D Absolute Capacitance Manometer, High-Pressure, Trip Relays, 10-3000 PSIG


  • Type
    Pressure Transducer
  • Measurement Type
  • Full Scale Pressure Ranges
    10 Torr (13 mbar) to 3000 PSI (204 bar)
  • Accuracy
    ±1% of Reading
  • Resolution
    ±0.01% of Full Scale
  • Repeatability
    ±0.1% of Reading
  • Analog Output
    0-10 VDC into >10 k Ω load
  • Electrical Connector
    15-pin D-sub
  • Zero Temperature Coefficient
    0.02% of Full Scale/°C
  • Span Temperature Coefficient
    0.04% of Reading/°C
  • Volume
    4.7 cc
  • Overpressure Limit
    45 PSI or 2x Full Scale (whichever is greater)
  • Burst Pressure
    Full Scale ranges of 1000 PSI or less: 100 PSI or 10x FS (whichever is greater)
    Full Scale ranges of more than 1000 PSI: 5x Full Scale
  • Power Requirements
    ±15VDC (± 5%) @ 35 mA (max)
  • Response Time
    20 msec
  • Relay Specifications
    2 independently-adjusted DPDT contacts adjustable between 0.5% and 100% of FS. UL listed and rated at 1.0 amps @ 30 VDC or 0.3 amps @ 30 VAC.
  • Weight
    1.0 lbs (0.4 kg)
  • Compliance
    Compliant with EMC Directive 2004/108/EC
    Compliant with Directive 2002-95-EC


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 Wetted Surfaces

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.

0 to 10 VDC Proportional Analog Output

These Baratron® capacitance manometers feature a high-level 0-10 VDC analog output signal that is linear with pressure. This analog output can be interfaced with an MKS pressure controller, an MKS power supply/display instrument, or any instrument that meets these requirements.

Two Adjustable Process Trip Point Relays

These pressure transducers feature two user adjustable process trip point relays, each with an adjustment range from 0.5% to 100% of Full Scale or voltage equivalent 0.05 to 10 VDC. The relays are UL listed and rated at 1.0 amps @ 30 VDC or 0.3 amps @ 30 VAC.  The trip points are factory set at 55% of full scale with relay A energizing below that level and relay B energizing above the trip point.

15-pin Type "D" Pin-Outs

Pin Description
1 Relay Contact A, N.O.
2 Pressure Output
3 Reserved
4 Reserved
5 Power Return
6 -15 VDC
7 +15 VDC
8 Relay Contact A, N.C.
9 Relay Contact B, N.C.
10 Trip Point A, Setting
11 Trip Point B, Setting
12 Pressure Return
13 Relay contact B, N.O.
14 Relay Contact B, Common
15 Relay contact A, Common

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