228A Baratron® Differential Capacitance Manometer
(0.2 - 1000 Torr) with 2 Trip Points and ±15VDC or +24VDC Input Power

photo - 228A Baratron Differential Capacitance Manometer with Trip Points

The 228A Differential Baratron® is a general-purpose differential capacitance manometer is available in full-scale measurement ranges from 0.2 to 1000 Torr, two trip relays, and can be configured with a wide variety of fittings, input/output signals, and electrical connectors. It is mounted in a rugged industrial-grade housing that minimizes external RF/EM intereference on the electronics.

Features & Benefits:

  • Differential measurement ranges from 1000 to 0.2 Torr for accurate, repeatable measurement of very small pressure drops and flow rates
  • Three different analog output signals for unidirectional or bidirectional calibrations
  • Two independently-adjustable trip relays to control external equipment
  • Pressure measurement is not affected by gas composition - no gas-specific correction factors are needed
  • Fully-welded Inconel® sensor resists corrosion


  • Air and gas flow measurements for filters and analytical systems,
  • Downstream pressure control in thin film processing systems,
  • Automated leak testing systems.

Incoloy® and Iconel® are registered trademarks of Inco Alloys International.
Conflat® is a registered trademark of Varian Associates Inc.
VCR® is a registered trademark of Swagelok® Company.

List pricing is available for registered users from the USA under "Configurations" (below). Register/log in here.


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Part NumberFullScale Range & AccuracyCalibrationFittingInput VoltageOutput SignalMounting BracketPriceQTY
228A11TBBBBFB3C0AA10 Torr
0.50% Full Scale
Bidirectional1/4 inch OD tube both ends±15VDC0 - 5VDCNoneQuote Only
228A51WCBCBFB5C1AB50 inches H2O
0.50% Full Scale
Bidirectional4 male VCR® both ends+24VDC0 - 1VDC223B-compatibleQuote Only
228A22MGABBSU2C200200 mbar
0.30% reading
UnidirectionalKF16 measurement, 1/4 inch OD tube reference±15VDC0 - 10VDCSlottedQuote Only
228A12KBGBGFB7C1BB100 kPa
0.50% Full Scale
Bidirectional3/16 inch OD tube both ends+24VDC0 - 5VDC223B-compatibleQuote Only

Need help?

Contact an Applications Specialist by sending an email to MKS Instruments, or call 978-645-5500.