Selection Guide for Pressure

How to choose an Alicat pressure controller or transducer

Use the questions below can help you narrow down the many options Alicat has for pressure controllers and pressure transducers. Follow the links to the appropriate product page to learn more about your chosen model. Or contact our skilled applications engineers can help you build your perfect instrument. Call us at 888-290-6060 , email us direct  info@alicat.com ,

Does your application depend upon absolute, gauge or differential pressure?

  • To reference your application to atmospheric pressure:  Choose a pressure instrument with a gauge pressure range, normally indicated by “PSIG” in Alicat’s part numbering system. Alicat gauge pressure instruments are available in ranges from 0-2 inH2O(G) to 0-3000 psi(G), or other equivalent engineering units. Negative ranges also available to -15 psi(G).
  • To reference your application to vacuum:  Choose a pressure instrument with an absolute pressure range, indicated by “PSIA” in Alicat’s part numbering system. Alicat absolute pressure instruments available in ranges from 0-30 psi(A) to 0-3000 psi(G), or other equivalent engineering units. Reference to absolute pressure is an excellent way to stabilize the effects of stormy atmospheric conditions, in which barometric pressures can change rapidly.
  • If your application requires measurement of the difference between two pressures: Choose a pressure instrument with a differential pressure range, indicated by “PSID” in Alicat’s part numbering system. These instruments include two dead-ended pressure ports that lead to opposite sides of a differential pressure sensor. Alicat differential pressure instruments are available in ranges from 0-2 inH2O(D) to 0-150 psi(D), or other equivalent engineering units.

Do you want to measure or control your system pressures?

  • I only want to measure pressure:  Choose the P-Series pressure transducer. If your medium is a corrosive gas or liquid, we recommend our PS Series which includes 316L stainless steel construction.
  • I want to control pressure in a flowing process:  Choose the PC-Series single-valve pressure controller for flow-through processes.
    • To control pressures at points somewhat distant from the pressure controller: Choose the PC3 Series, which includes a remote sense port to monitor pressure at any point upstream or downstream of the controller. (Differential pressure controllers by nature use dual remote sense ports.)
    • To monitor your flow rates while controlling for pressure: Choose an MC-Series mass flow controller, which can control absolute pressure up to 160 psi(A).
    • Any of the above instruments can be configured for backpressure control or vacuum control.
  • I want to control pressure in a closed or dead-ended volume:  Choose the PCD-Series dual-valve pressure controller for closed volumes.
    • To control pressures in closed volumes somewhat distant from the pressure controller: Choose the PCD3 Series, includes a remote sense port to monitor pressure at any point upstream or downstream of the controller. (Differential pressure controllers by nature use dual remote sense ports.)
    • To monitor flow rates while controlling for pressure: choose an MCD-Series bidirectional mass flow controller, which can control your closed volume’s absolute pressure up to 160 psi(A).
    • Any of the above instruments can be configured for vacuum control.

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