Selection Guide for Pressure

How to choose an Alicat pressure controller or transducer

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. Then get in touch with one of our skilled applications engineers who can help you build your perfect instrument. Call us at 888-290-6060 or send your inquiry to info@alicat.com.

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

  • To reference your application to atmospheric pressure, you will want to choose a pressure instrument with a gauge pressure range, normally indicated by “PSIG” in Alicat’s part numbering system. Alicat gauge pressure instruments are generally available in ranges from 0-2 inH2O(G) to 0-3000 psi(G), or other equivalent engineering units. Negative ranges are also available to -15 psi(G).
  • To reference your application to vacuum, you will want to choose a pressure instrument with an absolute pressure range, normally indicated by “PSIA” in Alicat’s part numbering system. Alicat absolute pressure instruments are generally 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, you will want to choose a pressure instrument with a differential pressure range, normally 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 generally 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?

  • If you only want to measure pressure, you will need a P-Series pressure transducer. If your medium is a corrosive gas or liquid, we recommend our PS Series, which includes 316L stainless steel construction.
  • If you want to control pressure in a flowing process, you will need a 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.)
    • If you want 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.
  • If you want to control pressure in a closed or dead-ended volume, you will need a 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, 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.)
    • If you want to monitor your 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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