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    Flow Controllers & Meters

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    MCQ–Series: High Pressure Gas Mass Flow Controllers

    MCQ-Series High Pressure Gas Mass Flow Controllers rapidly reach setpoints and maintain stable control of mass flow, volumetric flow, or pressure for operating pressures up to 320 PSIA.
    • Versatile & accurate. Real-time control of flows up to 320 PSIA with NIST-traceable accuracy to ±0.6% of reading or ±0.1% of full scale for 98+ gases and 20 custom-defined mixtures.
    • Fast control, multivariate data. Millisecond-response times immediately upon powering up, to control either mass flow, volumetric flow, or pressure and display instantaneous flow, pressure, and temperature readings, in your choice of engineering units.
    • Easy integration. Custom process ports and electrical connectors, and your choice of EtherNet/IP, EtherCAT, DeviceNet, Profibus, PROFINET, Modbus (RTU and TCP/IP), or serial communications for easy integration into your industrial process.

    Request a quote

    Accessories included with purchase

    Device specs and customization options

    Quick Specs
    MCQ-Series performance (most products)
    • Available full scale ranges: 10 SCCM to 3000 SLPM
    • Steady state control range: 0.5% – 100% of full scale
    • Standard accuracy calibration, NIST–traceable: ±0.6% of reading or ±0.1% of full scale, whichever is greater
    • Repeatability: ±0.1% of full scale
    • Typical control response time: as low as 100 ms
    • Warm-up time: <1 s
    MCQ-Series operating conditions
    • Compatible gases: 98 pre–loaded selectable gas calibrations; additional mixtures definable with COMPOSER™
    • Operating temperature: –10°C to +60°C
    • Full scale operating pressure: 320 PSIA
    • Max differential pressure: 75 PSID
    • Proof pressure: 400 PSIA
    • User selectable reference conditions (defaults): 25°C & 1 ATM (STP) and 0°C & 1 ATM (NTP)
    See the full gas list here
    Device Ranges & Full Specs

    Alicat offers high pressure controllers with custom flow ranges from 10 SCCM full scale to 3000 SLPM full scale, each with a control range of 0.5% to 100% of full scale. Custom devices are ranged to best meet your specific application needs for full scale flow rate and operating range.

    Devices are custom ranged from 10 SCCM full scale to 3,000 SLPM full scale with controllable ranges of 0.5% to 100% of full scale.

    For a comprehensive device guide, read the mass flow controller operating manual.

    Device Features
    Included with each device
    • Multi-variable process measurements: Simultaneously measure mass flow, volumetric flow, gas pressure, and gas temperature.
    • User changeable units of measurement: Change the unit of measurement for pressure, flow, or temperature from our extensive list of engineering units.
    • Gas selectability: Select your process gas from any of the 98+ preloaded NIST-traceable gas calibrations in our gas list.
    • Gas Select COMPOSER™: Define 20 custom gas mixtures of up to 5 constituent gases using our Gas Select Composer™ firmware.
    • Monochrome backlit LCD with integrated touchpad: Easily read measurements using the backlit display and control configurations with the user-friendly integrated touchpad.
    • User adjustable setpoint ramping & limits: Configurable ramp rates allow the process variable to be controlled as fast or as slow as desired, and configurable setpoint limits protect processes from inadvertent setpoint changes.
    • User adjustable standard temperature and pressure (STP) conditions: Quickly change reference conditions without need for recalibration.
    • Valve close override and valve open override: Utilize alarms to quickly vent your system or stop all flow as needed.
    Request at time of purchase | Free
    • Optional integrated totalizers & batch control: Totalize mass flow every 1 ms for precise tracking of total flow over time and use batch control to dispense precise volumes.
    Request at time of purchase | Additional cost
    • Optional integrated potentiometer control: Use the integrated potentiometer to adjust setpoints with the simple turn of a knob.
    Device Customization Options
    Build and performance options
    • Communication protocols: Analog, RS–232, RS–485, DeviceNet, EtherCAT, EtherNet/IP, Modbus RTU or TCP/IP, PROFIBUS, PROFINET
    • Displays: Backlit monochrome or color; integrated or panel–mount
    • Process connections: NPT, SAE, AN, BSPP/G, compression, VCR, or VCO fittings
    • Elastomers: Viton, FFKM, EPDM, Silicone
    • Calibration: Custom calibration points
    Visit the device customization page
    Valve options & PID tuning

    Your mass flow controller may be customized with one of the following valving options to ensure optimal performance under your expected process conditions.

    • MCQ: small proportional control valve for flow ranges of 20 SLPM and below
    • MCQ with PCA designation: high-performance proportional control valve used for higher supply pressures
    • MCH: hammerhead configuration, which pairs two small valves working side-by-side as one valve
    • MCR: nearly frictionless large Rolamite proportional valve for flow rates of 50 SLPM and above

    Custom PID valve tuning ensures maximum performance for your specific process conditions.

    Learn about valve sizing and PID tuning options
    Optional Accessories
    Accessories | Sold separately
    • Process port fittings and filters
    • Power supplies
    • Communications cables and conversion cables
    • BB3 and BB9 multi-drop breakout boxes
    Visit the accessories page

    Not exactly what you’re looking for?

    Contact an applications engineer

    Learn about diverse flow control applications in our knowledge base
    Mass Flow Controller

    Mass Flow Controllers from Alicat

    Learn More
    BrochureManualMCQ-Series high flow device specsMCQ-Series mid flow device specs
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