brooks instrumentmfcmass flow controllersemiconductor

Brooks Instrument — the low-flow gas mass flow controller specialist

SLA, GF, Quantim, Sho-Rate and Smart-DP — the reference catalogue for thermal MFCs, low-flow gas dosing and analytical instrument gas distribution.

TaglineUS specialist in low-flow gas mass flow controllers (MFCs) for semiconductors, analytical instruments, R&D and pharma — plus Coriolis (Quantim) and variable-area (Sho-Rate) lines.
Websitewww.brooksinstrument.com/en/products/flow-measurement-control
Technologies
thermal masscoriolisvariable areadifferential pressure
Product lines
SLA Series (Thermal mass flow controllers, gas)GF Series (Digital thermal MFCs, semiconductor)Quantim (Coriolis mass flow controllers, small line)Sho-Rate / Mite (Variable area / rotameters)Smart-DP (Differential pressure)

When to choose Brooks Instrument

When the duty is gas mass flow at low or very low flow rates (semiconductor process gas, analytical instrument carrier gas, R&D, pharmaceutical batch dosing), or when a closed-loop mass flow CONTROLLER (not just a meter) is required.

Brooks Instrument at a glance

Brooks Instrument is a US specialist (Hatfield, PA, founded 1946) focused on a part of the flow market the European process-instrumentation majors largely don't play in: closed-loop mass flow control of low-flow gases for semiconductor process tools, gas chromatographs / mass spectrometers, R&D reactors, fuel cell test rigs and pharmaceutical batch dosing.

A mass flow controller (MFC) is a different beast from a flow meter: it contains the sensor, a proportional control valve, and a PID loop on board, and accepts a setpoint over RS-232 / RS-485 / EtherCAT / DeviceNet / analog. Specify the wrong sensor architecture and your loop oscillates or has unacceptable settling time — this is what drives most of the Brooks vs. competitor selection.

Thermal mass — SLA, GF, MT

  • SLA5800 series — analog / digital thermal MFCs for clean and semi-corrosive gas, full-scale flow rates from 3 sccm up to 2500 slm. The high-volume general-purpose line.
  • GF Series (GF40, GF80, GF125) — high-performance digital MFCs for semiconductor wafer processing. Multi-gas / multi-range, EtherCAT, settling time < 1 second.
  • MT3809 series — variable-area mass flow meters and MFCs for analytical instruments.

Coriolis — Quantim

  • Quantim QMB / QMBM — small-line Coriolis mass flow meters and controllers, scaled for low-flow gas and liquid dosing (full-scale liquid from 0.5 g/h up to 100 kg/h, gas from 10 g/h up to 10 kg/h). Direct competition with Micro Motion CMFS and Promass A in the dosing / additive injection segment.

Quantim is the right choice over a thermal MFC when:

  • The gas composition is variable (Coriolis is gas-composition-independent on mass).
  • The duty is liquid (thermal MFCs are typically gas-only).
  • A higher accuracy class (±0.2% of reading vs. ±1% of full-scale typical for thermal) is required.

Variable area — Sho-Rate / Mite / GT

The Sho-Rate rotameter is a long-running variable-area meter for clean low-flow gas and liquid visual indication. Used everywhere from analytical purge gas to lab plumbing. Not a high-accuracy meter — ±2 to ±5% of full-scale — but very low-cost and self-powered.

When InstruSelect promotes Brooks Instrument

The selector ranks Brooks Instrument strongly when:

  • The duty is low-flow gas mass flow control (semiconductor, analytical, fuel cells, R&D reactors).
  • The duty is pharmaceutical batch dosing of gas reactants or carrier gases — Brooks has deeper pharma validation packages (3-A / 21 CFR Part 11 / IQ-OQ-PQ) than competitors in this segment.
  • A closed-loop controller is needed, not a stand-alone meter.

For higher-flow industrial gas measurement (compressed air, biogas, natural gas) the typical InstruSelect alternatives are E+H t-mass, ABB Sensyflow or Siemens SITRANS FUS for clamp-on. For larger-line liquid Coriolis dosing the alternatives are Micro Motion CMFS / Promass A rather than Quantim — Brooks Quantim is competitive specifically at the very-low-flow end (< 10 kg/h).

Datasheet sources

Curated from Brooks Instrument product datasheets and Application Notes available on brooksinstrument.com. Verify the live datasheet for any procurement decision.

Frequently Asked Questions

What is the difference between a mass flow controller and a mass flow meter?

A mass flow controller (MFC) integrates a flow sensor, a proportional valve, and a PID control loop in one device. You give it a flow setpoint and it drives the valve to hold that setpoint. A mass flow meter only measures — you would pair it with a separate control valve and host-side PID loop. For low-flow gas in semiconductor and analytical applications the MFC is the standard, because the valve, sensor and loop are tuned together at the factory.

When does a Quantim Coriolis beat an SLA thermal MFC?

Whenever (a) the gas composition can change during operation (thermal MFCs are calibrated for a specific gas — composition changes shift the calibration), (b) the duty is liquid rather than gas, or (c) accuracy better than ±1% of full-scale is required. The trade-off is cost and pressure drop — Quantim costs roughly 2-3× a comparable SLA, and the Coriolis sensor adds a small pressure drop.

Does Brooks support EtherCAT?

Yes — the GF Series digital MFCs ship with native EtherCAT, EtherNet/IP and DeviceNet options aimed specifically at semiconductor wafer processing tools, where EtherCAT has become the dominant deterministic fieldbus.

Is a Sho-Rate rotameter accurate enough for analytical work?

For visual confirmation that gas is flowing — yes. For quantitative analytical results — no, you would use a digital MFC. The Sho-Rate is typically used as an in-line purge / sweep indicator, not as a quantitative measurement device.

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