Mass Flow Controllers & Meters

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Whisper™ MCW–Series: Low Pressure Drop Gas Mass Flow Controllers

Whisper™ MCW–Series Low Pressure Drop Mass Flow Controllers rapidly reach setpoints and maintain stable control of mass flow, volumetric flow, or pressure when there is little available system pressure, with pressure drops as low as 0.07 PSID.
  • Minimal system impact. Control gas mass flow, volumetric flow, or pressure with pressure drops as low as 0.07 PSID.
  • Versatile & accurate. Real-time control with NIST-traceable accuracy to ±0.6% of reading or ±0.1% of full scale for 98+ gases, including 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, Modbus (RTU and TCP/IP), or serial communications for easy integration into your industrial process.

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Accessories included with purchase

Device specs and customization options

Quick Specs
Whisper™ MCW-Series performance (most products)
  • Available ranges: max 0–1000 SLPM, min 0–0.5 SCCM
  • Steady state control range: 0.5% – 100% of full scale
  • Standard accuracy calibration, NIST-traceable: ±0.75% of reading or ±0.1% of full scale
  • Optional high-accuracy calibration, NIST-traceable: ±0.6% of reading or ±0.1% of full scale
  • Repeatability: ±(0.2% of reading + 0.02% of full scale)
  • Typical control response time: as low as 30 ms
  • Warm-up time: <1 s
Whisper™ MCW-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: 60 PSIA
  • Full scale pressure drop (range dependent): as low as 0.07 PSID
  • Max differential pressure: 15 PSID
  • Proof pressure: 80 PSIA
  • Reference conditions: user-selectable; defaults: 25°C & 1 ATM (STP) and 0°C & 1 ATM (NTP)
Device Ranges & Full Specs

Devices are custom ranged from 0.5 SCCM full scale to 1,000 SLPM full scale with controllable ranges of 0.5% to 100% of full scale.

Device Customization & Accessories

Device customization | Build and performance options

  • Communications protocols: analog, RS–232, RS–485, DeviceNet, EtherCAT, EtherNet/IP, Modbus RTU or TCP/IP, PROFIBUS
  • Displays: monochrome or color; integrated or panel–mount
  • Process connections: NPT, SAE, AN, BSPP/G, welded compression, or VCR/VCO fittings
  • Elastomers: Viton, FFKM, EPDM, Silicone
  • Calibration: High-accuracy or custom
  • Performance: Flow totalizer; integrated potentiometer control

Valve sizing and PID tuning | Valve options

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

  • MCW: small proportional control valve for flow ranges of 2 SLPM and below
  • MCPW: small proportional control valve with the largest orifice (not available for corrosive configurations)
  • MCHW: hammerhead configuration, which pairs two small valves working side-by-side as one valve
  • MCRW: nearly frictionless large Rolamite proportional valve for flow rates of 5 SLPM and above

Accessories | Sold separately

  • Process port fittings and filters
  • Power supplies
  • Communications cables and conversion cables
  • BB3 and BB9 multi-drop breakout boxes

Not exactly what you’re looking for?

  • Explore other gas mass flow controller options, including high pressure and anti-corrosive devices.
  • Check out our other flow or pressure control and measurement solutions.
  • Our expert team of applications engineers is available to provide additional information, discuss your application, or answer answer any questions you may have.

Contact an applications engineer

Questions about this product?