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 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, 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 full scale ranges: 0.5 SCCM to 1000 SLPM
  • 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, whichever is greater
  • Optional high-accuracy calibration, NIST-traceable: ±0.6% of reading or ±0.1% of full scale, whichever is greater
  • 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
  • User selectable reference conditions (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.

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
  • Communications protocols: Analog, RS–232, RS–485, DeviceNet, EtherCAT, EtherNet/IP, Modbus RTU or TCP/IP, PROFIBUS
  • 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: High-accuracy; custom calibration points
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.

  • 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

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

Optional Accessories
Accessories | Sold separately
  • Process port fittings and filters
  • Power supplies
  • Communications cables and conversion cables
  • BB3 and BB9 multi-drop breakout boxes

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