Whisper™ MWB–Series: Portable Low Pressure Drop Mass Flow Meters

Whisper™ MWB-Series Portable Low Pressure Drop Mass Flow Meters measure mass and volumetric flow rates with pressure drops as low as 0.07 PSID (4.8 mbarD) for systems with little available pressure.

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Select configurations available to purchase online
  • Ranges: 0.5 SCCM to 500 SLPM
  • Display: Backlit monochrome
  • Communication: Micro USB-B
  • Fittings: NPT

Whisper devices are built for processes with little available inlet pressure or a large amount of back pressure. These devices have a larger flow body and uniquely arranged laminar flow elements, resulting in pressure drops up to 10x lower than standard devices. Whisper instruments also utilize a much more sensitive pressure sensor package to take full advantage of the lower pressure readings.

Specs, features, and customization options


Devices are custom ranged from 0.5 SCCM full scale to 1,000 SLPM full scale.

Standard specs
  • Full scale ranges: 0.5 SCCM to 1,000 SLPM
  • Measurement range: 0.01% – 100% of full scale
  • Accuracy: ±0.75% of reading or ±0.1% of full scale, whichever is greater
  • Optional high-accuracy: ±0.6% of reading or ±0.1% of full scale, whichever is greater
  • Repeatability: 0.1% of reading and 0.02% of full scale
  • Response time: <10 ms
  • Operating temperature: –10°C to +60°C
  • Full scale operating pressure: 60 PSIA (4.1 barA)
  • Rechargeable battery lifetime: 18 hrs
Device features and accessories
  • Micro-USB to USB cable for power and serial communication
  • USB to global wall adapter converter
  • FlowVision software (download)
Build and performance options
  • Communication: Serial over micro-USB (default); Bluetooth with app (optional)
  • Process connections: NPT, SAE, AN, BSPP/G, compression, VCR, VCO
  • Displays: Backlit monochrome or color
  • Elastomers: FKM, FFKM, EPDM, Silicone
  • Calibration: Standard or high-accuracy; custom calibration points

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