Whisper™ MW–Series: Low Pressure Drop Mass Flow Meters

Whisper™ MW–Series Low Pressure Drop Mass Flow Meters measure mass and volumetric flow rates when there is little available system pressure, with pressure drops as low as 0.07 PSID (4.8 mbarD).

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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.

FastTrack 5 day shipping options

FastTrack products are built to order and shipped within 5 business days. Eligible products include:

  • Ranges: 2 SCCM to 100 SLPM
  • Calibration: Standard or high accuracy
  • Display: Monochrome, color, or none
  • Communication protocol: Analog, RS-232, RS-485, or Modbus RTU
  • Electrical connector: 8-pin mini DIN, DB9, DB15, or locking industrial
  • Fittings: NPT

Specs, features, and customization options

Alicat builds each instrument to order to meet your specific process needs. See additional configuration options below or speak with an applications engineer to optimize your device.

Quick Specs

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: 127 ms
  • Operating temperature: –10°C to +60°C
  • Full scale operating pressure: 60 PSIA (4.1 barA)
Device features and accessories
Build and performance options
  • Communication: Analog, RS–232, RS–485, Modbus RTU, Modbus TCP/IP, DeviceNet, EtherCAT, EtherNet/IP, PROFIBUS, PROFINET
  • Process connections: NPT, SAE, AN, BSPP/G, compression, VCR, VCO
  • Displays: Backlit monochrome or color; integrated or panel–mount; none
  • Elastomers: FKM, FFKM, EPDM, Silicone
  • Calibration: Standard or high-accuracy; custom calibration points

Online Ordering

Select Alicat Whisper configurations available in our online shop
  • Ranges: 0.5 SCCM to 5 SLPM
  • Display: Back-lit Monochrome
  • Communication protocol: Serial communication over micro-USB
  • Multi-gas calibration: 98-130 gases preloaded, plus COMPOSERTM gas composition firmware.
  • Battery: rechargeable Li-ion (1880 mAh).
Buy select devices online



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Need support?

Our expert team of applications engineers is available to provide additional information, discuss your application, or answer any questions you may have.

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