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Alicat MW - Low Pressure Drop Gas Mass Flow Meter

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  • Pressure drops as low as 0.07 PSID
  • Flows from 0.5 SCCM up to 1000 SLPM
  • 98+ Preloaded Gases and Gas Mixtures
  • Less than 1 second warm-up time
  • Up to ±0.6% of reading

High-accuracy, multivariate flow measurement with minimal system impact

Alicat MW Whisper Series mass flow meters monitor you mass flow with minimal pressure drop in your process. Pressure drops are as low as 5 mbar at full scale flow rates, meaning they can operate and near atmospheric pressures or on just a whisper!

The mass flow meter is repeatable and accurate with calibrations up to ±0.6% of reading accuracy.

Every Whisper device has a 10,000:1 turndown ratio with full scale flow rates starting from 0.5 SCCM going up to 1000 SLPM.

The mass flow meter can be used as a standalone meter with the use of local display and push button keypad, the local display allows the user to see all flow data visible on one screen (mass flow, volumetric flow, absolute pressure, temperature).

Key specifications

The data in the table below are standard configurations for models 10 sccm full scale through 100 slpm full scale. Please refer to the Mid-flow data sheet for full details.

Mass Flow Accuracy at Calibration Conditions1±0.75% of reading or ±0.1% of full scale, whichever is greater
High Accuracy Option1±0.6% of reading or ±0.1% of full scale, whichever is greater
Bidirectional Option1No additional uncertainties
Repeatability (2σ)±(0.1% of reading + 0.02% of full scale)
Flow Measurement Range0.01–100% of full scale
Temperature SensitivityMass flow zero shift: ±0.03% of full scale per °C from tare temperature
Mass flow span shift: ±0.01% of reading per °C from 25°C
Pressure SensitivityMass flow zero shift: ±0.01% of full scale per ATM from tare pressure
Mass flow span shift: ±0.1% of reading per atmosphere from calibration conditions
Operating Temperature Range−10–60°C (expanded range available)
Temperature Accuracy±0.75°C
Operating Pressure Full Scale60 PSIA (additional options available)

1 - Stated accuracy is after tare under equilibrium conditions. Extreme gas behavior (especially near state boundaries) can introduce additional flow uncertainties.

Alicat MW Whisper Series - Video demonstration

RS-232 communications are standard as well as an analogue output signal such as 0-5 Vdc. Whisper series can also offer a secondary analogue output for flow, pressure or temperature.

Every Alicat device is backed by the manufactures limited life time warranty and ships with a NIST traceable calibration certificate.

MW Whisper series mass flow meters have a maximum operating pressure of 60 PSIG.

Fill out the Configurator Form so our engineers can craft the perfect custom solution for you:

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Other features

  • CSA/ATEX area classification is optional. Ex nA IIC, T4 Tamb. -40°C ≤ Ta ≤ +50°C

Useful article

Model numbers

  • MW-0.5SCCM-D
  • MW-1SCCM-D
  • MW-2SCCM-D
  • MW-5SCCM-D
  • MW-10SCCM-D
  • MW-20SCCM-D
  • MW-50SCCM-D
  • MW-100SCCM-D
  • MW-200SCCM-D
  • MW-500SCCM-D
  • MW-1SLPM-D
  • MW-2SLPM-D
  • MW-5SLPM-D
  • MW-10SLPM-D
  • MW-20SLPM-D
  • MW-40SLPM-D
  • MW-50SLPM-D
  • MW-100SLPM-D
  • MW-250SLPM-D
  • MW-500SLPM-D
  • MW-1000SLPM-D


The Alicat MW - Low Pressure Drop Gas Mass Flow Meter is widely used in the following industries:

Alicat recalibration service

Alicat Calibration and Service Centre

We provide a certified annual recalibration service on all Alicat mass flow meters and mass flow controllers. Further details on our recalibration service.

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