Alicat MW - Low Pressure Drop Gas Mass Flow Meter

Alicat MW - Low Pressure Drop Whisper Series Meter with colour screen

Alicat MW - Gas Mass Flow Meter - Low Pressure Drop Whisper with backlit screen

We aim to respond within 1 hour

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 Option¹	No additional uncertainties
Repeatability (2σ)	±(0.1% of reading + 0.02% of full scale)
Flow Measurement Range	0.01–100% of full scale
Temperature Sensitivity	Mass 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 Sensitivity	Mass 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 Scale	60 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.

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Other features

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

Useful article

What Is The Point Of An Accuracy Statement

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

Industries

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

Alicat recalibration service

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

Manufacturer

Alicat MW Series Mass Flow Meter - Low Pressure Drop

High-accuracy, multivariate flow measurement with minimal system impact