Portable Low Pressure Drop Gas Mass Flow Meters

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

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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

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: <10 ms
Operating temperature: –10°C to +60°C
Full scale operating pressure: 60 PSIA (4.1 barA)
Rechargeable battery lifetime: 18 hrs

Mass flow meter operating manual

Device features and accessories

Features

Simultaneously measure volumetric flow, mass flow, gas pressure, and gas temperature.
Field-adjustable engineering units and STP/NTP conditions.
Select process gas from 98+ preloaded NIST-traceable gas calibrations.
Define and store up custom gas mixtures of up to 5 constituent gases.
Read measurements from the backlit display and control configuration using the integrated touchpad.
Optional ntegrated dual flow totalizers and alarms

Explore device features

Accessories

Micro-USB to USB cable for power and serial communication
USB to global wall adapter converter
FlowVision software (download)

Additional accessories sold separately

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

Customize further

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