Whisper™ MCDW–Series: Low Pressure Drop Bidirectional Mass Flow Controllers
Whisper™ MCDW–Series Low Pressure Drop Bidirectional Mass Flow Controllers can control mass flow, volumetric flow, or gas pressure in both directions when there is very little available system pressure, with pressure drops as low as 0.07 PSID.
- Versatile & accurate. Real-time control of flow or pressure in both directions with NIST-traceable accuracy to ±0.75% of reading or ±0.1% of full scale for 98+ gases, including custom-defined mixtures.
- Fast control, multivariate data. Millisecond-response times immediately upon powering up, to control either mass flow, volumetric flow, or pressure and display instantaneous flow, pressure, and temperature readings, in your choice of engineering units.
- Easy integration. Custom process ports and electrical connectors, and your choice of EtherNet/IP, EtherCAT, DeviceNet, Profibus, Modbus (RTU and TCP/IP), or serial communications for easy integration into your industrial process.
Request a quote
Accessories included with purchase
Device specs and customization options
Quick Specs
MCDW-Series performance (most products)
- Available full scale ranges: 0.5 SCCM to 5000 SLPM
- Steady state control range: 0.05% – 100% of full scale
- Standard accuracy calibration, NIST–traceable: ±0.75% of reading or ±0.1% of full scale (whichever is greater)
- Optional high-accuracy calibration, NIST–traceable: ±0.6% of reading or ±0.1% of full scale (whichever is greater)
- Repeatability: ±(0.2% of reading + 0.02% of full scale)
- Typical control response time: as low as 30 ms
- Warm-up time: <1 s
MCDW-Series operating conditions
- Compatible gases: 98 pre–loaded selectable gas calibrations; additional mixtures definable with COMPOSER™
- Operating temperature: –10°C to +60°C
- Full scale operating pressure: 60 PSIA
- Proof pressure: 80 PSIA
- User selectable reference conditions (defaults): 25°C & 1 ATM (STP) and 0°C & 1 ATM (NTP)
Device Ranges & Full Specs
Devices are custom ranged from 0.5 SCCM full scale to 500 SLPM full scale with controllable ranges of 0.05% to 100% of full scale.
For a comprehensive device guide, read the mass flow controller operating manual.
Device Features
Included with each device
- Multi-variable process measurements: Simultaneously measure mass flow, volumetric flow, gas pressure, and gas temperature.
- User changeable units of measurement: Change the unit of measurement for pressure, flow, or temperature from our extensive list of engineering units.
- Gas selectability: Select your process gas from any of the 98+ preloaded NIST-traceable gas calibrations in our gas list.
- Gas Select COMPOSER™: Define 20 custom gas mixtures of up to 5 constituent gases using our Gas Select Composer™ firmware.
- Monochrome backlit LCD with integrated touchpad: Easily read measurements using the backlit display and control configurations with the user-friendly integrated touchpad.
- User adjustable setpoint ramping & limits: Configurable ramp rates allow the process variable to be controlled as fast or as slow as desired, and configurable setpoint limits protect processes from inadvertent setpoint changes.
- User adjustable standard temperature and pressure (STP) conditions: Quickly change reference conditions without need for recalibration.
- Valve close override and valve open override: Utilize alarms to quickly vent your system or stop all flow as needed.
Request at time of purchase | Free
- Optional integrated totalizers & batch control: Totalize mass flow every 1 ms for precise tracking of total flow over time and use batch control to dispense precise volumes.
Request at time of purchase | Additional cost
- Optional integrated potentiometer control: Use the integrated potentiometer to adjust setpoints with the simple turn of a knob.
Device Customization Options
Build and performance options
- Communication protocols: Analog, RS–232, RS–485, DeviceNet, EtherCAT, EtherNet/IP, Modbus RTU or TCP/IP, PROFIBUS
- Displays: Backlit monochrome or color; integrated or panel–mount
- Process connections: NPT, SAE, AN, BSPP/G, welded compression, VCR, or VCO fittings
- Elastomers: Viton, FFKM, EPDM, Silicone
- Calibration: High-accuracy; custom calibration points
Valve options & PID tuning
Your mass flow controller may be customized with one of the following valving options to ensure optimal performance under your expected process conditions.
- MCDW: small proportional control valve for flow ranges of 20 SLPM and below
- MCRDW: nearly frictionless large Rolamite proportional valve for flow rates of 50 SLPM and above
Custom PID valve tuning ensures maximum performance for your specific process conditions.
Optional Accessories
Accessories | Sold separately
- Process port fittings and filters
- Power supplies
- Communications cables and conversion cables
- BB3 and BB9 multi-drop breakout boxes
Not exactly what you’re looking for?
- Explore other multidirectional mass flow controller options.
- Check out our other flow or pressure control and measurement solutions.
- Our expert team of applications engineers is available to provide additional information, discuss your application, or answer any questions you may have.
Contact an applications engineer
