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Alicat Scientific

MCD Series Standard Bidirectional Series Mass Flow Controller

Control flow in both directions with the world's first bidirectional mass flow controller

Have questions? We're here to help!
Have questions? We're here to help!

Sometimes a process is too complex for a standard mass flow controller. Alicat’s multi-directional mass flow controllers consolidate into one instrument what would otherwise require two or three separate devices.

When you need to control flow in two directions, choose the world’s first bidirectional mass flow controller, Alicat’s MCD series.  Control flows into your flowing or closed process in one direction, and then reverse flow with multivariate measurement of flow, pressure and temperature in each direction. Or control flow into a closed process using pressure control while monitoring flow rates, and then vent the volume with no need for additional bleed valves.

Instruments in the MCD series are also available with an optional “S” configuration for use with aggressive or corrosive gases (MCDS).  In this configuration, the valves are upgraded to 303 stainless steel, the sensor to 316L stainless steel, and the elastomers to FFKM.  Some corrosive gases require 316L stainless steel throughout the flow path, and in this case, both valves (type PCA) and flow body can be upgraded to 316L stainless steel for full-scale flow ranges of 20 slpm or less.

Alicat’s MCD series mass flow controllers feature dual digital and analog communications by default and can be ordered with Ethernet/IP, DeviceNet, Profibus or Modbus communications for easy integration into your digital industrial or laboratory network.  Other build options include your choice of display, downstream valve, and flow totalizers as well as performance options.  Need further customization?  Contact us and we’d be happy to help you build the instrument you need.

Each flow controller comes with a NIST-traceable calibration certificate and an Alicat operating manual.  Power supply sold separately. 

Other Alicat Mass Flow Controllers
The MCDW applies our Whisper technology with low pressure drop to bidirectional applications like breathing simulations.

• Measure mass flow and volumetric flow in both directions, plus absolute pressure and temperature
• Control mass or volumetric flow from a pressurized source or from vacuum
• Control absolute pressure in a flowing process or closed volume
• 50 - 100 ms control response for all configurations
• Numerous user-selectable engineering units
• Digital and analog outputs
• Includes COMPOSER™ gas composition firmware
• Multiple build and performance options
• NIST traceable
• Lifetime warranty

STP/NTP Default25°C & 1 atm STP/0°C & 1 atm NTP
Ingress ProtectionIP40
Wetted MaterialsMCD: 303 & 302 Stainless Steel, Viton®, Heat Cured Silicone Rubber, Glass Reinforced Polyphenylene
Sulfide, Heat Cured Epoxy, Aluminum, Gold, Brass, 430FR Stainless Steel, Silicon, Glass.
MCRD: 303 & 302 Stainless Steel, Viton®, Heat Cured Silicone Rubber, Glass Reinforced Polyphenylene Sulfide, Heat Cured Epoxy, Aluminum, Gold, 416 Stainless Steel, Silicon, Glass
Maximum Available Range-5000 - 5000 slpm
Minimum Available Range-0.5 - 0.5 sccm / -500 sμlm - 500 sμlm
Turndown Ratio200:1
Standard Accuracy Calibration± (0.8% of the reading + 0.2% of FS in both directions)
Optional High-Accuracy Calibration± (0.4% of the reading + 0.2% of FS in both directions)
Repeatability± 0.2% of FS
Typical Control Response Time50 - 100 ms (as low as 25 ms with PID tuning)
Compatible Gases98
Operating Temperature-10°C - 60°C
Max Internal Pressure (Static)145 PSIG (160 PSIA)
Proof Pressure175 PSIG (190 PSIA)

• Automated leak testing with bidirectional flow control
• Testing and characterization of a pressure relief valve

  • Thumbnail of document Alicat MCD Controller datasheet 2163
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    Alicat MCD Controller datasheet 2163

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  • Thumbnail of document DOC MANUAL MPL 8 14862
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    DOC MANUAL MPL 8 14862

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  • Thumbnail of document M cut sheet 2 14863
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    M cut sheet 2 14863

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