Flow control like you’ve never seen before

Alicat Scientific proudly introduces the world’s first bidirectional flow controller. Control flows into your process in one direction, and then switch directions. Or control flows into a closed process, and then vent the volume with no need for additional bleed valves.
White Paper Specs Manual

 

The most versatile flow controller in the world

  • 50-100 ms control response for all configurations.
  • 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.
  • Numerous user-selectable engineering units.
  • Includes COMPOSER™ gas composition firmware.
MCD-Series bidirectional mass flow controller, shown with IPC option

MCD-Series bidirectional mass flow controller, shown with optional potentiometer control


 

Questions about mass flow controllers?




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MCD Standard Bidirectional Series

Alicat MCD-series bidirectional mass flow controller
Control flow in both directions with the world’s first bidirectional mass flow controller. Maintain speed and accuracy at flows as low as 2.5 microliters per minute or as high as 50 slpm.
MCD Specs

MCRD High-Flow Bidirectional Series

Alicat high-flow bidirectional mass flow controller, shown with optional color display
Maintain speed and accuracy at high flows (50-3000 slpm). Alicat is the world’s only manufacturer of near-frictionless rolamite valves for precise control of high-rate gas flows. Proprietary orifice patterns enable us to customize a rolamite to satisfy your application and performance requirements.
MCRD Specs

MCDW/MCRDW Low Pressure Drop Series

Whisper low pressure drop mass flow controllers
Minimize system impact with pressure drops as low as 4 mbar (0.06 psid) at full-scale flows. Alicat “Whisper” Series controllers enable flow control at near-atmospheric pressures, perfect for aerospace and environmental gas analysis applications. Max range: -500 to +500 slpm.
MCW Specs Go to Whisper page.

MCDS/MCRDS Anti-Corrosive Series

MCRDS-Series high-flow bidirectional mass flow controller for corrosive gases, shown with optional color display
Withstand corrosion caused by aggressive gases such as NH3, H2S and SiH4 with durable 316L stainless steel. All ranges available. Click the “Quick Specs” tab for a listing of included corrosive gas calibrations.
MCS Specs

Common Instrument Options

View other available instrument options here.

MC/MCR Single-Valve Series

Alicat MC-series mass flow controller
Standard mass flow controllers for one-way flow control. May be customized as “Whisper” (MCW) or anti-corrosive (MCS) controller. All ranges available to 0-3000 slpm.
MC Specs Go to MC page.

 

Have questions? Let us help.

Use Online Chat, or email us at info@alicat.com, or call and talk to our expert apps engineers: Tel: 520-290-6060

Download MCD/MCRD SpecsMCW SpecsMCS Specs

Accuracy

  • Standard accuracy (NIST-traceable): +/- (0.8% of the reading + 0.2% of the full-scale negative to positive range)
  • Optional high-accuracy calibration: +/- (0.4% of the reading + 0.2% of the full-scale negative to positive range)
  • Accuracy specs apply to preloaded and COMPOSER™ gas calibrations.

Speed of Response

  • Standard response time constant: 50 ms
  • High-flow response time constant: 100 ms (MCRD/MCRWD/MCRDS-Series)

Gases


Ranges

  • Available ranges: any full-scale range from -0.5 to +0.5 sccm, to -3000 to +3000 slpm
  • Standard linear range: -100 to +100% of full scale with -0.5% to +0.5% deadband, 200:1 turndown
  • 316L linear range: -1% to +1% deadband, 100:1 turndown (MCDS/MCRDS)

Pressures

  • Maximum line pressure: 145 psig (standard) or 50 psig (MCDW/MCRDW)
  • Standard pressure drop: 1-29 psi at full scale, depending upon flow range
  • “Whisper” MCDW/MCRDW pressure drop: 0.06-0.69 psi at full scale, depending upon flow range

Communications

  • Standard communications: RS-232 digital and 0-5 volt analog
  • Optional analog communications: 1-5v, 0-10v, 4-20 mA; secondary outputs also available
  • Optional communications protocols: RS-485, Modbus RTU (over RS-232 or RS-485), PROFIBUS
  • Standard connector: 8-pin mini-DIN
  • Optional connector: 9-pin or 15-pin D-sub connectors, configured to match any existing pinout

Display

  • Simultaneous real-time readings of setpoint, mass flow, volumetric flow, absolute pressure and temperature
  • Standard display: 2.1″ monochrome LCD digital display with touch pad interface
  • Optional 2.1″ backlit color TFT digital display with touch pad interface

Warranty

  • Limited lifetime warranty
  • Controller unaffected by bumps, humidity or changes in orientation


Gas Select™ 5.0 Gas List for Alicat Mass Flow Meters and Controllers

All Alicat Scientific mass flow meters and mass flow controllers come standard with NIST Ref Prop 9 gas properties data for up to 130 preloaded gas calibrations. Users may switch between selected gases on the fly without any need for recalibration of the mass flow meter or controller. All Gas Select™ calibrations retain the instrument's specified NIST-traceable calibration accuracy. (See individual specifications sheets for details.)
Pure GasesBioreactor Gas MixesPure Corrosives
• Acetylene (C2H2)
• Air
• Argon (Ar)
• i-Butane (i-C4H10)
• n-Butane (n-C4H10)
• Carbon dioxide (CO2)
• Carbon monoxide (CO)
• Deuterium (D2)
• Ethane (C2H6)
• Ethylene/Ethene (C2H4)
• Helium (He)
• Hydrogen (H2)
• Krypton (Kr)
• Methane (CH4)
• Neon (Ne)
• Nitrogen (N2)
• Nitrous Oxide (N2O)
• Oxygen (O2)
• Propane (C3H8)
• Sulfur Hexafluoride (SF6)
• Xenon (Xe)
• 5% CH4 95% CO2
• 10% CH4 90% CO2
• 15% CH4 85% CO2
• 20% CH4 80% CO2
• 25% CH4 75% CO2
• 30% CH4 70% CO2
• 35% CH4 65% CO2
• 40% CH4 60% CO2
• 45% CH4 55% CO2
• 50% CH4 50% CO2
• 55% CH4 45% CO2
• 60% CH4 40% CO2
• 65% CH4 35% CO2
• 70% CH4 30% CO2
• 75% CH4 25% CO2
• 80% CH4 20% CO2
• 85% CH4 15% CO2
• 90% CH4 10% CO2
• 95% CH4 5% CO2
*These gases require MS/MCS-Series instruments.
• Ammonia (NH3)
• Butylene (1-Butene)
• Cis-Butene (cis-2-Butene)
• Iso-Butene
• Trans-Butene
• Carbonyl Sulfide (COS)
• Chlorine (Cl2)
• Dimethylether (CH3OCH3)
• Hydrogen Sulfide (H2S)
• Nitrogen Trifluoride (NF3)
• Nitric Oxide (NO)
• Propylene (C3H6)
• Silane (SiH4)
• Sulfur Dioxide (SO2)
Breathing GasesFuel Gas MixesRefrigerants
• EAN-32 (32% O2+68% N2)
• EAN-36 (36% O2+64% N2)
• EAN-40 (40% O2+60% N2)
• EA-40 (40% O2+60% Air)
• EA-60 (60% O2+40% Air)
• EA-80 (80% O2+20% Air)
• Heliox-20 (20% O2+80% He)
• Heliox-21 (21% O2+79% He)
• Heliox-30 (30% O2+70% He)
• Heliox-40 (40% O2+60% He)
• Heliox-50 (50% O2+50% He)
• Heliox-60 (60% O2+40% He)
• Heliox-80 (80% O2+20% He)
• Heliox-99 (99% O2+1% He)
• Metabolic Exhalant (16% O2+78.04% N2+5% CO2+0.96% Ar)
Coal Gas 50% H2+35% CH4+10% CO+5% C2H4
Endothermic Gas 75% H2+25% N2
HHO 66.67% H2+33.33% O2
LPG HD-5 96.1% C3H8+1.5% C2H6+0.4% C3H6+1.9% n-C4H10
LPG HD-10 85% C3H8+10% C3H6+ 5% n-C4H10
Nat Gas 93% CH4+3% C2H6+1% C3H8+2% N2+1% CO2
Nat Gas 95% CH4+3% C2H6+1% N2+ 1% CO2
Nat Gas 95.2% CH4+2.5% C2H6+0.2% C3H8+0.1% C4H10+1.3% N2+0.7% CO2
Syn Gas 40% H2+29% CO+20% CO2+11% CH4
Syn Gas 64% H2+28% CO+1% CO2+7% CH4
Syn Gas 70% H2+4% CO+25% CO2+1% CH4
Syn Gas 83% H2+14% CO+3% CH4
*These gases require MS/MCS-Series instruments.
• R-11 Trichlorofluoromethane (CCl3F)
• R-14 Tetrafluoromethane (CF4)
• R-22 Difluoromonochloromethane (CHClF2)
• R-23 Trifluoromethane (CHF3)
• R-32 Difluoromethane (CH2F2)
• R-115 Chloropentafluoroethane (C2ClF5)
• R-116 Hexafluoroethane (C2F6)
• R-124 Chlorotetrafluoroethane (C2HClF4)
• R-125 Pentafluoroethane (C2HF5)
• R-134A Tetrafluoroethane (CH2FCF3)
• R-142B Chlorodifluoroethane (CH3CClF2)
• R-143A Trifluoroethane (C2H3F3)
• R-152A Difluoroethane (C2H4F2)
• RC-318 Octafluorocyclobutane (C4F8)
• R-404A (44% R-125+4% R-134A+52% R-143A)
• R-407C (22% R-32+25% R-125+52% R-134A)
• R-410A (50% R-32+50% R-125)
• R-507A (50% R-125+50% R-143A)
Chromatography GasesOxygen Concentrator Gas Mixes
• P-5 (5% CH4+95% Ar)
• P-10 (10% CH4+90% Ar)
• 89% O2+7% N2+4% Ar
• 93% O2+3% N2+4% Ar
• 95% O2+1% N2+4% Ar
Welding GasesStack/Flue Gas MixesLaser Gas Mixes
• C-2 (2% CO2+98% Ar)
• C-8 (8% CO2+92% Ar)
• C-10 (10% CO2+90% Ar)
• C-15 (15% CO2+85% Ar)
• C-20 (20% CO2+80% Ar)
• C-25 (25% CO2+75% Ar)
• C-50 (50% CO2+50% Ar)
• C-75 (75% CO2+25% Ar)
• He-25 (25% He+75% Ar)
• He-50 (50% He+50% Ar)
• He-75 (75% He+25% Ar)
• He-90 (90% He+10% Ar)
• A1025 (90% He+7.5% Ar+2.5% CO2)
• Stargon CS (90% Ar+8% CO2+2% O2)
• 2.5% O2+10.8% CO2+85.7% N2+1% Ar
• 2.9% O2+14% CO2+82.1% N2+1% Ar
• 3.7% O2+15% CO2+80.3% N2+1% Ar
• 7% O2+12% CO2+80% N2+1% Ar
• 10% O2+9.5% CO2+79.5% N2+1% Ar
• 13% O2+7% CO2+79% N2+1% Ar
• 4.5% CO2+13.5% N2+82% He
• 6% CO2+14% N2+80% He
• 7% CO2+14% N2+79% He
• 9% CO2+15% N2+76% He
• 9.4% CO2+19.25% N2+71.35% He
• 9% Ne+91% He

Ask Alicat: How do you control flow in TWO directions?

Alicat Scientific introduces the world’s first bidirectional flow and pressure controller: the dual-valve MCD. Control mass flow, volumetric flow and pressure in both directions with stand-alone control and 30 on-board gas calibrations over a 200:1 turndown range. Or control pressure or flow into a closed process, and vent the volume with no need for additional bleed valves or continuous outgassing. The MCD is the single most versatile flow controller in the world.

Ask Alicat: How fast is an Alicat mass flow controller?

Flow stability and accuracy depend on fast control response, and Alicat is the fastest. This video demonstrates 0 to 100% setpoint changes with settling times of less than 30 ms and control T/C of only 7.4 ms.

Alicat Turndown Ratio for Mass Flow

Alicat demonstrates an incredible 5000:1 turndown ratio, commanding a 5 slpm (5000 sccm) mass flow controller to control down to 1 sccm!

The Fastest Flow Controller Company in the World

How can Alicat claim to be the fastest flow controller company in the world? This video introduces you to some of the many ways that Alicat mass flow and pressure instruments can make you more efficient, saving you time and money.

Ask Alicat: What Is Pressure Drop?

Pressure drop is the amount of line pressure that is permanently lost as gas passes through an instrument in a gas line. Alicat Scientific demonstrates the importance of pressure drop for gas flow processes and shows how you can greatly reduce pressure drop by using its Whisper Series of mass flow instruments.

Gallery

MCD-Series bidirectional mass flow controller, shown with IPC option

MCD-Series bidirectional mass flow controller, -2 to +2 slpm, shown with IPC option

MCD-Series bidirectional mass flow controller, shown with IPC option

MCD-Series bidirectional mass flow controller, -2 to +2 slpm, shown with IPC option

MCD-Series bidirectional mass flow controller, shown with IPC option

MCD-Series bidirectional mass flow controller, -2 to +2 slpm, shown with IPC option

MCRD-Series high-flow bidirectional mass flow controller, shown with optional color display

MCRD-Series high-flow bidirectional mass flow controller, shown with optional color display

MCRDS-Series high-flow bidirectional mass flow controller for corrosive gases, shown with optional color display

MCRDS-Series high-flow bidirectional mass flow controller for corrosive gases, shown with optional color display

In the Box

Compatible Accessories:


Bidirectional Flow Control for Remote Air Sampling and Calibration

Alicat’s MCD Series bidirectional mass flow controller lets you sample ambient air in one direction and then periodically calibrate your gas analyzer in the other direction without disconnecting any part of the system. This allows for easier operation and calibration of remote air monitoring stations.
See the full app note here.

Remote air sampling and calibration using an Alicat bidirectional mass flow controller

Remote air sampling and calibration using an Alicat bidirectional mass flow controller