Configuration Options

CMA50A-MFC 14,000-50,000 sccm Compact, Fast Response Mass Flow Controller


  • Type
    Mass Flow Controller
  • Full Scale Flow Range
    14,001-50,000 sccm (N2)
  • Maximum Inlet Pressure
    80 psig
  • Normal Operating Pressure Differential
    14001 to 50000 sccm: 30 to 45 psid (N2)
  • Proof Pressure
    232 psi/16 bar
  • Burst Pressure
    1000 psi/70 bar
  • Control Range
    Digital I/O: 0.1% to 100% of Full Scale
    Analog I/O: 0.2% to 100% of Full Scale
  • Typical Accuracy
    ±0.8% of set point for 20 to 100% Full Scale
    ±0.16% of Full Scale for <20% of Full Scale
    (with N2 calibration gas)
  • Repeatability
    ±0.2% of Reading
  • Zero Temperature Coefficient
    ≤0.005% of Full Scale/°C
  • Span Temperature Coefficient
    ≤0.06% of Reading/°C
  • Pressure Coefficient
    <0.025% of Reading/psi
  • Response Time
    ≤100 ms typical above 10% Full Scale, 50 sccm - 5 slm Full Scale models
    ≤150 ms typical above 10% Full Scale, 10 slm Full Scale models
    (per SEMI Guideline E-17-0600)
  • Warm-up Time
    ≤1 min (to within 0.2% of Full Scale of set point)
  • Operating Temperature
    10-50°C (32-122°F)
  • Storage Temperature
    0-60°C (32-140°F)
  • Fitting Type
    Compatible with:
    Swagelok® 4 VCR® male
    surface mount (o-ring and w-seal)
    0.25 in. Swagelok compression
  • External Leak Integrity
    <1 x 10-09 (scc/sec He)
  • Leak Integrity Through Closed Valve
    <0.1% of max. Full Scale range using valve closed override command
    (to assure no flow-through, a separate positive shut-off valve is required)
  • Wetted Materials
    Aluminum, Stainless Steel, Silicon, Silicon Oxide, Silicon Carbide, Viton®, Glob Top
  • Seal Material
  • Valve Position
    Normally closed
  • Set Point Command Signal
    0-5 VDC (0-10 VDC, optional)
  • Power Requirements
    24 VDC @ (±10%), <4 watts
  • Flow Input Output Signal
    0-5 VDC (0-10 VDC, optional)
  • Analog I/O Connector
    9-pin Type D
  • Weight
    0.68 lbs (310 grams) (VCR)
  • Compliance


CMA50A Selection Guide

C-Series mass flow controllers and meters are selected based on the gas and range desired.  Use this table to determine the best model for your application:

Gas SEMI# Gas Symbol Minimum Full Scale Maximum Full Scale
1 He 16001 50000
4 Ar 17001 49000
8 Air 14001 50000
13 N2 14001 50000
15 O2 13001 50000
110 SF6 4501 8100

C-Series Communication Options

Digital I/O RS485 PROFINET® Modbus
Input Power Required 24 VDC @ (±10%), <4 watts +24 VDC (<5 watts) +24 VDC (<5 watts)
Connector 9 pin Type D male (power and comm.) 2 x RJ-45 (comm.) male, M8 male, 5 pin (power) 1 x RJ-45 (comm.) male,DC power plug
Data Rate Switch/Selection No switch
Set data rate via RS485
MFC: No switch
Comm. Rate(s) 9.6 Kbps
19.2 Kbps
38.4 Kbps
MFC: 100 Mbps
MAC ID Switches/Addresses Set address over RS485 Station Addresses 0,0 to 9,9 N/A N/A
Network Size Up to 32 nodes N/A N/A
Visual Indicators LED Power
LED Run (green)
LED Maint (amber)
LED BUS Fault (red)
LED Ready (green)
LED Sys Fault (red)
LED Module
LED Network
Compliance CE CE CE

The CMA50A compact design is only 1 inch (25.4 mm) and less than 4.4 inches (111.8 mm) high. It has standard lengths of 4.88 inches (124 mm) for 4 VCR® male and 4.54 inches (113 mm) for 0.25 inch compression seal gas line connections. Downmount versions are also available. A low thermal mass MEMS sensor provides rapid sensing of flow changes with low noise output. The solid state design of the sensor makes it resistant to water condensation, particles, pressure shock and vibration.

Fast response, wide dynamic control range, and 0.8% of set point accuracy make this MFC an excellent choice for flow control in critical process applications where noncorrosive gases are used. Typical uses can be found in mass spectroscopy, vacuum coating, bioreactor as well as many other applications. The CMA50A incorporates a fast-acting solenoid control valve coupled with the flow sensor via the MFC’s superior flow signal processing and control algorithm. This results in response times to set point of less than 100 milliseconds.

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