Configuration Options

649b compact pressure controllers with mass flow meter 649B Integrated Pressure Controller, Compact, Series 649B


  • Type
    649 Pressure Controller with Capacitance Manometer and Mass Flow Meter
  • Pressure Range
    10, 20, 50, 100, 1000 mmHg (Torr) Full Scale
  • Valve Orifice
    50, 200, 1000, 5000 sccm (nominal Full Scale flow rates for N2 with 15 psig on inlet and atmospheric pressure on outlet)
  • Flow Rate
    10, 20, 50, 100, 200, 500, 1000, 2000, 5000 sccm (Full Scale)
  • Trip Points
    Pressure: Two open-collector transistors
    Rated: 250 mA @ 30 VDC
    Adjustable: 1 to 100% of Full Scale
    Hysteresis: 3% of Full Scale
    Indicators: Green LEDs on when actuated
  • Pressure Control Accuracy
    ±0.2% of Full Scale
  • Transducer Over Pressure Limit
    45 psia or 2x Full Scale, whichever is greater
  • Maximum Differential Pressure
    150 psi (consistent with transducer overpressure limit)
  • Control Mode
  • Pressure Measurement Accuracy
    ±0.5% of Reading (includes linearity, hysteresis, and repeatability)
  • Zero Temperature Coefficient
    ±0.04% of Full Scale/°C
  • Span Temperature Coefficient
    ±0.04% of Reading/°C
  • Control Range
    2 to 100% of Full Scale
  • Typical Response Time
    1.0 sec (excluding system time constant)
  • Operating Temperature
    0 to 50°C (32 to 122°F)
  • Storage Temperature
    -20 to 80°C (-4 to 176°F)
  • Flow Measurement Range
    1% to 100% of Full Scale
  • Flow Repeatability
    ±0.2% of Full Scale
  • Flow Resolution
    0.1% of Full Scale
  • Flow Accuracy
    ±1.0% of Full Scale (including non-linearity, hysteresis, and non-repeatability referenced to 760 mmHg and 0°C)
  • Flow Span Temperature Coefficient
    < 0.08% of Reading/°C
  • Flow Zero Temperature Coefficient
    < 0.05% of Full Scale/°C
  • Flow Reading Pressure Coefficient
    <0.02% of Reading/psi
  • Input Power
    ±15 VDC ±5%, 300 mA max.
  • Connector
    15-pin male Type “D"
  • Meter Response Time
    <100 msec
  • Meter Warm-up Time
    <2 min (within 0.2% of Full Scale steady state)
  • RFI Sensitivity
    SAMA 33.1, 1-abc: <0.2% of Full Scale
  • Input-Output Signals
    Pressure: 0-10 VDC default (user settable to 0-5 VDC)
  • Cable Length
    100 ft. (30 m) max.
  • Compliance


Analog Operation

The 649 is powered by ±15 VDC at only 300 mA. The default pressure output and input control signals are 0-10 VDC. Two trip points are included in the 649, with LED status indicators, for use as simple on/off process limits. The 649’s control loop tuning parameters are preset for typical installation conditions, but are field adjustable for different conditions and optimum performance. The Proportional and Integral Term adjustments are simple rotary switches, providing a wide dynamic control range.

Control Loop

In the 649B, a pressure transducer monitors the pressure to be controlled at the downstream end of the controller. Actual pressure is compared in the electronics to the pressure set point signal. An appropriate signal is then generated to adjust the proportioning control valve to bring actual pressure into agreement with the desired set point. The internal control valve can be specified with one of four orifices allowing pressure control in systems with Full Scale flows from 10 sccm to 5 slm.

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