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產品簡介>實驗設備>程序控制>多變數程控(壓力\流量\液位)
多變數程控(壓力\流量\液位)
Multi-Process Station (3505)
 
產品簡介
 

The Multi-Process Station, Model 3505, consists of a 20-cm (8-inch) diameter, 92-cm (36-inch) high Plexiglass cylinder, a 10-cm (4-inch) diameter inner column for dual volume process characteristic, a pump, a diaphragm-actuated control valve, two pipe-mounted differential pressure (D/P) transmitters, and a current-to-pressure (I/P) converter. A microprocessor-based controller, a variable frequency AC drive, a dual-pen strip chart recorder, and two alarm lamps are also mounted on the main panel. A regulator needle valve controls air flow to a bubbler pipe for level measurement. In addition, at the base of the level column are two valved taps that permit connection of the D/P cell or optional manometers. A low-pressure gauge and a compound-pressure gauge are mounted on the side of the control cabinet. A pressure cap on the level process tank permits level controls of a pressurized vessel. A wet leg standpipe is also provided.

All process piping is made of clear thermoplastic (PVC). Two 30-cm (12-inch) headers allow insertion of flow measurement devices on both the inflow and outflow of the level process tank. The station includes a rotameter flow indicator in series with the process piping, and a Venturi flow-element. Flow control can be achieved by either using the pump running at fixed speed and the pneumatic control valve, or by bypassing the control valve and operating the pump at variable speed using the variable frequency AC drive.

The level column can be bypassed to operate a fast process flow loop. Pressure control is achieved the same way as flow control, with piping throttled downstream of the variable area flow meter. Coupling unions allow the Multi-Process Station to be directly coupled to other stations to achieve more advanced interactive control loops such as temperature, pH, and ratio control. Pressure taps are provided on the system piping to permit measurement of pressure drops around the system and to evaluate the system performance thoroughly.

Supporting courseware comprises 22 laboratory exercises, written specifically for the Multi-Process Station. Completion of the courseware also requires a digital multimeter and a DC process signal calibrator. These devices are available on the Lab-Volt Calibration Bench, Model 3550.

產品特色
 
  • All required gauges, switches, manometers, patchcords, hoses, and flow elements are included
  • Fault insertion capability
  • Transparent piping and valves for student observation of system operation
  • Interconnectable workstations to allow training in complex systems
  • Realistic process response
  • Quick-disconnect fittings for a rapid system configuration
  • Comprehensive courseware
  • Multi-element and ratio control capability
  • Patch-connected control devices to permit alternate control schemes and flexibility in incorporating new technology as it is developed
  • Standard industrial instrumentation
  • 產品功能
     
  • Level Measurement I ?Dry Method using a Bubble Pipe
  • Level Measurement II ?Calibration of a Level Transmitter
  • Pressure Measurement
  • Flow Measurement: Differential Pressure vs Flow Using a Venturi or Orifice Plate
  • Level Process Characteristics with Control Valve
  • Level Process Characteristics with Variable Speed Pump
  • Flow Process Characteristic with Control Valve
  • Pressure Process Characteristic
  • Proportional Control ?Level Process with Control Valve
  • Proportional Control ?Flow Process with Variable Speed Pump
  • Proportional Plus Integral Control ?Level Process with Control Valve
  • Proportional Plus Integral Control ?Pressure Process
  • Proportional Plus Integral Plus Derivative Control ?Level Process with Control Valve
  • Proportional Plus Integral Plus Derivative Control ?Flow Process with Variable Speed Pump
  • Ultimate Period Tuning of a Level Process
  • Ultimate Period Tuning of a Flow Process ?Approximation Method
  • Open Loop Tuning of a Level Process using the Reaction Rate Method
  • Open Loop Tuning of a Pressure Process
  • Troubleshooting a Level Control Process
  • Operation of a Two-Element Control Process
  • Three-Element Control Process
  • Auto-Tune Controller
  • LANGUAGE VARIATIONS
      English
    SYSTEM VOLTAGES
      120 V - 60 Hz
    220 V - 50 Hz
    240 V - 50 Hz
     
     

     

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