Flow control with orifice plate and differential pressure transmitter

UV 210/211 is a mobile control panel with a complete flow process including pump, ring chamber, orifice plate, differential pressure transmitter, controller and control valve with a positioner. The micro-processor based controller has PID function, see separate pamphlet UDC 3200. The orofice plate is mounted in a ring chamber unit and the differential pressure is measured with an electronic smart differential pressure transmitter with an output of 4 – 20 mA.
The control valve is equipped with a single acting pneumatic actuator. The control valve is guided by an electropneumatic positioner, also acting as an electric/pneumatic converter. Interchangable digital cams are supplied to provide three different flow characteristics.
All components are mounted on a industrial carriage with lockable wheels to give stability when in use.
UV 210/211 can as well as UV 200/201 be used as a complement to process model UV 103/104 or UV 400/401 and will then also serve as a water supply unit. The flow control loop is conected for sacade control of the level process, so that exercises in start up studys in cascade control can be carried out.Control model UV 210/211 is mainly a training station for mesuring flows with an orifice plate and adjusting and handling of industrial control valves with positioner.
The main objectives are to study the characteristics of the control valve, changing cams in the positioner, make zero and range adjustments. Optimization and adjustments of a flow control loop and basic configuration of the micro-processor based controller.
UV 211 is the same training unit as UV 210 except that the panel mounted controller and recorder has been removed. UV 211 is to be used together with UV 720.


Laboratory exercises
UV 210 only
  • Configuration of the micro-processor based controller.
  • Calibration of the differential pressure transmitter for measuring flow.
  • Signal characteristics without square root extraction.
  • Signal characteristics with square root extraction.
  • Calibration and adjustment of the positioner.
  • Changing of cams characteristics in the positioner.
  • Control of flow with square root extraction.
  • Control of flow without square root extraction.
  • Optimisation of controller constants in connection with PI-control of different flow and with different valve characteristics according to the calculating sensitivity method.
  • Auto tuning of controller for different loop gain (flow).


UV 103 and 210

  • Constant control of level (process with one – respective two – time constants).
  • Starting-up exercises in connection with cascade control.
  • Cascade control of level with curve analysis for different loads and controller constants (process with one – respective two – time constants).
  • Optimisation of controller constants with PI/PI and PI/PID control.


UV 210 and 400

  • Cascade control of level with one time constant.
  • Starting-up exercises.
  • Cascade control of level with one time constant.
  • Optimisation of controller with PI/PI and PI/PID control.