Process Control - Three Term Temperature & Flow Control Rig
A complete teaching system
with comprehensive experiments, data analysis, tutor's and student manuals
if desired, and all instruments and controllers.
- Feedback, cascade and
manual control.
- Proportional (P), Integral
(I) and Derivative (D) action
- Custom designed for technician/undergraduate
teaching
- Complete visual monitoring
- Easily operated and used
- No further development
work necessary
Specification
A QVF process control teaching
system module comprised of an electronic three term flow controller,
pneumatic controller, electronic flow indicator, pneumatic control valve,
chart recorder, electropneumatic (I-P) converter, heat exchanger, hot
water recirculation system and interconnecting pipework. Designed to
study temperature and flow control and compare the effect of annual,
feedback and cascade control modes. Supplied with all valves, controllers,
service lines and supporting structure.
Experimental Capabilities
- Tuning a PID controller
- P, PI, PID control modes
- Manual control
- Feed back control
- Cascade control
- Automatic tuning
Design Basis
- Typical temperatures and
flowrates that can be expected are given below.
- Cooling water inlet temperature
900 F
- Cooling water inlet flow
16 gph
- Hot water inlet temperature
1750 F
- Hot water outlet temperature
1300 F
- Hot water flowrate 23
gph
- Maximum hot water flow
32 gph
- Maximum cooling water
flow 26 gph
Optional Manuals
The equipment can be supplied
with the following manuals:
Tutor's manual: The
basis of a lecture course on process control and practice. Including
operating instructions, experiments, typical results and answers to
student questions.
Student manuals provide
the basics of process control and practice.
Experiment booklets
provide step-by-step instructions for performing the experiments, data
to be recorded and questions to be answered.
Additional copies of the
student manuals and experiment booklets can be reordered.
Description
The equipment is designed
to simulate a common industrial process control application, namely
the control of process fluid temperature to a downstream processing
unit, where the process fluid rate may vary and where the downstream
processor requires variations in process fluid temperature.
The process fluid in this
case is hot water which circulates through the heat exchanger from a
constant temperature water bath. The hot water flowrate is controlled
by a manual control valve and read directly by means of a variable area
flow meter. Cold water acts as the service fluid and its flowrate is
regulated by a pneumatic control valve.
The outlet hot water temperature
from the heat exchanger is maintained at a desired value by a platinum
resistance thermometer in conjunction with a temperature indicator controller
which adjusts the flow of the cooling water by means of the remote acting
control valve.
A flow indicator controller
is fitted to the PID cooling water side which can be used to investigate
simple control of flowrate. It may also be used in conjunction with
the temperature indicator to provide cascade control.
Plant operation is controlled
from a free-standing control panel fitted with a mimic diagram housing
the controllers, indicators and recording chart.
Options
Either steam or electric
heating.
Electrical System
The electrical System can
be designed to meet your local requirements
Equipment Specification
- Heat Exchanger: Glass
coil in shell type; 80mm diameter; heat transfer area = 0.3ft.2
- Hot Water tank: 2 x 3kW,
220/240V, 60Hz single phase with recirculation pump, pump and heater
on/off switches and heater thermostat.
Installation and maintenance
manual provides detailed instructions on installing and maintaining
the plant.
Instrumentation
- Temperature elements:
Platinum resistance type
- Flow element : Differential
pressure type
- Controllers: 3-term indicating
controller
- Control valve: Pneumatically-actuated
glass/PTFE valve ref. PRS 1/08/2
- Chart recorder: 2-pen
- Temperature indicator
- Electro-pneumatic ('I-to-P')
converter
- Pneumatic signal pressure
gauge
- Variable area flowmeter
- Controllers, chart recorder,
temperature indicator and signal pressure gauge are all mounted in
a control panel.
Utilities Requirements
- Compressed air: 2.0 bar,
instrument quality
- Electricity: 7kW, 220/240V,
single phase 60Hz
- Water: 2 L/min
Space Requirements
(height x floor area)
2.5 x 2.2 x 1.5 meters
Optional Equipment
spare parts kit
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