HRS-306 Flow and Level Trainers

Equipment Overview

Double-capacity water tank control experimental system, help students better understand the control algorithms learned in the knowledge. The use of this system can meet the school's needs for control system experimental teaching, to the students get the most intuitive reflection of the experiment. The current industrial computer control, most of which still lies in the control of temperature, pressure, level, flow and other practical systems, the control process is roughly as follows: first of all, through the sensor to obtain the measured value of the control object, and then through the A/D conversion of the analogue measurements into digital quantities that can be processed by the computer, and then the computer using certain control algorithms to calculate the control quantity; and then through the D / A device to the digitization of the control volume Converted to analogue, and finally added to the controlled object, this process is a complete control process. The liquid level control process of the experimental tank is similar to the above, and a better control effect can be obtained. This experimental device is simple, in addition to the system's friendly interface allows users to easily get started.

The system consists of a double-capacity water tank as the control object, the liquid level of the tank H1 and H2 as the controlled quantity. Changes in the level of the tank, are converted by the pressure sensor into a 4-20mA standard electrical signals, all I / O interface signals were led in the control surface, to facilitate access to a variety of controllers.

The entire experimental system flow shown in Figure 1. The experimental object is a double-capacity water tank. The experimental configuration has two control tanks, water storage tanks and diaphragm pumps, level transmitters, switching pipeline status of the solenoid valve and other components. The entire experimental system adopts an integrated structure, open all around, not only to ensure that the experimental system is neat and beautiful, in line with the aesthetic requirements of modern laboratories, but also to allow students to see each component of the experimental system, to enhance students' perceptual understanding of the experiment. 

Experimental water is supplied to the control tank by the drive amplifier through the diaphragm pump and valve. The whole piping system can be combined into different experimental circuits by switching on and off the solenoid valve.

Usually the control parameters of industrial objects change in a wide range, the experiment is designed to provide set values and PID parameters setting options, by setting different parameters to meet different control requirements.

The device has different controlled models, either first-order (single-capacitor) or second-order (double-capacitor), which can be switched through the human-machine interface to carry out different experiments.

Practical training projects

1. Diffusion silicon liquid level transmitter zero point and full scale adjustment experiment;

2. Characteristic test experiment of single-capacity self-balancing water tank;

3. Characteristic test experiment of double-capacity self-balancing water tank;

4. Single-capacity water tank level control experiment;

5. Double-capacity water tank level control experiments;

6. Experiments on serial control of water tank level.