An industrial heating system requires a control system. A few applications might require control systems more than the others. So, it is necessary to make sure that all the heating systems come with an adequate control panel. With the help of process control, you can improve the thermal system’s performance. This, in turn, helps in extending the life of the electric heater. You will find various kinds of controls in industrial electric heating. The controls vary in performance and accuracy.
Let’s take a look at the power and temperature control of EUROLINIA.
The bulb and capillary thermostats along with PID controls are some of the most crucial types of controls used in an industrial electric heater.
Bulb and Capillary Thermostats
This is a temperature control system that is easy to operate and is suitable for applications that do not need high-accuracy control. An increase in temperature makes the fluid expand. The fluid that expands tends to turn the switch off as the temperature comes closer to the desired temperature that has been set up by the operator. When the fluid present in the capillary cools down, the switch is turned on and will offer a control voltage to an electromagnetic relay or MDR or mercury displacement relay.
PID Temperature Controls
A PID is the three mode controllers integrating integral, proportional, and derivative actions for offering accurate and stable temperature control. It is derivative and integral actions make it an ideal choice for complicated thermal systems. The temperature control accepts input from different types of sensors. This includes thermocouples and resistance temperature control detectors. It outputs a voltage that is used for controlling a wide range of devices. This includes mercy displacement relays and electromagnetic contractors.
Given below are the most common power switching devices that are used in the heating system.
Mercury Displacement Relays
An MDR will operate like an electromagnetic relay but the only difference is it uses mercury as its contact element. The control panel comes with a cycle time of 5 seconds. Thus, it is much faster than the electromagnetic relay. An MDR will generate electrical noise and will generate heat. However, it will provide longer heater life and relay in comparison to the electromagnetic relay. The use of MDRs in various industrial processes is often discouraged by environmental regulations.
Electromechanical relays come with a limited life, low accuracy, and generate a considerable amount of electrical noise. To make sure it has optimum performance, the minimum cycle time has to be 30 seconds. With the temperature control, you will get control over the voltage causing the contacts to come together. It will complete the circuit and will supply voltage to the heater. An electromagnetic relay is known to put the heater on a thermal shock. This shortens its life.
Silicon Controlled Rectifier Power Controllers
An SCR power control panel comes with many advantages such as reduced maintenance cost, extended heater life, precise control of the thermal process, and more. An SCR power control cycles as fast as 8ms. If you use it the right way, the control device can easily cycle on and off for about 1,000,000,00. So, it means that the SCR controller will provide reliable services for several years. The control panel will generate higher current units and heat. So, it needs to have a cooling mechanism. Like a solid-state relay, SCR power controls have little electrical noise.
Solid-state relays are known to have good accuracy. However, they might generate a significant amount of heat. To ensure the best performance, the control device has to be used in a vented electrical enclosure. The cycle time being just one second, solid-state relays are used in heating systems that need high accuracy. Moreover, a solid-state relay might generate very negligible noise. So, it can lengthen the electrical heater’s life cycle.
With an increase in demand for reliability and flexibility, intelligent SCR power supplies are turning out to be a good solution for electric heaters. Users are installing it to gain a competitive advantage.
The above-given information will help you when you have to install an industrial heating system.