Temperature Controller Connection with RTD, Thermocouple, SSR

Hey, in this article, we are going to see Temperature Controller Connection Diagram with RTD, Thermocouple, Sensors, SSR, Contactor, Indication system, Alarm Systems, etc. This type of setup is used in many industrial processes where strict temperature controls are required for optimal performance. Whether it is in chemical reactions, food processing, pharmaceutical manufacturing, or material handling, maintaining the correct temperature is very important for product quality and efficiency. This system allows for precise regulation of temperature, ensuring that processes run smoothly and consistently.

Components used in the System

Temperature Controller: It is the central component of the system, the temperature controller, regulates the temperature by comparing the actual temperature with the desired set point and sending signals to other devices to maintain the desired temperature.

RTD (Resistance Temperature Detector) and Thermocouple: These are temperature sensors that measure the actual temperature of the system. RTDs and thermocouples offer different measurement methods and are chosen based on factors like temperature range, accuracy, and environmental conditions.

Solid State Relay (SSR): SSRs are used for switching power to the heating or cooling elements based on signals from the temperature controller. They provide precise control and isolation, enhancing system safety and reliability.

Contactor: Contactors are electromechanical switches used to control power to larger heating or cooling systems. They handle high currents safely, ensuring efficient operation of the temperature control system.

Indication System: Indicators such as a digital display that is already inbuilt with the temperature controller or external indication lights provide real-time feedback on the system's temperature status. They allow operators to monitor the process easily and make adjustments as necessary.

Alarm Systems: Alarm systems such as Bells or Buzzers are required to alert operators to any deviations from the desired temperature range or system malfunctions. They help prevent damage to equipment or products and ensure prompt intervention when issues arise.

Safety Devices: Additional safety devices such as thermal fuses or circuit breakers(here we have used an MCB) are used to protect the system from overcurrent or overheating conditions, enhancing overall safety and reliability.

Connection Diagram

Here, you can see the connection diagram of a Temperature Controller with an RTD, Thermocouple, SSR, Indication Lamps, Alarm System, etc.

Connection Description

First of all, I would like to remind you that different temperature controllers from different manufacturers may have different designs e.g. different terminal positions, and names which may not match with the wiring diagram shown in the above figure. So, refer to the documents of each device provided by your manufacturer.

• Here, in the above wiring diagram, you can see the power supply is connected to the pin no. 8(phase) and Pin no. 9(neutral). The power supply is connected through an MCB to protect the system.
• Here, we have used a 3-wire RTD which is connected to Pin no. 4(positive), Pin no. 5(negative), and Pin no. 6(negative). If you use a 2-wire RTD then it should be connected to Pin no. 4(positive) and Pin no. 5(negative). Or, if you use a 4-wire RTD then it should be connected to Pin no. 4(both positives), Pin no. 5(negative), and Pin no. 6(negative).
• The thermocouple is connected to Pin no. 6(positive) and Pin no. 5(negative).
• The Alarm bell is connected to Pin no. 1 and 2 Switching contacts.
• The SSR(used to control the heater) is connected to Pin No. 11(positive) and Pin No. 10(negative).
• The Relay Pins 12(NO), 13(Common), and 14(NC) are used to control the indication system where the green lamp is connected to the 14(NC) Pin and the red lamp is connected to the 12(NO). These relay terminals can be used to operate a Contactor to control large heaters or any other systems.

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