The highest level of safety for temperature control units (TCU) in ATEX zones is achieved by installing the control panel outside the explosive hazard area, adopting a dual-configuration approach.
In a previous post, we explored the challenges and solutions regarding temperature control in ATEX environments, focusing on the design of safe and efficient thermoregulation units. As previously mentioned, one of the most effective strategies for optimizing temperature control in these applications is to separate the control panel from the hazardous area by installing it in a safe zone. This configuration offers numerous advantages in terms of safety, reliability, and operational management.
Dual-configuration approach: ATEX TCU + Remote control
To ensure optimal temperature control in explosive hazard zones, temperature control units (TCUs) are frequently designed as two separate units:
- The TCU itself, installed within the ATEX area
- A remote control panel, positioned in a safe zone
This solution eliminates the need for complex electronic devices within the ATEX area, thereby reducing the risk of failure and simplifying maintenance.
The dual-configuration solution therefore comprises several key components:
- Temperature Control Unit (TCU) in the ATEX zone
The unit installed in the ATEX zone houses all components involved in the temperature control process, designed with appropriate protection measures:
• Heat exchangers and thermal circuits constructed using materials and configurations compliant with ATEX standards.
• Explosion-proof electric heating elements.
• Intrinsically safe certified temperature sensors (PT100, thermocouples).
• Actuators and valves with Ex d or Ex i protection for thermal flow control.
• Special shielded and insulated wiring to prevent overheating and leakage. - Control panel in the safe zone
The heart of the temperature control system is located in a non-hazardous area, allowing for the implementation of advanced electronics without ATEX constraints:• Industrial PLC for temperature management featuring advanced PID control.
• Touchscreen HMI for monitoring and manually adjusting TCU parameters.
• Data logging and reporting capabilities for thermal performance analysis.
• Remote management via connection to SCADA or cloud systems.
Image showing a temperature control unit (TCU); for ATEX zone installations, a dual configuration with a separate control panel in a safe zone allows for the use of advanced electronics to ensure maximum efficiency and reliability.