Key Features and Overview of the MTL 722+ Shunt-Diode Safety Barrier:

1. Shunt-Diode Safety Barrier:

   • This type of barrier is designed to provide intrinsic safety by limiting the amount of energy in electrical circuits to a level that is incapable of causing ignition in explosive atmospheres.
   • The shunt-diode design specifically offers voltage clamping to protect against voltage spikes that could potentially lead to sparking or overheating, thereby preventing hazardous situations.

2. 22V Rating:

   • The 22V specification indicates the maximum voltage the barrier can handle. The device is designed to isolate and protect circuits that work at or below 22 volts, which is suitable for field devices (such as sensors, transmitters, or other low-voltage systems) commonly used in intrinsically safe systems.

3. 150Ω Resistance:

   • The 150Ω indicates the typical input impedance that the barrier is designed to work with. This is essential for ensuring that the signal is correctly transmitted and not degraded or distorted by the impedance mismatch between the field device and the isolation barrier.

4. Signal Isolation:

   • The MTL 722+ isolates control signals to prevent interference, ground loops, or power surges from affecting the system. This is particularly crucial in hazardous environments where the equipment must be safeguarded against potential faults that could lead to explosions or fires.
   • It also helps with communication between different systems that require electrical isolation.

5. Intrinsic Safety (IS):

   • As an intrinsically safe device, the MTL 722+ is designed to ensure safe operation in environments where there is a risk of explosive gases, vapors, or dust. It helps to limit the electrical energy in circuits to a safe level that won’t ignite any flammable materials.

6. Applications in Hazardous Areas:

   • Chemical, oil & gas, petrochemical, and pharmaceutical industries: These areas often have explosive or hazardous atmospheres where intrinsically safe systems are required.
   • The MTL 722+ barrier can be used to protect systems such as sensor loops, transmitters, or control circuits that are connected to field devices in dangerous zones.
   • The device is often used in process control systems, fire and gas detection systems, and other safety-critical applications in hazardous environments.

7. Safety Certifications:

   • The MTL 722+ is certified for use in hazardous areas, meeting ATEX, IECEx, and other international intrinsic safety standards.
   • The device is built to be compliant with the required explosion-proof or flameproof standards, ensuring protection against sparks and electrical faults.

Functionality:

• Signal Conditioning and Protection:
  • The MTL 722+ is a safety barrier that ensures the signals from field devices like pressure transmitters, temperature sensors, or flowmeters are transmitted safely to the control room or system, with isolation between the hazardous and non-hazardous parts of the system.
  • It clamps voltages to a safe level, preventing spikes or electrical disturbances from propagating through the system.
• Reduces Risk of Faults:
  • By providing signal isolation, it minimizes the risk of electrical faults, ground loops, and interference from affecting the equipment, which is particularly critical in hazardous environments.

Benefits of Using the MTL 722+ in Hazardous Areas:

1. Intrinsically Safe Design: Ensures safe operation in explosive environments by preventing hazardous electrical faults.
2. Signal Isolation: Keeps sensitive control equipment safe from interference, voltage spikes, or ground loops.
3. Protection from Electrical Faults: The diode-based design protects against potentially damaging electrical disturbances.
4. Compliance with Standards: Meets industry safety standards like ATEX, IECEx, and others for operation in hazardous areas.

Common Applications:

• Explosion-Proof Zones (Zone 0, Zone 1, Zone 2): For systems in locations with explosive gases or dust where safety barriers are required to prevent ignition.
• Sensor Isolation: Protects sensors and other field devices from electrical faults that could cause system failures.
• Control Systems: Safeguards signals in industrial control systems where equipment is located in or near hazardous areas.
• Safety Instrumented Systems (SIS): Used in SIS for critical safety monitoring and control.