MTL 4516 Dual-Channel Hazardous-Area Switch

Technical Specifications

Input Parameters
- It accepts inputs from Namur proximity detectors and mechanical switches, and applies an input voltage of 7 – 9V DC with a resistance of 1kΩ ± 10%.
- The trigger threshold is set at above 2.1mA to close the relay and below 1.2mA to open the relay, with a hysteresis of 200µA and a nominal resistance of 650Ω.
Output Parameters
- It is equipped with changeover relay contacts, and the relay has a resistive load rating of 0.5A at 35V DC, which can stably drive the corresponding safe – area loads.
- The response time of the module is no more than 10ms, ensuring rapid response to signal changes from on – site sensors.
Power Supply and Isolation
- The power supply voltage ranges from 20V DC to 35V DC, and the power consumption is 35mA at 24V DC, which is equivalent to 0.84W, presenting low power consumption performance.
- It provides 250V AC galvanic isolation between the input, output and power circuits to avoid mutual interference between different circuits.

Category: Others

Description

- Environmental and Physical Specifications
  - The operating temperature range is – 20°C to + 70°C, and the storage temperature ranges from – 40°C to + 85°C, adapting to most extreme industrial temperature conditions.
  - It can work normally in an environment with 0 – 95% relative humidity without condensation, and its ingress protection level reaches IP66, with a compact size of 114mm × 17.5mm × 119mm and a weight of approximately 120g.
Functional Features
- Dual – channel Independent Control
  - The dual – channel design enables the module to independently process signals from two sets of sensors and control two corresponding safe – area loads without mutual interference. This design improves the efficiency of the module and allows it to handle two sets of monitoring or control tasks simultaneously in the same installation position.
- Intelligent Line Fault Detection
  - It is equipped with a built-in line fault detection function that can identify open – circuit and short – circuit faults in field wiring. An open – circuit is detected when the input current is less than 50µA, and a short – circuit is detected when the input resistance is less than 100Ω. Each channel is equipped with an LED alarm indicator, which allows maintenance personnel to quickly locate fault points and shorten downtime.
- High Safety Compliance
  - It meets the certification requirements for Zone 0/IIC T6 and Division 1 Group A hazardous areas. It can operate safely and stably in explosive and other high-risk environments without additional explosion-proof protection devices, which fundamentally guarantees the safety of the industrial production process.
- Easy Installation and Maintenance
  - It complies with EN 60715 standards for DIN – rail installation, which is convenient and fast to install. The phase reversal of each channel can be selected through the side switch of the module, and the LED fault indicators make daily inspection and troubleshooting intuitive and simple, reducing the difficulty of later maintenance.
Application Scenarios
- Oil and Gas Facilities
  - It is applied in emergency stop circuits of onshore refineries and offshore oil platforms. It connects the proximity sensors that monitor the position of key valves and the emergency stop switches on the platform with the control loads in the safe – area central control room. When dangerous situations occur, it can quickly transmit signals to cut off relevant equipment, ensuring the safety of personnel and facilities.
- Chemical Plants
  - It is used in safety interlock systems of chemical production workshops. It connects the switches and proximity detectors installed on reaction kettles, pipelines and storage tanks with the alarm and shutdown loads in the safe area. When abnormal pressure, temperature or material level is detected, it can trigger alarms and start protective shutdown procedures in a timely manner.
- Material Conveying Systems
  - In large – scale logistics warehouses and industrial material conveying lines, it is used for conveyor belt proximity monitoring. It links the sensors that detect the running state of conveyor belts and the position of materials with the motor and brake loads of the conveyor belt. When material blockage or belt deviation is detected, it can control the conveyor belt to stop running quickly.
- Tank Level Control
  - In the storage areas of petrochemical, chemical and other industries, it connects the liquid level switches installed on storage tanks with the control loads of feeding pumps or discharge valves. It controls the start and stop of the pumps and valves according to the liquid level signals, realizing automatic liquid level control and preventing overflow or dry – running accidents.
- Machinery Manufacturing Workshops
  - It is integrated into the safety monitoring system of mechanical processing equipment. It matches the safety door switches and workpiece proximity sensors of machine tools with the power loads of the machine tools. When the safety door is not closed or the workpiece is placed incorrectly, it can cut off the power of the machine tool to avoid safety accidents during processing.

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