MTL 4544 Dual-Channel Intrinsically Safe 4-20mA HART Repeater Power Supply

Technical Specifications

Input Parameters
- The input signal range for the hazardous area covers 0 to 24mA, which includes over-range signals. It supplies a 16.5V voltage to the transmitter when the current reaches 20mA.
- It is compatible with 2-wire or 3-wire transmitters. Separately powered current sources like 4-wire transmitters can also be connected, but HART communication is not available for such connections.
Output Parameters
- The safe-area output signal ranges from 4 to 20mA, with an under/over-range of 0 to 24mA. For the MTLX544 variant, the safe-area load resistance can be 0 to 360Ω at 24mA and 0 to 450Ω at 20mA.
- The MTLX544S variant acts as a current sink with a maximum safe-area load of 600Ω and supports a maximum voltage source of 24V DC. The safe-area circuit has an output resistance exceeding 1MΩ and a ripple of less than 50µA peak-to-peak.
Accuracy and Response Performance
- The transfer accuracy is better than 15µA at 20°C, and the temperature drift is less than 0.8µA/°C, ensuring minimal signal distortion due to temperature changes.
- The module settles to within 10% of the final value within 50µs, enabling rapid response to changes in the transmitter’s input signals.

Category: Others

Description

- Power Supply and Power Consumption
  - The power supply voltage range is 20V DC to 35V DC. At 24V DC with 20mA signals, the maximum current consumption is 96mA.
  - The power dissipation of the MTLX544 variant is 1.4W at 24V DC, while the MTLX544S variant has a power dissipation of 1.9W at the same voltage and signal conditions.
- Safety and Physical Specifications
  - For each channel, the safety parameters include an open-circuit voltage of 28V, a short-circuit current of 93mA, and a maximum output power of 651mW, with a maximum voltage of 253V RMS or DC.
  - It has dimensions of 1.58cm in width, 10.98cm in height, and 12.36cm in depth, with a weight of approximately 0.11kg, and is equipped with a green LED for power indication.
Functional Features
- Dual-Channel Independent Operation
  - The dual-channel design allows the module to power two transmitters and transmit their signals independently. This design not only improves the efficiency of equipment deployment but also prevents mutual interference between the two signal loops, ensuring the stability of each transmission path.
- Seamless HART Communication Support
  - It supports HART communication through terminals 1&2 and 4&5 for the two channels respectively. Operators can perform remote configuration, calibration, and diagnostic operations on HART smart transmitters in hazardous areas from the safe area, eliminating the need to enter dangerous sites.
- Strong Functional Safety Performance
  - It meets relevant functional safety standards and can achieve SIL2 compliance when used as a single device. When configured in a redundant setup, it can meet SIL3 requirements, which is applicable to industrial scenarios with high safety integrity demands.
- Stable and Low-Noise Signal Transmission
  - With high transfer accuracy and low temperature drift, the module ensures that the signals transmitted to the safe area truly reflect the data detected by the hazardous-area transmitters. The extremely low output ripple of the safe-area circuit avoids signal interference and lays a foundation for accurate industrial control.
Application Scenarios
- Oil and Gas Industry
  - It is installed on offshore oil platforms and onshore refineries to power and transmit signals for pressure, flow, and temperature transmitters in Zone 0 hazardous areas. It enables remote diagnosis and parameter adjustment of transmitters via HART communication, ensuring the safe and stable operation of oil extraction and refining processes.
- Chemical and Petrochemical Plants
  - It is applied in production lines involving flammable and corrosive media. It connects transmitters on reaction kettles, storage tanks, and pipelines with the DCS system in the safe area. It guarantees reliable transmission of process parameters such as concentration and pH value and supports emergency parameter modification to avoid accidents.
- Pharmaceutical Manufacturing
  - In pharmaceutical workshops requiring strict process control, it is used to connect temperature and pressure transmitters in sterile and potentially hazardous production areas. Its intrinsic safety design eliminates the risk of sparks that could contaminate the sterile environment, and accurate signal transmission ensures that production parameters meet pharmaceutical quality standards.
- Power Generation Industry
  - In coal-fired power plants and gas-fired power stations, it is deployed in hazardous areas such as boiler rooms and turbine rooms. It provides power and transmits signals for gas concentration and temperature transmitters, allowing the central control system to monitor equipment operating status in real time and conduct remote maintenance of transmitters.
- Water and Wastewater Treatment
  - It is used in wastewater treatment plants where explosive gas may be generated during the treatment process. It connects transmitters that monitor parameters such as dissolved oxygen and pollutant concentration with the control system in the safe area. It ensures continuous and stable signal transmission, helping to maintain the normal operation of the treatment process and meeting environmental protection emission standards.

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