MTL4041B is an analog input safety barrier. The detailed information is as follows:
Single channel, supporting HART communication.
- 4-20mA signal
- Compatible with 2-wire or 3-wire smart transmitters
- 4-20mA current signal with superimposed digital signal
- Minimum output voltage: 15V (at 20mA)
Better than 20μA
Isolation voltage between the safe area and hazardous area: 250V AC
Voltage range: 20-35V DC
1.2W
- Adopts integrated circuit and surface mount technology, featuring high precision and low power consumption.
- Provides fully floating DC power for traditional 2-wire/3-wire 4-20mA transmitters or smart transmitters located in hazardous areas, and replicates the current in a separate circuit to drive loads in the safe area.
- For smart transmitters: This unit enables bidirectional transmission of digital communication signals superimposed on the 4-20mA current signal. This allows the transmitter to be interrogated (e.g., parameter reading, configuration adjustment) from an operator station or a handheld communicator.
- HART Communication: Short for "Highway Addressable Remote Transducer Protocol", an international standard for bidirectional digital communication in industrial fields. It superimposes low-frequency digital signals on the 4-20mA analog signal, enabling simultaneous transmission of process measurement data (analog) and device configuration/diagnostic information (digital) without interfering with analog signal accuracy.
- Fully Floating DC Power: A power supply mode where neither the positive nor negative terminal of the power output is connected to the safety barrier’s base plate or ground. This design avoids ground loop interference between the hazardous-area transmitter and the safe-area load, ensuring stable signal transmission.
- 2-Wire/3-Wire Transmitter:
- A 2-wire transmitter shares power supply and signal lines (the 4-20mA current signal doubles as both the measurement signal and power for the transmitter), with simple wiring.
- A 3-wire transmitter has separate power lines (two wires) and a signal line (one wire), suitable for transmitters with higher power consumption (e.g., some smart transmitters with advanced diagnostic functions).
- Current Replication: The safety barrier does not directly transmit the hazardous-area input current to the safe area. Instead, it uses an isolation circuit (e.g., optocoupler, magnetic isolation chip) to "replicate" an identical 4-20mA current in the safe-area circuit. This ensures electrical isolation between the two areas while maintaining signal consistency.
