MTL ICC441 is a single-channel analog input safety barrier. The detailed introduction is as follows:
It supports 0/4-20mA analog signal input and bidirectional HART communication (in transparent transmission mode) simultaneously. It can be used for connecting 2-wire and 4-wire instruments.
- 0/4-20mA Analog Signal Input: Covers the two most common analog signal ranges in industrial scenarios. The 4-20mA range is widely used for transmitters (e.g., pressure, temperature transmitters) as it avoids misjudgment caused by line resistance, while the 0-20mA range is suitable for some special sensors with zero-signal output requirements.
- Bidirectional HART Communication (Transparent Transmission Mode): The safety barrier does not modify or process HART digital signals superimposed on the 4-20mA analog signal. It only isolates and transmits the combined signal, enabling the safe-area control system (e.g., DCS) or handheld communicator to communicate with hazardous-area smart transmitters (e.g., adjusting transmitter parameters, reading diagnostic data) without interfering with analog signal transmission.
- Optical Isolation Technology: It isolates and converts analog signals from the hazardous area before transmitting them to the safe area. This technology electrically separates the hazardous-area circuit, safe-area circuit, and power supply circuit, preventing dangerous energy (such as overvoltage, overcurrent) from entering the hazardous area and ensuring the safety of the entire system.
- Intrinsic Safety Certification: It holds intrinsic safety certification and can be used in explosion-proof Zone 2. Zone 2 is a hazardous area where an explosive gas-air mixture is not likely to occur under normal operating conditions, and if it does occur, it will only exist for a short time — the safety barrier’s intrinsic safety design ensures that even in fault conditions, the energy in the hazardous-area circuit does not exceed the ignition threshold of flammable media.
- Standard Accuracy: ±0.1% FS (Full Scale). This level of accuracy ensures that the signal transmitted to the safe-area control system has minimal deviation from the actual value of the hazardous-area sensor, meeting the precision requirements of industrial process control (e.g., ensuring the error of pressure transmitter signals is within 0.1% of the full measurement range).
- Temperature Drift: ±0.015%/℃. It indicates the change in signal accuracy caused by temperature fluctuations. A low temperature drift (only ±0.015% per degree Celsius) ensures stable signal transmission even in industrial sites with large temperature variations (e.g., outdoor oilfields, high-temperature chemical workshops).
- Response Time: ≤1s (0-90%). This refers to the time required for the safety barrier to output a 90% full-scale signal after the input signal changes from 0 to full scale. A response time of ≤1s ensures timely transmission of rapidly changing process signals (e.g., sudden pressure fluctuations in pipelines).
- Settling Time: ≤3s. It is the time required for the output signal to stabilize within the allowable error range (e.g., ±0.1% FS) after the input signal changes. This parameter ensures that the control system receives a stable signal to avoid misoperation caused by unstable signals.
- Influence of Power Supply Voltage Fluctuation: ±0.1%/250V. It means that when the power supply voltage changes by 250V, the output signal accuracy changes by only ±0.1%, reflecting the safety barrier’s strong anti-interference ability against power supply fluctuations.
- Maximum Explosion-Proof Voltage: 250V AC. This is the maximum voltage that the safety barrier can withstand without losing its explosion-proof performance, preventing insulation damage and explosion risks caused by overvoltage.
- Explosion-Proof Rating Mark: (Exia) IIC.
- "Exia" indicates intrinsic safety type "ia" (the highest level of intrinsic safety, ensuring safety even in two simultaneous faults).
- "IIC" means it is suitable for hazardous areas with Group IIC flammable gases (e.g., hydrogen, acetylene), which have high explosion hazards.
It usually adopts the DIN rail mounting method, which facilitates installation and wiring in industrial control cabinets. DIN rail is a standardized mounting rail widely used in industrial control systems — the safety barrier can be directly clipped onto the 35mm standard DIN rail, eliminating the need for drilling and fixing, and allowing flexible adjustment of the installation position and easy expansion of the system (e.g., adding more safety barriers in the future).
It is widely used in industrial fields such as petroleum, chemical engineering, electric power, and metallurgy. It is used to realize the safe transmission of analog signals between the safe area and the hazardous area. For example, it connects pressure transmitters, temperature transmitters, etc., in the hazardous area, isolates and converts their output analog signals, and then transmits them to the control system (e.g., DCS, PLC) in the safe area. This ensures that process parameters (such as pipeline pressure, reactor temperature) are accurately monitored and controlled while preventing explosion risks caused by electrical faults.
