ABB NTU-7A0/E Thermocouple Termination Unit

ABB NTU-7A0/E Thermocouple Termination Unit

Overview of the NTU-7A0/E

Series: belongs to ABB's NTU series, which provides a variety of solutions for signal connection and processing in industrial automation control systems, NTU-7A0/E focuses on thermocouple signal processing.

Applications: Widely used in chemical, electric power, metallurgy, pharmaceutical and other industries, suitable for a variety of industrial applications requiring accurate temperature measurement and control, often used in conjunction with thermocouple sensors to ensure that the system can accurately monitor and control temperature parameters.

Functional features

Signal Processing and Transmission: Multiple thermocouple input channels are provided for connecting multiple thermocouple sensors to achieve simultaneous monitoring of multiple temperature points. These channels have good electrical insulation properties, which can effectively prevent signal interference and short-circuit, and ensure stable signal transmission to the control system.

Signal conditioning function: the input thermocouple signal amplification, filtering and other conditioning operations. The amplification function can enhance the weak thermocouple signal and make it easier for subsequent processing and transmission; the filtering function can remove the noise and interference components in the signal to ensure the accuracy of the signal, thus improving the precision of temperature measurement.

Cold End Compensation Mechanism: The built-in cold end compensation circuit can automatically compensate for changes in the temperature of the cold end of the thermocouple. This function is essential to ensure the accuracy of temperature measurement, regardless of the ambient temperature, can make the measured value accurately reflect the actual temperature.

Signal Conversion and Output: The processed thermocouple signal can be converted to a standard analogue or digital signal output for compatibility with different devices such as controllers, recorders, monitors, etc. Common output signal types include 4-20mA current signals, 0-10V voltage signals, or signals that comply with digital communication protocols such as Profibus and Modbus.

Diagnostic and Alarm Function: With self-diagnostic function, it can monitor its own working status and the abnormal situation of input signals in real time. Once there is a signal open circuit, short circuit, over range and other faults, the module will immediately send out the corresponding alarm signal to remind the user to deal with it in time, which effectively improves the reliability and safety of the system.

Technical parameters

Input parameters: support a variety of common thermocouple graduation number, such as K type, J type, T type, E type, etc., to meet the requirements of different application scenarios on the temperature measurement range and accuracy. The millivolt range of the input signal corresponds to the supported thermocouple types, for example, the millivolt range of K-type thermocouple is about - 5mV to + 50mV.

Output Parameters: The output signal type can be configured according to the user's needs, such as 4-20mA current signal output, the load resistance can generally support a range of 0-500Ω or greater; 0-10V voltage signal output, the output impedance is low, to ensure that the signal driving ability. The digital signal output complies with common industrial communication protocols.

Accuracy and Resolution: Temperature measurements are highly accurate, typically between ±0.1°C and ±0.5°C, depending on the type of thermocouple used, the measurement range, and calibration. The resolution of the signal conversion is also high and can accurately reflect small changes in temperature, for example, for a 4-20mA current signal output, the resolution may be 0.01mA or higher.

Response time: the response time is fast, generally between milliseconds to seconds, the thermocouple can be measured in a timely manner to convert the temperature changes in the output signal to meet the real-time requirements of the industrial process of temperature monitoring.

Power requirements: the power supply is usually a DC power supply, the voltage range is generally between 18V and 30V DC, the power supply power consumption is low, generally in a few watts to a dozen watts or so, the specific power consumption depends on the module configuration and operating conditions.

Environmental parameters: a wide range of operating temperatures, generally - 20 ℃ to + 70 ℃ or so, some models may support a wider range of temperatures, to adapt to a variety of harsh industrial field environment. The relative humidity range is generally 5% to 95% (non-condensing), with good moisture resistance.