ABB NTU-7A0 Thermocouple Termination Unit

ABB NTU-7A0 Thermocouple Termination Unit

Basic information

The type number: NTU-7A0 is a specific type designation for this product and is used to accurately distinguish between components with different functions and characteristics within the ABB product line.

The name: Thermocouple Termination Unit specifies that its main function is to act as a termination unit for thermocouple signals, mainly for receiving, processing and transmitting the temperature signals generated by the thermocouple.

Family: Part of ABB's NTU family of signal processing units, which also includes other types of signal termination units and conversion modules, providing comprehensive signal connection and processing solutions for industrial automation systems.

Functional features

Signal Receiving and Processing: Designed for connecting many types of thermocouple sensors, it can receive thermocouple signals of different graduation numbers, such as K-type, J-type, T-type, E-type and other common types, and amplify and filter these weak millivolt signals in order to enhance the signal strength, improve the quality of the signal, and ensure the accuracy of the subsequent transmission and processing.

Cold End Compensation: Built-in cold end compensation circuitry automatically compensates for changes in the temperature of the cold end of the thermocouple. As the measurement principle of thermocouple is based on the thermoelectric effect, the change of the cold end temperature will affect the measurement accuracy, and the cold end compensation function of the unit can effectively eliminate this effect, to ensure that the measurement results accurately reflect the actual temperature.

Signal Conversion and Output: The processed thermocouple signal can be converted to standard analogue or digital signal output to meet the input requirements of different control systems or equipment. Common output signal types include 4-20mA current signals, 0-10V voltage signals, or signals compliant with digital communication protocols such as Profibus, Modbus, etc., allowing for seamless connectivity with controllers, recorders, displays, and other devices.

Channel Configuration: Usually provide multiple input channels, can be connected to multiple thermocouple sensors at the same time, to achieve centralised monitoring and processing of multiple temperature measurement points, suitable for complex industrial process control systems that need to monitor the temperature of multiple parts.

Diagnostic and alarm function: with self-diagnostic capability, it can real-time monitor its own working status and the abnormalities of the input signal. When there is a thermocouple open circuit, short circuit, signal out of range and other faults, it can send out an alarm signal in time to remind the user to carry out the corresponding processing, which helps to improve the reliability of the system and maintenance efficiency.

Technical parameters

Input parameters: support a variety of thermocouple divisions, the input millivolt range corresponds to the type of thermocouple supported, generally between a few millivolts and tens of millivolts, for example, the input millivolts of K-type thermocouples ranges from about - 5mV to + 50mV or so.

Output Parameters: The output signal type can be flexibly configured, 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, with a lower output impedance to ensure that the signal driving ability. Digital signal output is in line with common industrial communication protocols, with high data transmission rate and anti-interference ability.

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 reach 0.01mA or higher.

Response time: the response speed 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.

Applications

Widely used in chemical, electric power, metallurgy, pharmaceutical, food and beverage and many other industries in the industrial automation control system, used to accurately measure and control the temperature parameters of various production processes, to ensure the stability of the production process, product quality consistency and safe operation of equipment.