The temperature controlleris an intelligent device used for monitoring and regulating the temperature of the target environment or equipment. Its core consists of a temperature collection module (containing components such as thermocouples and thermoresistors), a microprocessor, an execution output module (containing relays and frequency converters), and a human-machine interaction interface. It collects real-time temperature data, compares it with the set value, and automatically adjusts the heating/cooling equipment to maintain stable temperature. It is widely used in industrial production (such as reaction vessels, ovens), food processing (refrigeration / baking), laboratories, and homes (air conditioners, underfloor heating), and is suitable for different temperature control requirements ranging from -200℃ to 1800℃.

Product Features
Precise Temperature Control: Utilizing the PID intelligent algorithm, the temperature control error can be as low as ±0.1℃, with a fast response speed and the ability to prevent excessive temperature fluctuations.
Rich functions: Supports multi-stage program temperature control, temperature alarm (over-temperature / malfunction), some models also have data storage and communication functions, and can be linked to the upper computer.
High adaptability: Compatible with various sensing components, with flexible output methods, capable of connecting with different execution devices such as heating tubes and refrigerators.
Operation is simple: Equipped with a liquid crystal display and buttons, the parameter settings are clear and intuitive. Some models support touch screens or remote control, and the maintenance cost is low.

The integrated digital temperature transmitter is an instrument that converts industrial thermocouple and thermoresistance signals into standard output signals. It adopts a two-wire transmission mode and can be directly installed in the junction box of thermocouples and thermoresistors. It has features such as shock resistance, moisture resistance, and strong anti-interference ability, and is widely used in fields such as metallurgy, petroleum, and chemical industry.

1. It adopts a silicone rubber or epoxy resin sealing structure, thus being resistant to shock and moisture and suitable for installation and use in harsh on-site environments.
2. It is installed in the junction boxes of thermocouples and thermoresistors for on-site use. It directly outputs 4 - 20mA and 0 - 10mA signals for transmission. This not only saves the expensive cost of compensation wires but also enhances the anti-interference ability of the signal during long-distance transmission.
3. The thermocouple transmitter has the function of automatically compensating for the cold junction temperature.
4. High precision, low power consumption, wide operating temperature range, and stable and reliable performance.
5. Wide application range. It can be integrated with thermocouples and thermoresistors to form an on-site installation structure, and can also be used as a functional module in detection equipment and on the instrument panel.
6. The intelligent temperature transmitter can be adjusted according to the actual needs of the user to change the display direction. It can also display the measured medium temperature, the change in sensor value, the output current, and the percentage.

Working principle
The thermocouple or thermoresistor sensor converts the measured temperature into an electrical signal, and then this signal is sent to the input network of the transmitter. This input network includes circuits such as zero adjustment and thermocouple compensation. After zero adjustment, the signal is input to the operational amplifier for signal amplification. The amplified signal is processed by a V/I converter and output as a 4 - 20mA DC current; the other path is processed by an A/D converter and sent to the display head. The linearization circuit of the transmitter has two types, both using feedback mode. For the thermocouple sensor, the multi-segment linear approximation method is used, and the non-linear correction circuit is employed for correction. For the thermoresistor sensor, the multi-segment linear approximation method is used for correction. There are two display modes for the integrated digital display temperature transmitter. The LCD display temperature transmitter outputs in two-wire system, and the LED display temperature transmitter outputs in three-wire system.