The temperature transmitter is a field measuring instrument for contact temperature measurement. It can be used with the measuring element to convert the temperature or temperature difference signal into a uniform standard signal output. It can also convert other process parameters that can be converted into a DC millivolt signal. It becomes the corresponding unified standard signal output, realizing the display, recording and automatic control of temperature parameters. The mortals can be accurately used to measure the temperature of various mediums or objects in the process of production tasks (with the limitation of -200°C to 1600°C). The thermal resistance changes by sensing the temperature transition to a resistance value. The temperature transmitter adopts silicone rubber or epoxy resin sealing structure, so it is shock-resistant, moisture-resistant and suitable for use in harsh field conditions.
Temperature Transmitter Features: The use of low drift, high gain integrated operational amplifier, the reliability and stability of the instrument has been improved; in the thermocouple and thermal resistance temperature transmitter set the linearization circuit, so that transmission The linear relationship between the output signal of the device and the measured temperature improves the accuracy of the transmitter and facilitates the indication and recording; the safety spark-proof type measures are adopted in the line, and the DC/AC/DC (DC/AC/DC) is increased. The converter part has the function of the safety barrier, so it can measure the DC millivolt signal and temperature signal from the dangerous place; it can be directly installed in the sensor junction box, the signal is accurate, remote transmission (up to 1000M), accuracy High, anti-disturbance, good long-term stability, maintenance-free. This series of products has been widely used in various areas of industrial control.
The temperature transmitter needs to pay attention to its characteristics, such as: the difference in temperature drift: in addition to the basic accuracy of temperature measurement instruments, there are some factors that affect the accuracy of the instrument, such as the change in the working environment caused by the decline in the accuracy of the instrument, the amount of influence This is called the temperature drift of the meter. This influence is an important indicator of the instrument. The smaller the temperature drift, the higher the measurement accuracy of this instrument is, and it is less affected by changes in the ambient temperature. If the temperature transmitter has the same temperature drift indicator as the digital temperature meter. However, the internal temperature rise of the digital display instrument is greater than that of the temperature transmitter during temperature measurement. Therefore, the effect of the temperature drift of the temperature transmitter on the total accuracy of the instrument is far less than that of the digital temperature display instrument.
Difference in service life: The service life of the 4-20mA two-wire temperature transmitter is much longer than that of the digital temperature meter. The digital power meter's power supply is extremely hot and can easily fail.
The difference in accuracy: The accuracy of the temperature transmitter is 0.1%, while the accuracy of the digital display is usually 0.5%. Obviously, the accuracy of the temperature transmitter is 5 times higher than that of the digital display.
The difference in the cost of electricity: temperature transmitter power consumption is less than one-tenth of digital temperature meter, each year is estimated to be more than 40 degrees power meter temperature measurement instrument.
The difference in price: usually the price of the temperature transmitter is higher than the price of the digital temperature meter, but the digital temperature meter must be equipped with a protection box in the field, and in order to meet the protection requirements, we must be able to see the value. Only transparent glass can be added. This also adds a lot of cost. There are also digital meters that are not two-wire instruments. They require an independent 220V power supply. Then you have to pull a power cord from a remote control room and install air. Switching and other safety measures, the overall cost is not low, but increased a lot.
The difference between installation, maintenance and repair: The temperature transmitter terminal is less than the digital temperature measuring instrument, and the installation and maintenance are convenient. Therefore, the expenses in this area are also saved.
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