Integrated temperature transmitter classification and principle
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How is the integrated temperature transmitter classified? What is its principle? The integrated temperature transmitter has many advantages, including simple structure, large output signal, strong anti-interference ability, simple display instrument, solid module moisture resistance, reverse connection protection and current limiting protection, and reliable operation.
The output of the integrated temperature transmitter is a unified 4-20mA signal; it can be used in conjunction with a microcomputer system or other conventional instruments. Can also be made according to user requirements explosion-proof or fire-resistant measuring instruments.
Integrated temperature transmitter classification and principle. The integrated temperature transmitter generally consists of a temperature probe (thermocouple or RTD sensor) and a two-wire solid electronic unit. The solid-state module is used to mount the temperature probe directly in the junction box to form an integrated transmitter. The integrated temperature transmitter is generally divided into two types: thermocouple and thermal resistance.
The thermocouple temperature transmitter is generally composed of a reference source, a cold junction compensation, an amplifying unit, a linearization process, a V/I conversion, a burnout processing, a reverse connection protection, and a current limit protection circuit unit. It is the thermal potential generated by the thermocouple through the cold junction compensation and amplification, and then cap the linear circuit to eliminate the non-linear thermal potential and temperature error, and finally amplified into 4 ~ 20mA current output signal. In order to prevent accidents caused by temperature control failure due to galvanic disconnection in thermocouple measurement, a power failure protection circuit is also provided in the transmitter. When the thermocouple breaks or fails to connect properly, the transmitter will output the maximum value (28mA) to make the meter cut off the power. [Integrated temperature transmitter classification and principle]
Thermal resistance temperature transmitter is composed of R/V conversion unit, reference unit, reverse connection protection, linear circuit, current limiting protection, V/I conversion unit and so on.
After the temperature-resistor resistance signal is converted and amplified, the linear circuit compensates the nonlinear relationship between temperature and resistance. After the V/I conversion circuit, a constant-current signal of 4-20mA linearly related to the measured temperature is output.
Solar traffic lights rely on the sun's energy to ensure the normal use of signal lights, it USES solar energy, save electricity and environmental protection, installed without the need for laying cables. The signal lamp has the power storage function, which can guarantee the normal work for 10-30 days. Solar energy products are free from the constraints of power lines and can be installed at any time on the road where the sun can shine, which is suitable for all-weather operation. The biggest advantage of solar energy is its convenient mobility and flexibility. The use of solar pv power does not require external power supply, the construction and installation cycle is short, which is convenient to carry, and can be used alone in any place requiring warning and reminder. It can meet the needs of traffic police in dealing with emergency power cut, power cut and other emergencies.