What are the working principles and technical parameters of an integrated temperature transmitter?

Working principle of integrated temperature transmitter
Sales Hotline: 0550-7512882. Thermocouples or thermal resistance sensors convert the measured temperature into electrical signals, which are then sent to the input network of the transmitter. This network includes related circuits such as zero adjustment and thermocouple compensation. The zero adjusted signal is input to an operational amplifier for signal amplification. The amplified signal is then 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 displayed in the header. There are two types of linearization circuits for transmitters, both of which use feedback methods. For thermistor sensors, calibrate using positive feedback method, and for thermocouple sensors, calibrate using multi segment line approximation method. The integrated digital display temperature transmitter has two display modes. The temperature transmitter for LCD display outputs using a two-wire system, while the temperature transmitter for LED display outputs using a three wire system.

Main technical parameters of integrated temperature transmitter
1. Input signal: Thermocouple: k,e,j,b,s,t,n. The input signal of the intelligent temperature transmitter can be set arbitrarily through a handheld device and a PC;

2. Output signal: Output a 4-20mA DC signal within the range of measurement, which is linear with the input signal of the thermocouple or thermistor or linear with temperature. The intelligent temperature transmitter outputs a 4-20mA DC signal and superimposes it to comply with the Hart standard protocol for communication; Isolated temperature transmitter: Input and output are isolated, with an isolation voltage of 500V, which increases the ability to resist common mode interference and is more suitable for networking with computers;

3. Basic error: 0.5% fs, 0.2% fs, intelligent type 0.2% fs;

4. Wiring method: two-wire system

5. Display mode: The four digit LCD displays the on-site temperature, and the intelligent four digit LCD can be set through a PC or handheld device to display any of the parameters such as on-site temperature, sensor value, output current, and percentage;

6. Working voltage: ordinary model 12v-35v, intelligent model 12v-45v, rated working voltage is 24V

7. Allowable load resistance: 500 Ω (24VDC power supply); The maximum load resistance r (max) is 50 (vmin-12). For example, at a rated operating voltage of 24V, the load resistance can be selected and used within the range of 0-600 Ω.

8. Work environment: a: Environmental temperature -25-+80 ℃ (conventional type)

-25-+70 ℃ (digital display type)
-25+75 ℃ (intelligent type)
b: Relative humidity: 5% -95%
c: Mechanical vibration f ≤ 50hz, amplitude ≤ 0.15mm
d: No corrosive gas or similar environment;

9. Environmental impact coefficient: δ ≤ 0.05%/℃.