Rail type temperature transmitter

Rail type temperature transmitter

The SBW series thermocouple and thermistor temperature transmitter is a field installed temperature transmitter unit used in conjunction with industrial thermocouples and thermistors. It adopts a two-wire transmission method (two wires serve as a common transmission line for power input and signal output). Convert industrial thermocouple and thermistor signals into 4-20mA and 0-10mA output signals that are linear with the input signal or temperature signal.

This transmitter can be directly installed in the junction box of thermocouples and thermal resistors to form an integrated structure. As a new generation of temperature measuring instrument, it can be widely used in industrial sectors such as metallurgy, petroleum, chemical, power, light industry, textile, food, national defense, and scientific research.

Principle: 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 relevant circuits such as zeroing and thermocouple compensation. The zero adjusted signal is input to an 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 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.

Rail type temperature transmitterTechnical Specifications:

1. Input signal: Thermocouples: K, E, J, B, S, T, N. Thermistor: The input signal of Pt100, Cu100, Cu50 (three wire system, four wire system) intelligent temperature transmitters can be set arbitrarily through a PC or handheld device;

2. Output signal: Output a 4-20mA DC signal within the range, which is linear with the input signals of thermocouples and thermal resistors or linear with temperature. The intelligent temperature transmitter outputs a 4-20mA DC signal while superimposing a communication signal that complies with the HART standard protocol; Isolation type temperature transmitter, with input and output isolated, isolation voltage of 0.5KV, increased resistance to common mode interference, more suitable for computer networking use;

3. Basic error: Intelligent 0.2% FS/0.5% FS, HART 0.1% FS;

4. Wiring methods: Input two-wire system, three wire system, four wire system;

5. Display mode: 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: Intelligent type 8~36 (V), HART type 12~30 (V), rated working voltage is 24V;

7. Allowable load resistance: 600Q (24VDC power supply);

8. Work environment:

a: Environmental temperature

(-20~80) ℃ (intelligent type), (-40~85) ℃ (HART type), (20~80) - ℃ (digital display type)

b: Relative humidity:<85% RH

c: Temperature drift:<50ppm/℃

d: No corrosive gas or similar environment;

9. Temperature influence coefficient: 6<0.05%/C;