Product brief introduction: integrated digital temperature transmitter using a two-wire transmission mode ( two wires as a power input and signal output to the common transmission line ). Industrial thermocouple, thermal resistance signal is converted to the input signal or and temperature signal into a linear4-20mA,0-10mA output signal.

The temperature transmitter can be mounted directly on the thermocouple, thermal resistance of the wiring box to form an integrated structure with the. It is a new generation of measuring instrument can be widely used in metallurgy, petroleum, chemical, electric power, light industry, textile, food, national defense and scientific research and other industrial sectors.

Main features:

1made of silicone rubber or epoxy resin sealing structure, therefore, resistance to humidity, live in harsh environment, suitable for installation and use.

The 2installation in the thermocouple, thermal resistance junction box, direct output of4-20mA,0-10mA output signal. This saves expensive wire compensation costs, but also improves the signal transmission in the process of anti jamming capability;

3thermocouple transmitter has a cold end temperature automatic compensation function;

4high accuracy, low power consumption, using a wide range of ambient temperature, stable and reliable work;

5wide applicable range, can with a thermocouple, thermal resistance formed integration site installation structure, can also act as a function module is installed on the testing equipment and instrument panel for use;

6 intelligent temperature transmitter through HART modem communications with the host computer or handheld device and with the PC machine on the transmitter model, index number, range of remote information management, configuration, monitoring, calibration and maintenance function of variables;

7 intelligent temperature transmitter according to the actual needs of the user to adjust the display direction transmitter, transmitter and display the measured medium temperature, sensor value changes, the output current and the percentage of;

Working principle.

Thermocouple or thermal resistance temperature measurement sensor will be converted into electrical signals, and sends the signal to the transmitter input network, the network contains zero and thermocouple compensation and other related circuit. The zero after the signal input to the operational amplifier to amplify the signal, amplified through a V/I converter calculates after treatment with 4 20mA direct current output; the other through a A/D converter after treatment to the meter display. Transmitter linearization circuit two, are used in feedback mode. The thermal resistance sensor, with positive feedback correction, the thermocouple sensor, with the polygonal approximation correction method. The integration of digital display of temperature transmitter has two show. LCD display with two wire temperature transmitter output, LED display temperature transmitter three line output.

Technical parameters

In 1, the input signal:: K, E, J thermocouple, B, S, T, N. Heat resistance: Pt100, Cu50, Cu100( three line, four line ). Intelligent temperature transmitter input signal may pass through the handheld device and the PC machine set;

In 2, the output signal: in the range of4- 20mA DC signal output, and a thermocouple or thermal resistance of the input signal into a linear or be linear with the temperature. Intelligent temperature transmitter output DC signal at the same time420mA superimposed accords with the standard HART protocol communication; isolation type temperature transmitter: input and output phase segregation, isolation voltage 500V, increased resistance to common mode interference ability, more suitable for use with computer networking;

3, the basic error:0.5%FS,0.2%FS, intelligent 0.2%FS;

4, connection: the two-wire system, three line, four line system;

Display mode:5, four LCD display field temperature, intelligent four LCD through PC machine or handheld device set to display the temperature, the sensor value, the output current and the percentage of any kind of parameter;

In 7, allowing the load resistance:500 Ω(24VDC power supply ); limit load resistance R ( max ) =50( Vmin-12), for example in the rated voltage24V, load resistance in 0-600Ωrange select.

8, the work environment: a: temperature -25-+80℃(conventional ) ( -25-+70℃-25-+75℃digital display type) ( intelligent )

Relative humidity: b:5%-95%c: mechanical vibration f ≤50Hz≤ 0.15mm, amplitude

D: no corrosive gas or similar environment;

In 9, the environmental impact factor:δ≤ 0.05%/ ℃.