Temperature transmitter

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Temperature transmitter is a kind of converting temperature variables can transmit the standardizati…

One. Product overview

Temperature transmitter is a kind of converting temperature variables can transmit the standardization of the output signal of the instrument.Temperature transmission function is mainly used for industrial process measurement and control of the temperature parameters.With sensor transmitter usually consists of two parts: sensor and signal converters.The sensor is mainly the thermocouple or heat resistance;Signal converter mainly consists of measurement unit, signal processing and conversion unit (due to the thermal resistance and thermocouple indexing table used in industry are standardized, so the signal converter as a separate product is called the transmitter), some transmitter increases the display unit, some also have the function of field bus.

2. Key features:
Adopt silicon rubber, or epoxy resin sealing structure, so the shock resistance, resistance to wet, suitable for installation on site environment;

Low installation in thermocouple, heat resistance of the terminal box use, direct output 4-20 ma, 0 to 10 ma output signal.Such already save expensive compensation conductor, and improve the anti-interference ability in the process of signal transmission over a long distance;

Low thermocouple transmitter with functions of automatic cold junction compensation;High precision, low power consumption, the use of wide temperature range, stable and reliable work;

And low applicability is wide and the thermocouple, heat resistance integrated installation structure formation, can also be used as a functional modules installed on the testing equipment and instrument panel using:

3. Working principle

The thermocouple or heat resistance sensor is a temperature conversion into electrical signals, then send signals to the input of network in the transmitter, the network contains zero and thermocouple compensating circuit.After zero input signals to the operational amplifier for signal amplification, amplified signal by V/I converter after processing to a DC4-20 ma current output;Another through A/D converter after processing to display meter.There are two kinds of the linearization of the transmitter circuit, adopt feedback way.Correction on the thermal resistance sensors, with positive and negative way, the thermocouple sensor, with multiple line approximation method for correction.Integrated digital display temperature transmitter LCD display way of using two wire system output.

4. Technical parameters

1. The input signal: thermocouple: K, E, J, B, S, T, N;Thermal resistance: Pt100, Cu50, Cu100, (three-wire system, four wire), intelligent temperature transmitter of the input signal can be set up by PC or hand operator arbitrary;
2. The output signal: within the range output DC4-20 ma current signal, and the thermocouple, heat resistance of the input signal into a linear or linearly to the temperature.Intelligent temperature transmitter output DC4-20 ma current signal superposition accord with standard of HART protocol communication signals at the same time;
3. The basic error: 0.5% FS.0.2% FS.Intelligent 0.2% FS.
4. Connection mode: the two wire;Three wire system;
5. Display mode: four LCD display temperature, four intelligent LCD by PC or hand operator set to show the scene temperature, sensor value, any kind of parameters of the output current and the percentage rate;

6. Working voltage: ∽ 35 normal 12 v DC;Intelligent ∽ 45 v DC 12 v;The rated working voltage of 24 v DC;
7. Allow the load resistors: 500 Ω (24 VDC power supply);The limit load resistance R (Max) = 50 (Vmin - 12), for example, in the rated working voltage 24 v DC, load resistance may choose to use a 0-600 Ω scope.

8. The working environment:
A: the environment temperature 25 ∽ 80 ℃ (regular)
70 ℃ and 25 ∽ type (display)
B: 5% relative humidity is 5% ∽
C: mechanical vibration f 50 hz or less, the amplitude of 0.15 mm or less
D: no corrosion gas or a similar environment;
9. The temperature influence coefficient, the delta / ℃ 0.05% or less