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Industry Information
Method for validating integrated temperature transmitter
2012-2-27 12:43:03

一般由测温探头(热电偶或热电阻传感器)和两线制固体电子单元组成。 The integrated temperature transmitter is generally composed of a temperature probe (thermocouple or thermal resistance sensor) and a two-wire solid electronic unit. The solid-state module is used to directly install the temperature measuring probe in the junction box to form an integrated transmitter. Integrated temperature transmitters are generally divided into two types: thermal resistance and thermocouple.
Thermal resistance temperature transmitter is composed of reference unit, R / V conversion unit, linear circuit, reverse connection protection, current limit protection, V / I conversion unit and so on. After the temperature measurement thermal resistance signal is turned to 0 for amplification, the linear relationship between the temperature and resistance is compensated by the linear circuit. After the V / I conversion circuit, a constant current signal with a 4-20 mA linear relationship with the measured temperature is output. .

Thermocouple temperature transmitters are generally composed of circuit units such as reference source, cold junction compensation, amplifier unit, linearization processing, V / I conversion, disconnection processing, reverse connection protection, and current limit protection. It is to amplify the thermoelectric potential generated by the thermocouple through cold junction compensation, then eliminate the non-linear error of thermoelectric potential and temperature by a linear circuit, and finally amplify and convert it into a 4-20mA current output signal. In order to prevent accidents caused by the temperature control failure due to the broken wire in the thermocouple measurement, a power-off protection circuit is also provided in the transmitter. When the thermocouple is broken or disconnected badly, the transmitter will output the maximum value (28mA) to make the meter cut off the power.

The integrated temperature transmitter has the advantages of simple structure, saving leads, large output signal, strong anti-interference ability, good linearity, simple display instrumentation, solid module earthquake resistance and moisture resistance, reverse connection protection and current limit protection, and reliable operation.

The output of the integrated temperature transmitter is a uniform 4-20mA signal; it can be used with a microcomputer system or other conventional instruments. It can also be made into explosion-proof or fire-proof measuring instruments on request.


Integrated temperature transmitter
一般由测温探头(热电偶或热电阻传感器)和两线制固体电子单元组成。 The integrated temperature transmitter is generally composed of a temperature probe (thermocouple or thermal resistance sensor) and a two-wire solid electronic unit. The solid-state module is used to directly install the temperature measuring probe in the junction box to form an integrated transmitter. Integrated temperature transmitters are generally divided into two types: thermal resistance and thermocouple.
Thermal resistance temperature transmitter is composed of reference unit, R / V conversion unit, linear circuit, reverse connection protection, current limit protection, V / I conversion unit and so on. After the temperature measurement thermal resistance signal is turned to 0 for amplification, the linear relationship between the temperature and resistance is compensated by the linear circuit. After the V / I conversion circuit, a constant current signal with a 4-20 mA linear relationship with the measured temperature is output. .

Thermocouple temperature transmitters are generally composed of circuit units such as reference source, cold junction compensation, amplifier unit, linearization processing, V / I conversion, disconnection processing, reverse connection protection, and current limit protection. It is to amplify the thermoelectric potential generated by the thermocouple through cold junction compensation, then eliminate the non-linear error of thermoelectric potential and temperature by a linear circuit, and finally amplify and convert it into a 4-20mA current output signal. In order to prevent accidents caused by the temperature control failure due to the broken wire in the thermocouple measurement, a power-off protection circuit is also provided in the transmitter. When the thermocouple is broken or disconnected badly, the transmitter will output the maximum value (28mA) to make the meter cut off the power.

The integrated temperature transmitter has the advantages of simple structure, saving leads, large output signal, strong anti-interference ability, good linearity, simple display instrumentation, solid module earthquake resistance and moisture resistance, reverse connection protection and current limit protection, and reliable operation.

The output of the integrated temperature transmitter is a uniform 4-20mA signal; it can be used with a microcomputer system or other conventional instruments. It can also be made into explosion-proof or fire-proof measuring instruments on request.


的方法 Method for validating integrated temperature transmitter
1. The temperature transmitter needs to be calibrated after six months of use.
2. The installation environment of the mechatronic temperature transmitter must be within -20- + 70 ℃. When the ambient temperature is too high, the SBWZ / R signal converter and display module can be installed separately from the thermal resistor or thermocouple. Our factory is equipped with a special explosion-proof box with a separately installed transmitter.
3. Before powering on, please check the positive and negative polarity of the power supply carefully. Do not connect it incorrectly, otherwise it may cause unknowable results.
4. The SBW signal converter module is potted and cured with epoxy resin to strengthen its anti-vibration performance and to prevent moisture, corrosion and moisture.
5. When used in explosion hazardous areas, please pay attention to explosion-proof signs and protection levels;
I. Calibration method of thermal resistance temperature transmitter:
1. Equipment requirements: one digital voltmeter;
2. Wiring according to the system connection method;
3. According to the sensor and range indicated on the transmitter nameplate, enter the corresponding resistance value so that the output is 1V and 5V (the zero potentiometer and full-scale potentiometer can be adjusted respectively);
4. Enter the resistance values according to the tenth division of the range, and check whether each temperature output meets the accuracy range;
5. Test according to the technical specifications of the instruction manual, which should meet the technical requirements.
Second, the thermocouple temperature transmitter calibration method:
1. Equipment requirements: one digital voltmeter;
2. Wiring according to the system connection method;
3. According to the sensor and range indicated on the transmitter nameplate, enter the corresponding resistance value so that the output is 1V and 5V (the zero potentiometer and full-scale potentiometer can be adjusted respectively);
4. Input each potential value according to the tenth division of the range, and check whether each temperature output meets the accuracy range;
5. Test according to the technical specifications of the instruction manual, which should meet the technical requirements.