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| Characteristics of sensors and transmitters (1) |
| 2011-7-25 10:29:46 |
Characteristics of sensors and transmitters (1)
一体化温度变送器一般由测温探头（热电偶或热电阻传感器）和两线制固体电子单元组成。 1. Integrated temperature transmitter generally consists of a temperature measuring 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. 热电阻温度变送器是由基准单元、R/V 转换单元、线性电路、反接保护、限流保护、V/I转换单元等组成。 2. 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 measuring thermal resistance signal is converted and amplified, the non-linear relationship between temperature and resistance is compensated by the linear circuit. After the V / I conversion circuit, a constant current signal of 4 to 20 mA linearly related to the measured temperature is output. 热电偶温度变送器一般由基准源、冷端补偿、放大单元、线性化处理、V/I转换、断偶处理、反接保护、限流保护等电路单元组成。 3.Thermocouple temperature transmitter is generally composed of circuit units such as reference source, cold junction compensation, amplification 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, and then eliminate the non-linear error of thermoelectric potential and temperature by a linear circuit. Finally, it is amplified and converted into a 4-20mA current output signal.
为防止热电偶测量中由于电偶断丝而使控温失效造成事故，变送器中还设有断电保护电路。 4. In order to prevent accidents caused by temperature control failure due to the broken wire in the thermocouple measurement, a power-off protection circuit is also provided in the transmitter.
当热电偶断丝或接解不良时，变送器会输出最大值（28mA）以使仪表切断电源。 5. When the thermocouple is broken or the connection is bad, the transmitter will output the maximum value (28mA) to make the meter cut off the power.
一体化温度变送器具有结构简单、节省引线、输出信号大、抗干扰能力强、线性好、显示仪表简单、固体模块抗震防潮、有反接保护和限流保护、工作可靠等优点。 6. 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. 一体化温度变送器的输出为统一的 4～20mA 信号；可与微机系统或其它常规仪表匹配使用。 7. 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.
( Characteristics of sensors and transmitters (2) To be continued)