FANUC A16B-1211-0060 把4,20变换为010,的电路6.这个电路虽然比较复杂,但性能稳定可靠。
设上的压降纟取样电压彡为,经推导可以得到流经上的电流为1=厂。很显然,如果变送器在零位时输出4mA,在250,的取样电阻的压降为,于是1=0.如果变送器输出为20mA,Vi=5V,则I=5lR,适当选取可得。2.3双4,20,输出有时为应用方便,个变送器需用两个或多个4,20输出。7给出了在实际应用中很成功的解决方法。
FANUC A16B-1211-0060 成,调解,使其输出为4,20岫,就成了双4,20输出。这个电路输出稳定可靠。
3结语电路以及各种变送器的变换电路是作者实际工作的总结,用该方法设计的液位变送器,经多年的实际应用,证明用该设计方法制作的变送器性能优良运行可靠。
2变送器输出的变换利用,295放大器的变换电路,295为双运放电路,噪声低,精度高,叫输入和输出正负信号。单电源工作3,36,低失调电压300高开环增益1000,每个放大器的电源电流最大为1504,输出电流±18,工作温度40,125是种很好的放大器。
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