选择的可调式三端稳压器CW317的特性参数为U0=+1.2V～+37V,Iomax=1.5A，最小输入输出压差（Ui-UO）min=3V,最大输入输出压差（Ui-UO）max=40V由式UO=1.25(1+RP1/R1)，取R1=240欧姆，UO=+3V～+9V,则RP1min=336欧姆，RP1max=1490欧姆...
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准确度高，输出压差大，不易堵塞，对流向不敏感。
The uniform speed ring flowmeter has high accuracy, large output differential pressure, uneasy plugging and insensitive current direction.
系统压力或差压变送器信号输出采用HART现场总线协议，数字信号传输通过RS485进行MODBUS通讯。
HART field-bus protocol is used in output of system pressure or differential pressure transmitter, digital signals is transmitted with MODBUS via RS485.
采用差压变送器直接测量流量，输出电流与被测流量将是非线性关系。
By using transducers of differential pressure to measure flux directly, the relation between current output and measured flux will be nonlinear.
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