系统内部的干扰

　　主要由系统内部元器件及电路间的相互电磁辐射产生，如逻辑电路相互辐射及其对模拟电路的影响，模拟地与逻辑地的相互影响及元器件间的相互不匹配使用等。

　　变频器干扰

　　一是变频器启动及运行过程中产生谐波对电网产生传导干扰，引起电网电压畸变，影响电网的供电质量;二是变频器的输出会产生较强的电磁辐射干扰，影响周边设备的正常工作。

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foxboro 801ea-wcr-pjgfna-a 1/2in magnetic flowtube 8000a 1/2npt 68707

foxboro 801ha-wcr-pjgfgz nspp 801hawcrpjgfgz

foxboro 801sa-wcr-pjgfna-a magnetic flowtube 8000a 

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foxboro 8120 magnetic flow instrument calibrator s/n 1189526, 115 volts, 

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foxboro 8121a current calibrator, vac 118, hz 60, fuse 25a

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foxboro 821al-dc1cm2-m intelligent transmitter 

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foxboro 821gm-dk1nm1-m intelligent transmitter, ref 95312027, 

foxboro 821gm-dk1nm2 pressure transmitter, output 4-20ma

foxboro 821gm-ds1nh2-m intelligent transmitter 600 psi

foxboro 821gm-hs1nh2-m electric transmitter 600psi 

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foxboro 821gm-is1sm1-cm pressure 12.5-65v-dc 0-100psi transmitter d206907

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foxboro 823dp-i3k1nm1 12.5-65 vdc 3000 psi eletronic transmitter, nib

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foxboro 823dp-i3k1nm1-y uspp 823dpi3k1nm1y

foxboro 823dp-i3k1nm2 uspp 823dpi3k1nm2

foxboro 823dp-i3k1nm2-am uspp 823dpi3k1nm2am

foxboro 823dp-i3k1sm1-s transmitter 823dpi3k1sm1s 

foxboro 823dp-i3knm2 uspp 823dpi3knm2

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foxboro 823dp-i3s1nh2-a pressure 12.5-65v-dc 0-100in-h2o transmitter d207066

foxboro 823dp-i3s1nh2-a pressure 12.5-65v-dc 0-15psi transmitter d207077

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foxboro 823dp-i3s1nm2 differential pressure 0-100in-h2o transmitter d207064

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foxboro 823dp-i3s1sl2-c pressure transmitter 3000psi 5in h2o 74546

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foxboro 823eb-im3sc4kd-ma differential pressure transmitter with 2 53872

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foxboro 823ep-im4sb6kd-m 4" pressure transmitter cell