Surge protection for 4-20mA sensors and data logger?
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Posted by on April 11, 2007, 5:28 am
Please log in for more thread options Hi all! For my grandpa's country I am going to install tens of 4-20mA sensors, which will be routed through some hundreds meters of good cable to the data logger, at the border of the house. To give some (yes, I know it's impossible to give total) protection against nearby lightings, etc.. I thought about adding surge protection. If I understand it right, I should put one device in parallel with each sensor, and another device in parallel with each data logger input (i.e. the two ends of each cable), right? Varistors, gas-dischargers, etc.. to me it seems that a Transil diode may be a very cheap solution but a very effective one nonetheless. Am I wrong? And, being there two in parallel for each cable (one at the sensor and the other at the data logger input), are they going to false the results by much? I am aiming at 16bit resolution, with a full scale precision of about 0.1% Thank you! Andrea | ||||||||||
