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