Signal attenuation issue due to excessive length of control cable
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There are several 4-20mA signals that need to be transmitted to the control room. The instruments are located 1000 meters away from the control room, and there is concern regarding signal attenuation. Is there any way to address this issue?
Set up a relay cabinet, or convert it to digital signals using fiber optics?
Or consider using a control cable with a thicker wire diameter
This post was last edited by xxkhc on 2018-6-1 at 21:35. Transmitting 4-20MA over 1000 meters is not a problem at all (except when a Zener diode is used as a gate). A 1.5 square millimeter copper wire will suffice. The solution is to use it with confidence; what needs to be considered is not the attenuation of the current signal, but rather the issue of interference resistance.
It’s no big deal. If that doesn’t work, add a relay.
I completely agree with the view from Floor 5; the main thing is to address the interference issue properly
Original poster, has your problem been solved?
1 kilometer shouldn’t be a problem.