On p, 2611 of "Lessons In Industrial Instrumentation" by Kuphaldt...
It says, "In normal operation, the 4-20 mA field instrument possesses insufficient terminal voltage and
insufficient loop current to pose any threat of hazardous atmosphere ignition. However, the normally
modest voltage and current values within a healthy 4-20 mA loop circuit are enough for that circuit
to be considered intrinsically safe."
It seems to me it should say, "are not enough for that circuit to be considered intrinsically safe."
(Apologies if this is the wrong forum to post this, there was a link in the Kuphaldt PDF that lead here to report).
It says, "In normal operation, the 4-20 mA field instrument possesses insufficient terminal voltage and
insufficient loop current to pose any threat of hazardous atmosphere ignition. However, the normally
modest voltage and current values within a healthy 4-20 mA loop circuit are enough for that circuit
to be considered intrinsically safe."
It seems to me it should say, "are not enough for that circuit to be considered intrinsically safe."
(Apologies if this is the wrong forum to post this, there was a link in the Kuphaldt PDF that lead here to report).