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Why you are using 4-20mA instead of using 0-20mA?
4-20mA is used because in that way we can distinguish a ZERO value signal from a malfunction in the measuring circuit (i.e. disconnected cable).
Explain why modern system use 4-20ma standard?
24
How do you calibrate PSIA transmitter. use 14.7 and the range is ATM to 600 PSIA. What would the 4-20mA set points be.?
The difference between Absolute Presure and Gauge Pressure is 14.7psi. So zero gauge pressure (0psig) = 14.7 psia. 600 psig = 614.7 psia. Calibrate the tranmitter so 4mA is obtained at 14.7 psig and 20mA is obtained at 614.7psig. The span will be 600 psi in both cases.
If the range 0-100 what is the square root and linear output in 4-20mA?
% / Sqrt output mA / Non square output mA 0% / 4 / 4 10% / 9.059644256 / 5.6 20% / 11.15541753 / 7.2 25% / 12 / 8 30% / 12.76356092 / 8.8 40% / 14.11928851 / 10.4 50% / 15.3137085 / 12 60% / 16.39354671 / 13.6 70% / 17.38656042 / 15.2 75% / 17.85640646 / 16 80% / 18.31083506 / 16.8 90% / 19.17893277 / 18.4 100% / 20 / 20
How do you use four fours to make 25?
One way to use four fours to make 25 is 4 + 4 + 4 + √4, which equals 25.
