CNR4_CalculationNotes

Last modified by Michael Sibayan on 2022/05/03 16:48

Sensor Code:	CNR4
Sensor:	CNR4 from Kipp-Zonen (sold by Campbell Scientific)
Measurement:	Global and reflected radiation intensity

Output 1:	Volts	Range 1:	0 to 0.015
Output 2:	Volts	Range 2:	0 to 0.015
Output 3:	Volts	Range 3:	-0.005 to 0.005
Output 4:	Volts	Range 4:	-0.005 to 0.005
Output 5:	Resistance	Range 5:	80 to 130
Output 6:	Incoming shortwave intensity (Watts/m^2) = $\frac{Output1}{ka}*1000000$	Range 6:	0 to 1000
Output 7:	Outgoing shortwave Intensity (Watts/m^2) = $\frac{Output2}{kb}*1000000$	Range 7:	0 to 400
Output 8:	Temperature (K) = $\frac{-a+\sqrt{a^2-4b(1-\frac{Output5}{Ro})}}{2b}+273.15$	Range 8:	220 to 335
Output 9:	Incoming long wave intensity (Watts/m^2) = $\frac{Output3}{kc}1000000 + (5.67 10^{-8} * output8^4)$	Range 9:	-150 to 0
Output 10:	Outgoing long wave intensity (Watts/m^2) = $\frac{Output4}{kc}1000000 + (5.67 10^{-8} * output8^4)$	Range 10:	-25 to 25

ka, kb, kc, and kd are the four calibration coefficients assumed to be in microvolts per W/m^2

Pt-100 RTD has a temperature relation approximated by theCallendar-Van Dusen equation. A =3.908x10^-3; B = -5.8019*10^-7; C = -4.2735*10^-12; Ro = 100; for the DIN standard RTD used in the CNR4.
Temperature formula is only valid for T > 272.15 (K)
A numeric approximation is used for T < 272.15 (K)

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Created by Michael Sibayan on 2022/05/03 16:48